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Ferdous T, Ferdouse S, Hossain MS, Sohidullah M, Marma YNF, Nath SK, Biswas PK. Prevalence of Escherichia coli isolated from oropharynx and trachea of clinically sick poultry and antimicrobial resistance pattern of the strains isolated. Biochem Biophys Rep 2023; 36:101555. [PMID: 37881408 PMCID: PMC10594550 DOI: 10.1016/j.bbrep.2023.101555] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2023] [Revised: 10/06/2023] [Accepted: 10/07/2023] [Indexed: 10/27/2023] Open
Abstract
The study was carried out to investigate the isolation of Escherichia coli from tracheal and oropharyngeal swab of clinically sick chickens. The antibiotic susceptibility patterns of the isolates to several antimicrobials were determined with a striking emphasis on oxytetracycline. The PCR technique was applied to detect tetA, tetB, and tetC in the tetracycline-resistant isolates. The isolates were initially screened for their resistance patterns against 6 antimicrobials of six different groups using the disc diffusion technique. The results showed that 41% tracheal, 51% oropharyngeal, and 34% samples from both sites were E. coli positive respectively. Antimicrobial resistance profiling of the isolates revealed that all the isolates were resistant to oxytetracycline and sulphamethoxazole-trimethoprim, and also 90 %, 82.9%, 63.4%, and 39% resistant to ciprofloxacin, amoxicillin, gentamicin, and colistin respectively. Notably, 82.9% isolates (95% CI 68.4%-91.8%) showed resistance to ≥3 groups of antimicrobials that means these were multi-drug resistant. Among the tetracycline-resistant isolates, 85.4% (95% CI 71.2%-93.5%), 29.3% (7.5%-44.6%), and 7.3% (1.8% - 20.1) were positive for tetA, tetB, and tetC genes respectively. The frequency of the isolation of E. coli is greater in oropharyngeal than tracheal and both kinds of samples. Commercial poultry with E. coli strains has acquired extensive resistance to oxytetracycline. This study suggests a possible association between the tetA gene and oxytetracycline resistance in E. coli isolates, but further investigations like knockdown, whole-genome sequencing, and rescue experiments are needed to establish a direct causal relationship.
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Affiliation(s)
- Tanima Ferdous
- Department of Microbiology and Veterinary Public Health, Faculty of Veterinary Medicine, Chattogram Veterinary and Animal Sciences University, Khulshi, 4225, Chattogram, Bangladesh
| | - Shaolin Ferdouse
- Department of Animal Nutrition, Faculty of Veterinary, Animal and Biomedical Sciences, Khulna Agricultural University, Khulna, 9100, Bangladesh
| | - Md. Shahadat Hossain
- Upazilla Livestock Office and Veterinary Hospital, Dighalia, 9220, Khulna, Bangladesh
| | - M. Sohidullah
- Department of Microbiology and Public Health, Faculty of Veterinary, Animal and Biomedical Sciences, Khulna Agricultural University, Khulna, 9100, Bangladesh
| | - Yaing Nue Frue Marma
- Livestock Extension Officer, Upazilla Livestock Office and Veterinary Hospital, Lohagara, 4396, Chattogram, Bangladesh
| | - Sabuj Kanti Nath
- Department of Animal Nutrition, Faculty of Veterinary, Animal and Biomedical Sciences, Khulna Agricultural University, Khulna, 9100, Bangladesh
| | - Paritosh Kumar Biswas
- Department of Microbiology and Veterinary Public Health, Faculty of Veterinary Medicine, Chattogram Veterinary and Animal Sciences University, Khulshi, 4225, Chattogram, Bangladesh
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Ganguli S, Howlader S, Dey K, Barua S, Islam MN, Begum A, Sobahan MA, Chakraborty RR, Hawlader MDH, Biswas PK. Association of food habit with the COVID-19 severity and hospitalization: A cross-sectional study among the recovered individuals in Bangladesh. Nutr Health 2022; 28:771-782. [PMID: 36066026 DOI: 10.1177/02601060221124068] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Background: It was assumed that dietary habits might influence the status of COVID-19 patients. Aim: We aimed at the identification of association of dietary habits with the COVID-19 severity and hospitalization. Methods: It was a retrospective cross-sectional study (n = 1025). We used bivariate and multivariate analyses to correlate the association between self-reported dietary patterns and COVID-19 severity and hospitalization. Results: Dietary habits (black tea, milked tea, pickles, black caraway seeds, honey, fish, fruits, vegetables, garlic, onion and turmeric) were identified with lower risk of COVID-19 severity and hospitalization. Interestingly, the consumption frequency (one-, two- or three-times/day) of rice - the staple food in Bangladesh - was not associated with COVID-19 severity and hospitalization for comorbid patients. In contrast, a moderate rice-eating habit (two times/day) was strongly associated with the lower risk of severity and hospitalization for non-comorbid patients. However, for both comorbid and non-comorbid patients, consumption of black tea, milked tea, pickles and honey were associated with a lower likelihood of severity and hospitalization. Overall, a high consumption (three-times/day) of fish, fruits and vegetables, a moderate consumption of garlic, onion and turmeric spices and a daily intake of black/milked tea, and honey were associated with reduced risk of COVID-19 severity and hospitalization. Conclusions: To reduce the severity of COVID-19, a habitual practice of intaking black tea, milked tea, black caraway seeds and honey along with dietary habit (rice, fish and vegetables) and with a moderate consumption of ginger, garlic, onion, mixed aromatic spices (cinnamon + cardamom + cloves) and turmeric might be suggested.
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Affiliation(s)
- Sumon Ganguli
- Biomaterials Research Laboratory, Department of Applied Chemistry and Chemical Engineering, Faculty of Science, 54493University of Chittagong, Chattogram, Bangladesh.,Department of Applied Chemistry and Chemical Engineering, Faculty of Science, 54493University of Chittagong, Chattogram, Bangladesh
| | - Sabbir Howlader
- Department of Applied Chemistry and Chemical Engineering, Faculty of Science, 54493University of Chittagong, Chattogram, Bangladesh
| | - Kamol Dey
- Department of Applied Chemistry and Chemical Engineering, Faculty of Science, 54493University of Chittagong, Chattogram, Bangladesh
| | - Suman Barua
- Department of Applied Chemistry and Chemical Engineering, Faculty of Science, 54493University of Chittagong, Chattogram, Bangladesh
| | - Md Nazrul Islam
- Department of Applied Chemistry and Chemical Engineering, Faculty of Science, 54493University of Chittagong, Chattogram, Bangladesh.,School of Pharmacy, The University of Queensland, Queensland, Australia
| | - Afroza Begum
- Department of Statistics, 54493University of Chittagong, Chattogram, Bangladesh
| | - Md Abdus Sobahan
- Department of Applied Chemistry and Chemical Engineering, Faculty of Science, 54493University of Chittagong, Chattogram, Bangladesh
| | - Rivu Raj Chakraborty
- Department of Surgery, Rangamati Medical College and Hospital, Rangamati, Bangladesh
| | | | - Paritosh Kumar Biswas
- Department of Microbiology and Veterinary Public Health, Chattogram Veterinary and Animal Sciences University, Chattogram, Bangladesh
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Al Sattar A, Irin N, Belgrad JP, Haider N, Chisty NN, Mohsin MAS, Foysal M, Das T, Uddin MH, Hasan RB, Ferdous J, Hasan M, Mahmud R, Samad MA, Giasuddin M, Biswas PK, Pfeiffer DU, Debnath NC, Fournié G, Tomley FM, Hoque MA. Measures, Gaps, and Mitigation Strategies in Bangladesh's COVID-19 Response. Ecohealth 2022; 19:378-389. [PMID: 35948736 PMCID: PMC9365222 DOI: 10.1007/s10393-022-01607-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/10/2020] [Accepted: 06/02/2022] [Indexed: 06/15/2023]
Abstract
The Coronavirus Disease 2019 (COVID-19) spread rapidly from China to most other countries around the world in early 2020 killing millions of people. To prevent virus spread, world governments implemented a variety of response measures. This paper's objectives were to discuss the country's adopted measures to combat the virus through June 2020, identify gaps in the measures' effectiveness, and offer possible mitigations to those gaps. The measures taken included screening device deployment across international air and land ports, flight suspensions and closures from COVID-19 affected countries, and declaration and extension of a national public holiday (equivalent to lockdowns in other countries). Identified gaps were test kit, PPE, ICU beds, and ventilator shortages, limited public awareness, and insufficient coordination and collaboration among national and international partners. Proper and timely risk mapping, preparedness, communication, coordination, and collaboration among governments and organizations, and public awareness and engagement would have provided sufficient COVID-19 mitigation in Bangladesh.
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Affiliation(s)
- Abdullah Al Sattar
- Chattogram Veterinary and Animal Sciences University, Zakir Hossain Road, Khulshi, Chattogram, 4225, Bangladesh
| | - Nusrat Irin
- Chattogram Veterinary and Animal Sciences University, Zakir Hossain Road, Khulshi, Chattogram, 4225, Bangladesh
| | - Joseph P Belgrad
- Tufts Cummings School of Veterinary Medicine, 200 Westboro Rd, North Grafton, MA, 01536, USA
| | - Najmul Haider
- The Royal Veterinary College, University of London, Hawkshead Lane, North Mymms, Hatfield, Hertfordshire, UK
| | - Nurun Nahar Chisty
- Chattogram Veterinary and Animal Sciences University, Zakir Hossain Road, Khulshi, Chattogram, 4225, Bangladesh
| | - Md Abu Shoieb Mohsin
- Chattogram Veterinary and Animal Sciences University, Zakir Hossain Road, Khulshi, Chattogram, 4225, Bangladesh
| | - Mohammad Foysal
- Chattogram Veterinary and Animal Sciences University, Zakir Hossain Road, Khulshi, Chattogram, 4225, Bangladesh
| | - Tridip Das
- Chattogram Veterinary and Animal Sciences University, Zakir Hossain Road, Khulshi, Chattogram, 4225, Bangladesh
| | - Md Helal Uddin
- Chattogram Veterinary and Animal Sciences University, Zakir Hossain Road, Khulshi, Chattogram, 4225, Bangladesh
| | - Rubyath Binte Hasan
- Chattogram Veterinary and Animal Sciences University, Zakir Hossain Road, Khulshi, Chattogram, 4225, Bangladesh
| | - Jinnat Ferdous
- Chattogram Veterinary and Animal Sciences University, Zakir Hossain Road, Khulshi, Chattogram, 4225, Bangladesh
| | - Mahmudul Hasan
- Bangladesh Livestock Research Institute, Dhaka, Bangladesh
| | - Rashed Mahmud
- Chattogram Veterinary and Animal Sciences University, Zakir Hossain Road, Khulshi, Chattogram, 4225, Bangladesh
| | | | | | - Paritosh Kumar Biswas
- Chattogram Veterinary and Animal Sciences University, Zakir Hossain Road, Khulshi, Chattogram, 4225, Bangladesh
| | | | - Nitish Chandra Debnath
- Chattogram Veterinary and Animal Sciences University, Zakir Hossain Road, Khulshi, Chattogram, 4225, Bangladesh
| | - Guillaume Fournié
- The Royal Veterinary College, University of London, Hawkshead Lane, North Mymms, Hatfield, Hertfordshire, UK.
| | - Fiona M Tomley
- The Royal Veterinary College, University of London, Hawkshead Lane, North Mymms, Hatfield, Hertfordshire, UK
| | - Md Ahasanul Hoque
- Chattogram Veterinary and Animal Sciences University, Zakir Hossain Road, Khulshi, Chattogram, 4225, Bangladesh.
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Howladeer SS, Gupta SD, Momen A, Rahman MH, Biswas PK, Sarkar SR, Rahman KS, Chanda PK, Ahmed F. Early Impact of Cardiopulmonary Bypass on Renal Function after Valve Replacement Surgery. Mymensingh Med J 2022; 31:711-718. [PMID: 35780355] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Renal dysfunction following cardiopulmonary bypass is well recognized. The pathophysiology of renal injury is multifactorial and culmination of the interplay of several pathophysiological mechanism. Cardiac surgery requiring cardiopulmonary bypass (CPB) is being carried out on an extended patient population of different age groups and undergoing complex surgical procedure, and thus it places them at an increased risk of renal impairment. Valve replacement surgery is a major and complex surgical procedure requiring CPB. This study was therefore designed to observe the impact of CPB and short term outcome on patients with reduced estimated Glomerular Filtration Rate (eGFR) (60-89ml/min/1.73m²) after valve replacement surgery. This cross-sectional study was conducted in the Department of Cardiac Surgery, National Institute of Cardio Vascular Diseases (NICVD) during the period of January 2015 to August 2016. After fulfillment of enrollment criteria 100 patients were studied for the purpose of the study and they were grouped in two, patients with normal eGFR (≥90ml/min/1.73m²) in Group A and patients with reduced eGFR (60-89ml/min/1.73m²) in Group B. A total of 100 patients, 50 in each group were studied for renal function alteration after valve replacement surgery under cardiopulmonary bypass. The incidence of Acute Kidney Injury (AKI) was higher in Group B. Chi-square test was done and p value was 0.011 which is statistically significant. Postoperative blood loss (ml/hr) (p=0.038), duration of Intensive Care Unit (ICU) stay (in hours) (p=0.009), postoperative hospital stay (days) (p=0.014) was significantly higher and postoperative Urine Output (ml/hr) (p=0.001) was significantly lower in patients with reduced eGFR (60-89ml/min/1.73m²) in Group B. Deterioration of renal function is more in patient with eGFR (60-89ml/min/1.73m²) after valve replacement surgery under cardiopulmonary bypass in comparison with patients with eGFR (≥90ml/min/1.73m²).
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Affiliation(s)
- S S Howladeer
- Dr Siddhartha Shankar Howlader, Senior Specialist, Department of Cardiothoracic and Vascular Surgery, Evercare Hospital Chattogram, Bangladesh; E-mail:
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Arh T, Sana B, Pregelj M, Khuntia P, Jagličić Z, Le MD, Biswas PK, Manuel P, Mangin-Thro L, Ozarowski A, Zorko A. The Ising triangular-lattice antiferromagnet neodymium heptatantalate as a quantum spin liquid candidate. Nat Mater 2022; 21:416-422. [PMID: 34969994 DOI: 10.1038/s41563-021-01169-y] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/23/2020] [Accepted: 11/11/2021] [Indexed: 06/14/2023]
Abstract
Disordered magnetic states known as spin liquids are of paramount importance in both fundamental and applied science. A classical state of this kind was predicted for the Ising antiferromagnetic triangular model, while additional non-commuting exchange terms were proposed to induce its quantum version-a quantum spin liquid. However, these predictions have not yet been confirmed experimentally. Here, we report evidence for such a state in the triangular-lattice antiferromagnet NdTa7O19. We determine its magnetic ground state, which is characterized by effective spin-1/2 degrees of freedom with Ising-like nearest-neighbour correlations and gives rise to spin excitations persisting down to the lowest accessible temperature of 40 mK. Our study demonstrates the key role of strong spin-orbit coupling in stabilizing spin liquids that result from magnetic anisotropy and highlights the large family of rare-earth (RE) heptatantalates RETa7O19 as a framework for realization of these states, which represent a promising platform for quantum applications.
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Affiliation(s)
- T Arh
- Jožef Stefan Institute, Ljubljana, Slovenia
- Faculty of Mathematics and Physics, University of Ljubljana, Ljubljana, Slovenia
| | - B Sana
- Department of Physics, Indian Institute of Technology Madras, Chennai, India
| | - M Pregelj
- Jožef Stefan Institute, Ljubljana, Slovenia
| | - P Khuntia
- Department of Physics, Indian Institute of Technology Madras, Chennai, India
- Quantum Centre for Diamond and Emergent Materials, Indian Institute of Technology Madras, Chennai, India
- Functional Oxide Research Group, Indian Institute of Technology Madras, Chennai, India
| | - Z Jagličić
- Faculty of Civil and Geodetic Engineering, University of Ljubljana, Ljubljana, Slovenia
- Institute of Mathematics, Physics and Mechanics, Ljubljana, Slovenia
| | - M D Le
- ISIS facility, Rutherford Appleton Laboratory, Didcot, UK
| | - P K Biswas
- ISIS facility, Rutherford Appleton Laboratory, Didcot, UK
| | - P Manuel
- ISIS facility, Rutherford Appleton Laboratory, Didcot, UK
| | | | - A Ozarowski
- National High Magnetic Field Laboratory, Florida State University, Tallahassee, FL, USA
| | - A Zorko
- Jožef Stefan Institute, Ljubljana, Slovenia.
- Faculty of Mathematics and Physics, University of Ljubljana, Ljubljana, Slovenia.
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Das T, Rana EA, Dutta A, Bostami MB, Rahman M, Deb P, Nath C, Barua H, Biswas PK. Antimicrobial resistance profiling and burden of resistance genes in zoonotic Salmonella isolated from broiler chicken. Vet Med Sci 2022; 8:237-244. [PMID: 34599790 PMCID: PMC8788989 DOI: 10.1002/vms3.648] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
BACKGROUND Salmonella is frequently found in poultry of which only motile serovars have zoonotic significance due to their potential to induce human gastrointestinal infections. Antimicrobial resistance, being a public health concern, the emergence of multidrug-resistant (MDR) Salmonella serotypes affecting food chain has greater impact worldwide. AIM Information on circulation of zoonotic Salmonella strains in commercial poultry farm level is limited in many parts of the world. This cross-sectional study was aimed to investigate the zoonotic Salmonella strains circulating in the broiler farm environment with their detailed antimicrobial resistance profiling. METHODS Pooled faecal samples were collected randomly from commercial broiler farms of Chattogram district, Bangladesh. Standard bacteriological procedure was followed to isolate Salmonella, and identification was confirmed by genus specific polymerase chain reaction (PCR). After phenotypic characterisation of resistance profile against eight antimicrobials by disc diffusion technique, all strains were screened by PCR for some selected resistance genes. RESULTS: Out of the 350 samples, Salmonella was isolated and identified from 86 samples. In antimicrobial sensitivity testing, more than 98.8% isolates showed resistance to ampicillin and 94.2% to tetracycline followed by enrofloxacin (56%) and ciprofloxacin (50%). Notably, 94% isolates were found to be MDR. The results of PCR assays revealed that 81.4% of the isolates were carrying the tetA gene, 19.8% the tetB and 10.47% the tetC gene. The prevalence of the isolates bearing the blaTEM , blaCTX-M and Sul-I gene were 95.4%, 7.0 % and 37.2 %, respectively. CONCLUSION There is a great risk to secure healthy poultry products due to the circulation of these MDR zoonotic Salmonella.
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Affiliation(s)
- Tridip Das
- Department of Microbiology and Veterinary Public Health, Chattogram Veterinary and Animal Sciences University, Khulshi, Chattogram, Bangladesh
- Poultry Research and Training Centre, Chattogram Veterinary and Animal Sciences University, Khulshi, Chattogram, Bangladesh
| | - Eaftekhar Ahmed Rana
- Department of Microbiology and Veterinary Public Health, Chattogram Veterinary and Animal Sciences University, Khulshi, Chattogram, Bangladesh
| | - Avijit Dutta
- Department of Microbiology and Veterinary Public Health, Chattogram Veterinary and Animal Sciences University, Khulshi, Chattogram, Bangladesh
| | - Md Bayazid Bostami
- Teaching and Training Pet Hospital and Research Centre, Chattogram Veterinary and Animal Sciences University, Bangladesh
| | - Mizanur Rahman
- Teaching and Training Pet Hospital and Research Centre, Chattogram Veterinary and Animal Sciences University, Bangladesh
| | - Probir Deb
- Department of Microbiology and Veterinary Public Health, Chattogram Veterinary and Animal Sciences University, Khulshi, Chattogram, Bangladesh
| | - Chandan Nath
- Department of Microbiology and Veterinary Public Health, Chattogram Veterinary and Animal Sciences University, Khulshi, Chattogram, Bangladesh
| | - Himel Barua
- Department of Microbiology and Veterinary Public Health, Chattogram Veterinary and Animal Sciences University, Khulshi, Chattogram, Bangladesh
| | - Paritosh Kumar Biswas
- Department of Microbiology and Veterinary Public Health, Chattogram Veterinary and Animal Sciences University, Khulshi, Chattogram, Bangladesh
- Poultry Research and Training Centre, Chattogram Veterinary and Animal Sciences University, Khulshi, Chattogram, Bangladesh
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Ganguli S, Howlader S, Dey K, Barua S, Islam MN, Aquib TI, Partho PB, Chakraborty RR, Barua B, Hawlader MDH, Biswas PK. Association of comorbidities with the COVID-19 severity and hospitalization: A study among the recovered individuals in Bangladesh. Int J Health Sci (Qassim) 2022; 16:30-45. [PMID: 35949693 PMCID: PMC9288138] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
Abstract
Objectives We aimed at the identification of the association of comorbidities with the COVID-19 severity and hospitalization. Methods It is a retrospective cross-sectional study to investigate the variation in age, sex, dwelling, comorbidities, and medication with the COVID-19 severity and hospitalization by enrolling 1025 recovered individuals while comparing their time of recovery with or without comorbidities. Results COVID-19 patients mostly suffered from fever. The predominant underlying medical conditions in them were hypertension (HTN) followed by diabetes mellitus (DM). Patients with cardiovascular disease (CVD) (54.3%) and hepatic disorders (HD) (43.6%) experienced higher severity. The risk of symptomatic cases was higher in aged (odds ratio, OR = 1.04, 95% CI = 1.02-1.06) and comorbid (OR = 1.87, 95% CI = 1.34-2.60) patients. T-test confirmed the differences between the comorbid and non-comorbid patients' recovery duration. The presence of multiple comorbidities increased the time of recovery (15-27 days) and hospitalization (20-40%). Increased symptomatic cases were found for patients having DM+HTN whereas CVD+Asthma patients were found with higher percentage of severity. Besides, DM+CKD (chronic kidney disease) was associated with higher hospitalization rate. Higher odds of severity were found for DM+CVD (OR = 4.42, 95% CI = 1.81-10.78) patients. Hospitalization risk was also increased for them (OR = 5.14, 95% CI = 2.02-13.07). Moreover, if they had HTN along with DM+CVD, they were found with even higher odds (OR = 6.82, 95% CI = 2.37-19.58) for hospitalization. Conclusion Our study indicates that people who are aged, females, living in urban area and have comorbid conditions are at a higher risk for developing COVID-19 severity. Clinicians and health management authorities should prioritize these high-risk groups to reduce mortality attributed to the disease.
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Affiliation(s)
- Sumon Ganguli
- Department of Applied Chemistry and Chemical Engineering, Faculty of Science, University of Chittagong, Chattogram-4331, Bangladesh,Address for correspondence: Sumon Ganguli, Biomaterials Research Laboratory, Department of Applied Chemistry and Chemical Engineering, Faculty of Science, University of Chittagong, Chattogram-4331, Bangladesh. E-mail:
| | - Sabbir Howlader
- Department of Applied Chemistry and Chemical Engineering, Faculty of Science, University of Chittagong, Chattogram-4331, Bangladesh
| | - Kamol Dey
- Department of Applied Chemistry and Chemical Engineering, Faculty of Science, University of Chittagong, Chattogram-4331, Bangladesh
| | - Suman Barua
- Department of Applied Chemistry and Chemical Engineering, Faculty of Science, University of Chittagong, Chattogram-4331, Bangladesh
| | - Md. Nazrul Islam
- Department of Applied Chemistry and Chemical Engineering, Faculty of Science, University of Chittagong, Chattogram-4331, Bangladesh,School of Pharmacy, The University of Queensland, Queensland, Australia
| | - Tahmidul Islam Aquib
- Department of Applied Chemistry and Chemical Engineering, Faculty of Science, University of Chittagong, Chattogram-4331, Bangladesh
| | - Prosenjit Biswas Partho
- Senior Medical Officer, Health Department, Ministry of Health and Family Welfare, Bangladesh
| | | | - Bidduth Barua
- Deputy Director, Chittagong Medical University, Chattogram, Bangladesh
| | | | - Paritosh Kumar Biswas
- Department of Microbiology and Veterinary Public Health, Chattogram Veterinary and Animal Sciences University, Khulshi, Chattogram, Bangladesh
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Rana EA, Islam MZ, Das T, Dutta A, Ahad A, Biswas PK, Barua H. Prevalence of coagulase-positive methicillin-resistant Staphylococcus aureus and Staphylococcus pseudintermedius in dogs in Bangladesh. Vet Med Sci 2021; 8:498-508. [PMID: 34941011 PMCID: PMC8959323 DOI: 10.1002/vms3.701] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/04/2022] Open
Abstract
Background The emergence of methicillin‐resistant Staphylococcus aureus (MRSA) and methicillin‐resistant Staphylococcus pseudintermedius (MRSP) have a significant health impact on people with direct or supportive occupations in veterinary medicine including veterinarians, animal handlers, laboratory personnel and pet owners. Objectives This cross‐sectional survey was conducted to determine the prevalence of and risk factors for S. aureus, S. pseudintermedius, MRSA and MRSP in dogs in Bangladesh. Methods A total of 358 swab samples were collected from different body sites of 150 dogs attending a university teaching veterinary hospital between January and June 2018. Standard bacteriological procedures were followed to isolate Staphylococcus, and identification was confirmed to the species level by PCR to detect the nuc gene. MRSA and MRSP were confirmed by the presence of the mecA gene. Results The prevalence of coagulase‐positive S. aureus and S. pseudintermedius in dogs were 16% and 45.3%, respectively. S. aureus and S. pseudintermedius isolates displayed the highest resistance against nalidixic acid (95.2% and 91%, respectively) and erythromycin (89.3% and 84.7%, respectively). Notably, all the staphylococcal isolates showed resistance to ≥3 antimicrobial classes. The prevalence of MRSA and MRSP in dogs was 8.7% and 6%, respectively. Multivariable logistic regression analysis identified the following variables as risk factors for MRSA colonisation in dogs: dogs with dermatitis (odds ratio [OR], 12.24, 95% CI: 3.12–57.33; p < 0.001) and history of antibiotic use (OR 8.73, 95% CI: 2.23–43.10; p < 0.001). Presence of otitis (OR 14.22; 95% CI: 1.64–103.58; p = 0.008) and oral lesions (OR 9.48, 95% CI: 1.14–64.82; p = 0.002) were identified as the significant risk factors for the carriage of MRSP. Conclusions The circulation of multidrug‐resistant S. aureus and S. pseudintermedius is a serious concern to dogs and humans. To our knowledge, this is the first report of S. pseudintermedius and MRSP affecting dogs in Bangladesh.
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Affiliation(s)
- Eaftekhar Ahmed Rana
- Department of Microbiology and Veterinary Public Health, Chattogram Veterinary and Animal Sciences University, Khulshi, Chattogram, Bangladesh
| | - Md Zohorul Islam
- Department of Microbiology and Veterinary Public Health, Chattogram Veterinary and Animal Sciences University, Khulshi, Chattogram, Bangladesh
| | - Tridip Das
- Department of Microbiology and Veterinary Public Health, Chattogram Veterinary and Animal Sciences University, Khulshi, Chattogram, Bangladesh
| | - Avijit Dutta
- Department of Microbiology and Veterinary Public Health, Chattogram Veterinary and Animal Sciences University, Khulshi, Chattogram, Bangladesh
| | - Abdul Ahad
- Department of Microbiology and Veterinary Public Health, Chattogram Veterinary and Animal Sciences University, Khulshi, Chattogram, Bangladesh
| | - Paritosh Kumar Biswas
- Department of Microbiology and Veterinary Public Health, Chattogram Veterinary and Animal Sciences University, Khulshi, Chattogram, Bangladesh
| | - Himel Barua
- Department of Microbiology and Veterinary Public Health, Chattogram Veterinary and Animal Sciences University, Khulshi, Chattogram, Bangladesh
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Ripa RN, Sealy JE, Raghwani J, Das T, Barua H, Masuduzzaman M, Saifuddin A, Huq MR, Uddin MI, Iqbal M, Brown I, Lewis NS, Pfeiffer D, Fournie G, Biswas PK. Molecular epidemiology and pathogenicity of H5N1 and H9N2 avian influenza viruses in clinically affected chickens on farms in Bangladesh. Emerg Microbes Infect 2021; 10:2223-2234. [PMID: 34753400 PMCID: PMC8635652 DOI: 10.1080/22221751.2021.2004865] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
Avian influenza virus (AIV) subtypes H5N1 and H9N2 co-circulate in poultry in Bangladesh, causing significant bird morbidity and mortality. Despite their importance to the poultry value chain, the role of farms in spreading and maintaining AIV infections remains poorly understood in most disease-endemic settings. To address this crucial gap in our knowledge, we conducted a cross-sectional study between 2017 and 2019 in the Chattogram Division of Bangladesh in clinically affected and dead chickens in farms with suspected AIV infection. Viral prevalence of each subtype was approximately 10% among farms for which veterinary advice was sought, indicating a high level of virus circulation in chicken farms despite the low number of reported outbreaks. The level of co-circulation of both subtypes on farms was high, with our study suggesting that in the field, the co-circulation of H5N1 and H9N2 can modulate disease severity, which could facilitate an underestimated level of AIV transmission in the poultry value chain. Finally, using newly generated whole-genome sequences, we investigate the evolutionary history of a small subset of H5N1 and H9N2 viruses. Our analyses revealed that for both subtypes, the sampled viruses were genetically most closely related to other viruses isolated in Bangladesh and represented multiple independent incursions. However, due to lack of longitudinal surveillance in this region, it is difficult to ascertain whether these viruses emerged from endemic strains circulating in Bangladesh or from neighbouring countries. We also show that amino acids at putative antigenic residues underwent a distinct replacement during 2012 which coincides with the use of H5N1 vaccines.
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Affiliation(s)
- Ripatun Nahar Ripa
- Department of Microbiology and Veterinary Public Health, Chattogram Veterinary and Animal Sciences University, Chattogram, Bangladesh
| | - Joshua E Sealy
- Avian influenza viruses group, the Pirbright institute, Ash road, Pirbright, Woking, GU24 0NF, United Kingdom
| | | | - Tridip Das
- Poultry Research and Training Centre, Chattogram Veterinary and Animal Sciences University, Chattogram, Bangladesh
| | - Himel Barua
- Department of Microbiology and Veterinary Public Health, Chattogram Veterinary and Animal Sciences University, Chattogram, Bangladesh
| | - Md Masuduzzaman
- Department of Pathology and Parasitology, Chattogram Veterinary and Animal Sciences University, Chattogram, Bangladesh
| | - Akm Saifuddin
- Department of Physiology, Biochemistry and Pharmacology, Chattogram Veterinary and Animal Sciences University, Chattogram, Bangladesh
| | - Md Reajul Huq
- District Livestock Office, Chattogram, Department of Livestock Services, Bangladesh
| | - Mohammad Inkeyas Uddin
- Poultry Research and Training Centre, Chattogram Veterinary and Animal Sciences University, Chattogram, Bangladesh
| | - Munir Iqbal
- Avian influenza viruses group, the Pirbright institute, Ash road, Pirbright, Woking, GU24 0NF, United Kingdom
| | - Ian Brown
- Animal and Plant Health Agency-Weybridge, Woodham lane, Addlestone, KT15 3NB, United Kingdom
| | - Nicola S Lewis
- The Royal Veterinary College, Hawkshead lane, Brookmans park, Hatfield, AL9 7TA, United Kingdom.,Animal and Plant Health Agency-Weybridge, Woodham lane, Addlestone, KT15 3NB, United Kingdom
| | - Dirk Pfeiffer
- Jockey Club College of Veterinary Medicine and Life Sciences, City University of Hong Kong, China
| | - Guillaume Fournie
- The Royal Veterinary College, Hawkshead lane, Brookmans park, Hatfield, AL9 7TA, United Kingdom
| | - Paritosh Kumar Biswas
- Department of Microbiology and Veterinary Public Health, Chattogram Veterinary and Animal Sciences University, Chattogram, Bangladesh
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10
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Zamil S, Ferdous J, Zannat MM, Biswas PK, Gibson JS, Henning J, Hoque MA, Barua H. Isolation and antimicrobial resistance of motile Salmonella enterica from the poultry hatchery environment. Vet Res Commun 2021; 45:277-284. [PMID: 34189702 DOI: 10.1007/s11259-021-09807-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2021] [Accepted: 06/20/2021] [Indexed: 10/21/2022]
Abstract
Salmonella is a globally distributed major food-borne pathogen and poultry is one of the predominant sources of salmonellosis in humans. To investigate the presence of motile Salmonella in the poultry hatchery environment, we collected 97 fluff samples from four selected broiler breeder chicken hatcheries from Chattogram, Bangladesh during July-December 2015. To isolate motile Salmonella enterica, we used conventional bacteriological techniques followed by serological verification using anti-Salmonella Poly A-E serum and species confirmation by conventional PCR assay. Antimicrobial susceptibility testing by Kirby-Bauer disc diffusion method for 10 commonly used antibiotics was performed on all isolates. Isolates displaying phenotypic resistance to ampicillin were tested by PCR for blaTEM gene, whereas those resistant to tetracycline were tested for the presence of tetA, tetB and tetC genes. A total of 24 samples (24.7%; 95% CI: 16.5-34.5, N = 97) from 3 hatcheries were positive for motile Salmonella. Of them, 21 (87.5%) and 12 (50.0%) were resistant to ampicillin and tetracycline, respectively, 9 (37.5%) to nalidixic acid and sulphamethoxazole/trimethoprim. No resistance was detected to ceftriaxone, cefoxitin, gentamicin, neomycin, ciprofloxacin and colistin. Ten (42%) of 24 isolates from 2 hatcheries were multi-drug resistant (i.e. resistant to ≥ 3 antimicrobial classes). Six of 21 ampicillin resistant isolates contained blaTEM gene and 10 of 12 tetracycline resistant isolates contained tetA gene. This study highlights the circulation of multi-drug resistant motile Salmonella in the hatchery environment for the first time in Bangladesh. Further epidemiological and molecular studies are therefore needed to identify the serotypes and source of the bacteria in hatcheries.
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Affiliation(s)
- Shafayat Zamil
- Faculty of Veterinary Medicine, Chattogram Veterinary and Animal Sciences University, Zakir Hossain Road, Khulshi, Chattogram, 4225, Bangladesh.
| | - Jinnat Ferdous
- Faculty of Veterinary Medicine, Chattogram Veterinary and Animal Sciences University, Zakir Hossain Road, Khulshi, Chattogram, 4225, Bangladesh.,EcoHealth Alliance, New York, NY, 10001-2320, USA.,Institute of Epidemiology, Disease Control and Research (IEDCR), Mohakhali, Dhaka, 1212, Bangladesh
| | - Mosammat Moonkiratul Zannat
- Faculty of Veterinary Medicine, Chattogram Veterinary and Animal Sciences University, Zakir Hossain Road, Khulshi, Chattogram, 4225, Bangladesh
| | - Paritosh Kumar Biswas
- Faculty of Veterinary Medicine, Chattogram Veterinary and Animal Sciences University, Zakir Hossain Road, Khulshi, Chattogram, 4225, Bangladesh
| | - Justine S Gibson
- School of Veterinary Science, The University of Queensland, Gatton, Qld, 4343, Australia
| | - Joerg Henning
- School of Veterinary Science, The University of Queensland, Gatton, Qld, 4343, Australia
| | - Md Ahasanul Hoque
- Faculty of Veterinary Medicine, Chattogram Veterinary and Animal Sciences University, Zakir Hossain Road, Khulshi, Chattogram, 4225, Bangladesh
| | - Himel Barua
- Faculty of Veterinary Medicine, Chattogram Veterinary and Animal Sciences University, Zakir Hossain Road, Khulshi, Chattogram, 4225, Bangladesh
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11
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Biswas PK, Ghosh SK, Zhao JZ, Mayoh DA, Zhigadlo ND, Xu X, Baines C, Hillier AD, Balakrishnan G, Lees MR. Chiral singlet superconductivity in the weakly correlated metal LaPt 3P. Nat Commun 2021; 12:2504. [PMID: 33947862 PMCID: PMC8097077 DOI: 10.1038/s41467-021-22807-8] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2020] [Accepted: 03/30/2021] [Indexed: 11/09/2022] Open
Abstract
Chiral superconductors are novel topological materials with finite angular momentum Cooper pairs circulating around a unique chiral axis, thereby spontaneously breaking time-reversal symmetry. They are rather scarce and usually feature triplet pairing: a canonical example is the chiral p-wave state realized in the A-phase of superfluid He3. Chiral triplet superconductors are, however, topologically fragile with the corresponding gapless boundary modes only weakly protected against symmetry-preserving perturbations in contrast to their singlet counterparts. Using muon spin relaxation measurements, here we report that the weakly correlated pnictide compound LaPt3P has the two key features of a chiral superconductor: spontaneous magnetic fields inside the superconducting state indicating broken time-reversal symmetry and low temperature linear behaviour in the superfluid density indicating line nodes in the order parameter. Using symmetry analysis, first principles band structure calculation and mean-field theory, we unambiguously establish that the superconducting ground state of LaPt3P is a chiral d-wave singlet.
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Affiliation(s)
- P K Biswas
- ISIS Pulsed Neutron and Muon Source, STFC Rutherford Appleton Laboratory, Harwell Campus, Didcot, Oxfordshire, UK.
| | - S K Ghosh
- School of Physical Sciences, University of Kent, Canterbury, UK.
| | - J Z Zhao
- Co-Innovation Center for New Energetic Materials, Southwest University of Science and Technology, Mianyang, China
| | - D A Mayoh
- Physics Department, University of Warwick, Coventry, UK
| | - N D Zhigadlo
- Laboratory for Solid State Physics, ETH Zurich, Zurich, Switzerland.,CrystMat Company, Zurich, Switzerland
| | - Xiaofeng Xu
- Department of Applied Physics, Zhejiang University of Technology, Hangzhou, China
| | - C Baines
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, Villigen PSI, Switzerland
| | - A D Hillier
- ISIS Pulsed Neutron and Muon Source, STFC Rutherford Appleton Laboratory, Harwell Campus, Didcot, Oxfordshire, UK
| | | | - M R Lees
- Physics Department, University of Warwick, Coventry, UK
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12
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Hennessey M, Fournié G, Hoque MA, Biswas PK, Alarcon P, Ebata A, Mahmud R, Hasan M, Barnett T. Intensification of fragility: Poultry production and distribution in Bangladesh and its implications for disease risk. Prev Vet Med 2021; 191:105367. [PMID: 33965744 DOI: 10.1016/j.prevetmed.2021.105367] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2020] [Revised: 04/13/2021] [Accepted: 04/23/2021] [Indexed: 12/27/2022]
Abstract
Poultry production is a valuable source of nutritious food and income and is considered a crucial part of global development. This is especially important for countries such as Bangladesh where levels of hunger and childhood stunting remain high. However, in many low- and middle-income countries poultry production remains dominated by small to medium scale enterprises operating with poor farm biosecurity associated with poultry and zoonotic disease risks. We aimed to characterize the structure of poultry production in Bangladesh in order to identify the underlying structural factors and resulting practices which create risk environments for emergence, persistence and transmission of infectious diseases. Using the concept of a production and distribution network (PDN), we conducted a review of the literature, 27 in-depth interviews with key-informants and stakeholders, and 20 structured interviews with poultry distributors to map the ways which poultry are raised, distributed and marketed in Bangladesh. Findings indicate that the PDN can be considered in the context of four major sub-networks, based on the types of chickens; broadly indigenous, cross-bred, exotic broiler, and layer chickens. These sub-networks do not exist in isolation; their transactional nodes - actors and sites - are dynamic and numerous interactions occur within and between the PDN. Our findings suggest that the growth in small and medium scale poultry enterprises is conducted within 'fragile' enterprises by inexperienced and poorly supported producers, many of whom lack capacity for the level of system upgrading needed to mitigate disease risk. Efforts could be taken to address the structural underlying factors identified, such as the poor bargaining power of producers and lack of access to independent credit and indemnity schemes, as a way to reduce the fragility of the PDN and increase its resilience to disease threats. This knowledge on the PDN structure and function provide the essential basis to better study the generation, mitigation and consequences of disease risks associated to livestock, including the analysis of potential hotspots for disease emergence and transmission.
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Affiliation(s)
- Mathew Hennessey
- Veterinary Epidemiology, Economics and Public Health Group, Department of Pathobiology and Population Sciences, Royal Veterinary College, London, UK; Department of Global Health and Development, London School of Hygiene & Tropical Medicine, London, UK.
| | - Guillaume Fournié
- Veterinary Epidemiology, Economics and Public Health Group, Department of Pathobiology and Population Sciences, Royal Veterinary College, London, UK
| | - Md Ahasanul Hoque
- Department of Medicine and Surgery, Faculty of Veterinary Medicine, Chattogram Veterinary and Animal Sciences University, Chattogram, Bangladesh
| | - Paritosh Kumar Biswas
- Department of Microbiology and Veterinary Public Health, Faculty of Veterinary Medicine, Chattogram Veterinary and Animal Sciences University, Chattogram, Bangladesh
| | - Pablo Alarcon
- Veterinary Epidemiology, Economics and Public Health Group, Department of Pathobiology and Population Sciences, Royal Veterinary College, London, UK
| | - Ayako Ebata
- Institute of Development Studies, University of Sussex, Library Road, Falmer, Brighton, UK
| | - Rashed Mahmud
- Department of Medicine and Surgery, Faculty of Veterinary Medicine, Chattogram Veterinary and Animal Sciences University, Chattogram, Bangladesh
| | - Mahmudul Hasan
- Animal Health Research Division, Bangladesh Livestock Research Institute, Savar, Dhaka 1341, Bangladesh
| | - Tony Barnett
- Veterinary Epidemiology, Economics and Public Health Group, Department of Pathobiology and Population Sciences, Royal Veterinary College, London, UK; Department of Global Health and Development, London School of Hygiene & Tropical Medicine, London, UK; Humanitarian Conflict Response Institute, University of Manchester, UK; Firoz Lalji Centre for Africa, London School of Economics and Political Science, London, UK
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13
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Das T, Islam MZ, Rana EA, Dutta A, Ahmed S, Barua H, Biswas PK. Abundance of Mobilized Colistin Resistance Gene ( mcr-1) in Commensal Escherichia coli from Diverse Sources. Microb Drug Resist 2021; 27:1585-1593. [PMID: 33909471 DOI: 10.1089/mdr.2020.0433] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Aims: Antimicrobial resistance (AMR) spreads not only by pathogenic but also by commensal bacteria, and the latter can become a reservoir for resistance genes. This study was aimed to investigate the AMR patterns along with the presence of mobilized colistin resistance (mcr) genes in commensal Escherichia coli circulating in chickens, farm environments, street foods, and human patients. Materials and Methods: By a cross-sectional survey, isolates obtained from 530 samples were tested for their AMR profiles against 9 antimicrobials. Minimum inhibitory concentration (MIC) of the phenotypically colistin-resistant isolates was determined and screened for a set of mcr genes followed by sequencing of mcr-1 gene in the multidrug-resistant (MDR) isolates. Results: A total of 313 E. coli strains were isolated and confirmed by polymerase chain reaction. Antimicrobial susceptibility testing revealed that about 98% (confidence interval [95% CI] 95-99) of the isolates were MDR, and 58% (95% CI 52-63) isolates exhibited resistance to colistin. MIC values of colistin against the isolates ranged from 4 to 64 mg/L. Except for human patients, 20.4% colistin-resistant isolates from other sources of isolation had mcr-1 gene. Conclusions: There is abundance of commensal MDR E. coli strains with the acquisition of mcr-1 gene circulating in chickens and farm environments in Bangladesh.
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Affiliation(s)
- Tridip Das
- Department of Microbiology and Veterinary Public Health, Chattogram Veterinary and Animal Sciences University, Chattogram, Bangladesh.,Poultry Research and Training Centre, Chattogram Veterinary and Animal Sciences University, Chattogram, Bangladesh
| | - Md Zohorul Islam
- Department of Microbiology and Veterinary Public Health, Chattogram Veterinary and Animal Sciences University, Chattogram, Bangladesh
| | - Eaftekhar Ahmed Rana
- Department of Microbiology and Veterinary Public Health, Chattogram Veterinary and Animal Sciences University, Chattogram, Bangladesh
| | - Avijit Dutta
- Department of Microbiology and Veterinary Public Health, Chattogram Veterinary and Animal Sciences University, Chattogram, Bangladesh
| | - Shahana Ahmed
- Department of Microbiology and Veterinary Public Health, Chattogram Veterinary and Animal Sciences University, Chattogram, Bangladesh
| | - Himel Barua
- Department of Microbiology and Veterinary Public Health, Chattogram Veterinary and Animal Sciences University, Chattogram, Bangladesh
| | - Paritosh Kumar Biswas
- Department of Microbiology and Veterinary Public Health, Chattogram Veterinary and Animal Sciences University, Chattogram, Bangladesh.,Poultry Research and Training Centre, Chattogram Veterinary and Animal Sciences University, Chattogram, Bangladesh
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14
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Kundu S, Shahee A, Chakraborty A, Ranjith KM, Koo B, Sichelschmidt J, Telling MTF, Biswas PK, Baenitz M, Dasgupta I, Pujari S, Mahajan AV. Gapless Quantum Spin Liquid in the Triangular System Sr_{3}CuSb_{2}O_{9}. Phys Rev Lett 2020; 125:267202. [PMID: 33449718 DOI: 10.1103/physrevlett.125.267202] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/13/2020] [Accepted: 12/01/2020] [Indexed: 06/12/2023]
Abstract
We report gapless quantum spin liquid behavior in the layered triangular Sr_{3}CuSb_{2}O_{9} system. X-ray diffraction shows superlattice reflections associated with atomic site ordering into triangular Cu planes well separated by Sb planes. Muon spin relaxation measurements show that the S=1/2 moments at the magnetically active Cu sites remain dynamic down to 65 mK in spite of a large antiferromagnetic exchange scale evidenced by a large Curie-Weiss temperature θ_{CW}≃-143 K as extracted from the bulk susceptibility. Specific heat measurements also show no sign of long-range order down to 0.35 K. The magnetic specific heat (C_{m}) below 5 K reveals a C_{m}=γT+αT^{2} behavior. The significant T^{2} contribution to the magnetic specific heat invites a phenomenology in terms of the so-called Dirac spinon excitations with a linear dispersion. From the low-T specific heat data, we estimate the dominant exchange scale to be ∼36 K using a Dirac spin liquid ansatz which is not far from the values inferred from microscopic density functional theory calculations (∼45 K) as well as high-temperature susceptibility analysis (∼70 K). The linear specific heat coefficient is about 18 mJ/mol K^{2} which is somewhat larger than for typical Fermi liquids.
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Affiliation(s)
- S Kundu
- Department of Physics, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
| | - Aga Shahee
- Department of Physics, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
| | - Atasi Chakraborty
- School of Physical Sciences, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India
| | - K M Ranjith
- Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany
| | - B Koo
- Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany
| | - Jörg Sichelschmidt
- Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany
| | - Mark T F Telling
- ISIS Pulsed Neutron and Muon Source, STFC Rutherford Appleton Laboratory, Harwell Campus, Didcot, Oxfordshire OX110QX, United Kingdom
| | - P K Biswas
- ISIS Pulsed Neutron and Muon Source, STFC Rutherford Appleton Laboratory, Harwell Campus, Didcot, Oxfordshire OX110QX, United Kingdom
| | - M Baenitz
- Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany
| | - I Dasgupta
- School of Physical Sciences, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India
| | - Sumiran Pujari
- Department of Physics, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
| | - A V Mahajan
- Department of Physics, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
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15
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Das A, Dhar PK, Dutta A, Jalal MS, Ghosh P, Das T, Barua H, Biswas PK. Circulation of oxytetracycline- and ciprofloxacin-resistant commensal Escherichia coli strains in broiler chickens and farm environments, Bangladesh. Vet World 2020; 13:2395-2400. [PMID: 33363332 PMCID: PMC7750236 DOI: 10.14202/vetworld.2020.2395-2400] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2020] [Accepted: 09/24/2020] [Indexed: 01/08/2023] Open
Abstract
Background and Aim: The emergence of antimicrobial resistance (AMR) in commensal organism, such as Escherichia coli of food animals, is an alarming issue for global health. It increases the possibility of transmitting AMR determinant(s) to human bacterial pathogens by transferable genetic materials, particularly by plasmids. Hence, it is important to know which resistant genes are being carried by commensal organisms in food chain in a country and their level of temporal loads. As a result, pre-emptive measures can be advocated with an aim to reduce their risks in their primary source of circulation which consequently would benefit the public health. Materials and Methods: Commensal E. coli strains from broiler chickens on randomly selected 30 farms and the farm environments were examined for the frequencies of isolation of resistant strains to oxytetracycline and ciprofloxacin. Five birds were randomly selected from each farm to collect cloacal swab samples (total of 150 samples). Furthermore, a total of 150 environmental samples comprising one each from feed, water, soil, litter, and litter damping site of each farm were screened for the isolation of commensal E. coli strains. Strains thus obtained were initially tested for their resistance to oxytetracycline and ciprofloxacin by Kirby–Bauer disk diffusion method. Oxytetracycline-resistant strains were further screened for the presence of resistance determining genes, namely, tetA, tetB, and tetC by uniplex polymerase chain reactions. Risks associated with the isolation frequency of oxytetracycline- and ciprofloxacin-resistant E. coli were also assessed by univariable logistic regression analysis. Results: The results revealed that all E. coli isolates, regardless of the source of origin, were resistant to oxytetracycline, while 78.4% (95% confidence interval [CI] 69.1-85.5%) showed resistance to ciprofloxacin. All the randomly selected (20) oxytetracycline-resistant strains harbored the tetA gene, whereas tetB and tetC were reported in three and two isolates, respectively. After univariable analysis, only one variable, that is, strain 1 of broiler chickens compared to two other strains was found to be positively associated with the isolation of ciprofloxacin-resistant E. coli (odds ratio 12.75 [95% CI 1.0-157.1], p=0.047). Conclusion: Resistance emerged against oxytetracycline and ciprofloxacin in commensal E. coli strains circulating in live poultry and farm environments in Bangladesh seems to be very high. Thus, human infection with drug-resistant E. coli strains through food chain will critically compromise the therapeutic measures currently available.
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Affiliation(s)
- Avijit Das
- Department of Microbiology and Veterinary Public Health, Chattogram Veterinary and Animal Sciences University, Khulshi, Chattogram, Bangladesh
| | - Pangkaj Kumar Dhar
- Department of Microbiology and Veterinary Public Health, Chattogram Veterinary and Animal Sciences University, Khulshi, Chattogram, Bangladesh
| | - Avijit Dutta
- Department of Microbiology and Veterinary Public Health, Chattogram Veterinary and Animal Sciences University, Khulshi, Chattogram, Bangladesh
| | - Mohammad Shah Jalal
- Department of Microbiology and Veterinary Public Health, Chattogram Veterinary and Animal Sciences University, Khulshi, Chattogram, Bangladesh
| | - Priya Ghosh
- Department of Microbiology and Veterinary Public Health, Chattogram Veterinary and Animal Sciences University, Khulshi, Chattogram, Bangladesh
| | - Tridip Das
- Department of Microbiology and Veterinary Public Health, Chattogram Veterinary and Animal Sciences University, Khulshi, Chattogram, Bangladesh
| | - Himel Barua
- Department of Microbiology and Veterinary Public Health, Chattogram Veterinary and Animal Sciences University, Khulshi, Chattogram, Bangladesh
| | - Paritosh Kumar Biswas
- Department of Microbiology and Veterinary Public Health, Chattogram Veterinary and Animal Sciences University, Khulshi, Chattogram, Bangladesh
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16
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Dutta A, Islam MZ, Barua H, Rana EA, Jalal MS, Dhar PK, Das A, Das T, Sarma SM, Biswas SK, Biswas PK. Acquisition of Plasmid-Mediated Colistin Resistance Gene mcr-1 in Escherichia coli of Livestock Origin in Bangladesh. Microb Drug Resist 2020; 26:1058-1062. [PMID: 32349645 DOI: 10.1089/mdr.2019.0304] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Aims: To investigate plasmid-borne colistin resistance mechanism (plasmid-mediated colistin resistance [mcr-1]) in Escherichia coli of human, veterinary, and environmental origin in Bangladesh. Materials and methods: A total of 810 samples were collected from different sources. Isolation and identification of E. coli was performed using classical bacteriology and then tested for antimicrobial susceptibility. Colistin-resistant isolates were further analyzed for mcr-1 gene using PCR. Minimum inhibitory concentration (MIC) was determined using microbroth dilution technique. After sequencing of mcr-1 gene, phylogenetics was conducted to see the relationship with other mcr-1 gene sequences. Results: A total of 358 E. coli were isolated from 810 samples of humans, animals, environment, and food in Bangladesh. Of them 49 (15.9%) isolates were phenotypically resistant to colistin and 254 (70.9%) were resistant to multiple antimicrobials. mcr-1 gene was detected in three E. coli isolates of poultry source. For the three mcr-1 positive isolates the MIC of colistin sulfate was 4, 8, and 128 μg/mL. Gene sequencing of two of the three mcr-1 positive isolates and phylogenetic analysis showed close similarities of one isolate to other mcr-1 sequences available at GenBank while the other appeared to have evolved locally. Conclusion: First-ever report on circulation of mcr-1 E. coli of livestock origin in Bangladesh.
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Affiliation(s)
- Avijit Dutta
- Department of Microbiology and Veterinary Public Health, Chattogram Veterinary and Animal Sciences University (CVASU), Chattogram, Bangladesh
| | - Md Zohorul Islam
- Department of Microbiology and Veterinary Public Health, Chattogram Veterinary and Animal Sciences University (CVASU), Chattogram, Bangladesh
| | - Himel Barua
- Department of Microbiology and Veterinary Public Health, Chattogram Veterinary and Animal Sciences University (CVASU), Chattogram, Bangladesh
| | - Eaftekhar Ahmed Rana
- Department of Microbiology and Veterinary Public Health, Chattogram Veterinary and Animal Sciences University (CVASU), Chattogram, Bangladesh
| | - Mohammad Shah Jalal
- Department of Microbiology and Veterinary Public Health, Chattogram Veterinary and Animal Sciences University (CVASU), Chattogram, Bangladesh
| | - Pangkaj Kumar Dhar
- Department of Microbiology and Veterinary Public Health, Chattogram Veterinary and Animal Sciences University (CVASU), Chattogram, Bangladesh
| | - Avijit Das
- Department of Microbiology and Veterinary Public Health, Chattogram Veterinary and Animal Sciences University (CVASU), Chattogram, Bangladesh
| | - Tridip Das
- Department of Microbiology and Veterinary Public Health, Chattogram Veterinary and Animal Sciences University (CVASU), Chattogram, Bangladesh
| | - Sabuj Manohar Sarma
- Department of Microbiology and Veterinary Public Health, Chattogram Veterinary and Animal Sciences University (CVASU), Chattogram, Bangladesh
| | - Sanjoy Kanti Biswas
- Department of Microbiology, Chattogram-Maa-O-Shishu Hospital Medical College, Chattogram, Bangladesh
| | - Paritosh Kumar Biswas
- Department of Microbiology and Veterinary Public Health, Chattogram Veterinary and Animal Sciences University (CVASU), Chattogram, Bangladesh
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17
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Barnett T, Pfeiffer DU, Ahasanul Hoque M, Giasuddin M, Flora MS, Biswas PK, Debnath N, Fournié G. Practising co-production and interdisciplinarity: Challenges and implications for one health research. Prev Vet Med 2020; 177:104949. [PMID: 32203814 PMCID: PMC7218707 DOI: 10.1016/j.prevetmed.2020.104949] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2019] [Revised: 02/20/2020] [Accepted: 03/08/2020] [Indexed: 01/21/2023]
Abstract
We review the nature of interdisciplinary research in relation to One Health, a perspective on human-animal health which would appear to merit close interdisciplinary cooperation to inform public health policy. We discuss the relationship between biological sciences, epidemiology and the social sciences and note that interdisciplinary work demands attention be given to a range of often neglected epistemological and methodological issues. Epidemiologists may sometimes adopt social science techniques as "bolt-ons"1 to their research without having a complete understanding of how the social sciences work. The paper introduces a range of social science concepts and applies them to the challenges of understanding and practicing participatory and local epidemiology. We consider the problem of co-production of knowledge about One Health and zoonotic diseases in relation to funding structures, working in large international teams and explore some of the often-neglected realities of working across disciplines and cultures. We do this in part by applying the concept of value-chain to the research process.
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Affiliation(s)
- Tony Barnett
- Department of Global Health and Development, London School of Hygiene and Tropical Medicine, 15-17 Keppel Street, Bloomsbury, London WC1E 7HT, United Kingdom; Veterinary Epidemiology, Economics and Public Health Group, Department of Pathobiology and Population Sciences, Royal Veterinary College, Hawkshead Lane, North Mymms, Hatfield AL9 7TA, United Kingdom; Humanitarian and Conflict Response Institute, University of Manchester, Ellen Wilkinson Building, Manchester M15 6JA, United Kingdom.
| | - Dirk Udo Pfeiffer
- Veterinary Epidemiology, Economics and Public Health Group, Department of Pathobiology and Population Sciences, Royal Veterinary College, Hawkshead Lane, North Mymms, Hatfield AL9 7TA, United Kingdom; Centre for Applied One Health Research and Policy Advice, College of Veterinary Medicine and Life Sciences, City University of Hong Kong, Kowloon, Hong Kong SAR, China
| | - Md Ahasanul Hoque
- Department of Medicine & Surgery, Faculty of Veterinary Medicine, Chattogram Veterinary and Animal Sciences University, Chattogram, Zakir Hossain Road, Khulshi, Bangladesh
| | | | | | - Paritosh Kumar Biswas
- Department of Microbiology and Veterinary Public Health, Chattogram Veterinary and Animal Sciences University, Chattogram, Zakir Hossain Road, Khulshi, Bangladesh
| | - Nitish Debnath
- Teaching and Training Pet Hospital and Research Center, Chattogram Veterinary and Animal Sciences University, Sector #18, Road #114, Plot: 5B, Purbachol, Dhaka, Bangladesh; Centre on Global Health Security, Chatham House, 10 St James's Square, St. James's, London SW1Y 4LE, United Kingdom
| | - Guillaume Fournié
- Veterinary Epidemiology, Economics and Public Health Group, Department of Pathobiology and Population Sciences, Royal Veterinary College, Hawkshead Lane, North Mymms, Hatfield AL9 7TA, United Kingdom
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Bhattacharyya A, Panda K, Adroja DT, Kase N, Biswas PK, Saha S, Das T, Lees MR, Hillier AD. Investigation of superconducting gap structure in HfIrSi using muon spin relaxation/rotation. J Phys Condens Matter 2020; 32:085601. [PMID: 31689696 DOI: 10.1088/1361-648x/ab549e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
We have investigated the superconducting state of HfIrSi using magnetization, specific heat, muon spin rotation and relaxation ([Formula: see text]SR) measurements. Superconductivity was observed at [Formula: see text] K in both specific heat and magnetization measurements. From an analysis of the transverse-field [Formula: see text]SR data, it is clear that the temperature variation of superfluid density is well fitted by an isotropic Bardeen-Cooper-Schrieffer (BCS) type s-wave gap structure. The superconducting carrier density [Formula: see text] m-3, the magnetic penetration depth, [Formula: see text] nm, and the effective mass, [Formula: see text], were calculated from the TF-[Formula: see text]SR data. Zero-field [Formula: see text]SR data for HfIrSi reveal the absence of any spontaneous magnetic moments below [Formula: see text], indicating that time-reversal symmetry (TRS) is preserved in the superconducting state of HfIrSi. Theoretical investigations suggest that the Hf and Ir atoms hybridize strongly along the c-axis, and that this is responsible for the strong three-dimensionality of this system which screens the Coulomb interaction. As a result, despite the presence of d-electrons in HfIrSi, these correlation effects are weakened, making the electron-phonon coupling more important.
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Affiliation(s)
- A Bhattacharyya
- Department of Physics, Ramakrishna Mission Vivekananda Educational and Research Institute, Howrah 711202, West Bengal, India
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Bhattacharyya A, Adroja DT, Biswas PK, Sato YJ, Lees MR, Aoki D, Hillier AD. Ir 5d-band derived superconductivity in LaIr 3. J Phys Condens Matter 2020; 32:065602. [PMID: 31509814 DOI: 10.1088/1361-648x/ab4389] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
The superconducting properties of rhombohedral LaIr3 were examined using susceptibility, resistivity, heat capacity, and zero-field (ZF) and transverse-field (TF) muon spin relaxation and rotation ([Formula: see text]SR) measurements. The susceptibility and resistivity measurements confirm a superconducting transition below [Formula: see text] K. Two successive transitions are observed in the heat capacity data, one at [Formula: see text] K and a second at 1.2 K below [Formula: see text]. The heat capacity jump is [Formula: see text], which is lower than 1.43 expected for Bardeen-Cooper-Schrieffer (BCS) weak-coupling limit. TF-[Formula: see text]SR measurements reveal a fully gapped s-wave superconductivity with [Formula: see text], which is small compared to the BCS value of 3.56, suggesting weak-coupling superconductivity. The magnetic penetration depth, [Formula: see text], estimated from TF-[Formula: see text]SR gives [Formula: see text] nm, a superconducting carrier density [Formula: see text] carriers m-3 and a carrier effective-mass enhancement factor [Formula: see text]. ZF-[Formula: see text]SR data show no evidence for any spontaneous magnetic fields below [Formula: see text], which demonstrates that time-reversal symmetry is preserved in the superconducting state of LaIr3.
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Affiliation(s)
- A Bhattacharyya
- Department of Physics, Ramakrishna Mission Vivekananda Educational and Research Institute, Belur Math, Howrah 711202, West Bengal, India
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Biswas PK, Gomez NC, Biswas S, Gupta SD, Howlader SS, Chanda PK, Ahmed F. Significant Left Main Coronary Artery Disease Does Not Incur Any Additional Risk to the Short Term Outcome of Off Pump Coronary Artery Bypass Grafting Surgery. Mymensingh Med J 2020; 29:187-194. [PMID: 31915357] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Coronary artery disease is the most common form of heart disease and single most important cause of premature death in developed countries. Off pump coronary artery bypass grafting surgery has recently became widespread internationally and has produced good clinical outcome even in left main coronary artery disease following off pump coronary artery bypass grafting surgery. A prospective observational study was conducted in the department of Cardiac Surgery, National Heart Foundation Hospital and Research Institute, Dhaka, Bangladesh from January 2015 to September 2016 after fulfillment of enrollment criteria, 428 patients were studied for the purpose of the study and they were grouped in two, significant left main coronary artery disease in group A and non left main coronary artery disease requiring surgery in group B. Comparison of risk factors between groups demonstrates that diabetes mellitus and smoking habit between two groups were almost identical. 69.2% of patient with significant left main coronary artery group were hypertensive and 25.2% were dyslipidaemic in comparison to non left main coronary artery disease group which were 50.9% and 6.5% respectively. Requirement of per operative inotropic support was significantly higher in left main coronary artery group. 33.6% of patient of left main coronary artery group required per operative inotropic support whereas non left main coronary artery group require 24.8%. Postoperative inotropic support, mechanical ventilation time, ICU stay, hospital stay and complication were similar in both these groups. So, we can say that off pump coronary artery bypass grafting surgery for significant left main coronary artery disease is as safe as non left main coronary artery disease.
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Affiliation(s)
- P K Biswas
- Dr Prodip Kumar Biswas, Registrar, Cardiac Surgery, National Heart Foundation Hospital and Research Institute (NHFH&RI), Mirpur, Dhaka, Bangladesh; E-mail:
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Singh D, Sajilesh KP, Marik S, Biswas PK, Hillier AD, Singh RP. Nodeless s-wave superconductivity in the [Formula: see text]-Mn structure type noncentrosymmetric superconductor TaOs: a [Formula: see text]SR study. J Phys Condens Matter 2020; 32:015602. [PMID: 31509816 DOI: 10.1088/1361-648x/ab43a4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Noncentrosymmetric superconductors can lead to a variety of exotic properties in the superconducting state such as line nodes, multigap behavior, and time-reversal symmetry breaking. In this paper, we report the properties of a new noncentrosymmetric superconductor TaOs, using muon spin relaxation and rotation measurements. It is shown using the zero-field muon experiment that TaOs preserve the time-reversal symmetry in the superconducting state. From the transverse field muon measurements, we extract the temperature dependence of [Formula: see text], which is proportional to the superfluid density. This data can be fit with a fully gapped s-wave model for [Formula: see text] = 2.01 [Formula: see text] 0.02. Furthermore, the value of magnetic penetration depth is found to be 5919 [Formula: see text] 45 [Formula: see text], which is consistent with the value obtained from the bulk measurements.
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Affiliation(s)
- D Singh
- Indian Institute of Science Education and Research Bhopal, Bhopal, 462066, India
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Alam F, Joarder AI, Nahid A, Debnath BC, Masud Rana AM, Biswas PK, Khan AS, Jalal MT, Karim SS. Nodular Mucinosis of Male Breast: A Rare Case Report. Mymensingh Med J 2019; 28:699-704. [PMID: 31391448] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Multinodular accumulation of stromal mucin in breast known as nodular mucinosis is an extremely rare condition of breast. Alternatively it is known as myxoma or nerve sheath myxoma of breast. This benign lesion is confined to only nipple and areola region presenting as slow growing, soft and non tender lobulated mass. Histopathologically it reveals well circumscribed non-encapsulated myxoid/mucinous lesion with few infiltration of spindle cells within a collaginized stroma. The mucinous substance is stained positively with Alcian blue. Mucinous carcinoma or phylloids tumour are important differential diagnosis of nodular mucinosis of breast. Here we report a case of nodular mucinosis of male breast with clinical, radiological and pathological findings with differential diagnosis and treatment modalities.
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Affiliation(s)
- F Alam
- Dr Ferdous Alam, Assistant Professor, Department of Surgery, Bangabandhu Sheikh Mujib Medical University (BSMMU), Dhaka, Bangladesh; E-mail:
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Joarder AI, Alam F, Islam MA, Debnath BC, Masud Rana AM, Biswas PK, Khan AS, Karim SS, Uddin MB. Laparoscopic Adrenalectomy: Two Years Experience at Bangabandhu Sheikh Mujib Medical University. Mymensingh Med J 2019; 28:641-646. [PMID: 31391438] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Laparoscopic surgery has become an efficient tool for many complex surgical procedures. In last decades, laparoscopic adrenalectomy has become a more viable option for removal of adrenal pathology, with many surgeons preferring it to the conventional open technique. This study was done to evaluate the outcomes of lateral transperitoneal adrenalectomy (LTA) in our department and evaluate the feasibility of lateral transperitoneal adrenalectomy (LTA) in our perspective. This study is case series observational study carried out at Bangabandhu Sheikh Mujib Medical University, Dhaka, Bangladesh from March 2015 to May 2017. Suspected primary adrenal malignancies were excluded. Seventeen (17) patients (10 male and 7 females with mean age of 35.29 years) underwent 18 adrenalectomy (one bilateral). Seventeen (17) adrenal tumours were resected through laparoscopy and one adrenal tumour is resected through open approach due to conversion. All the patients underwent hormonal evaluation, ultrasonogram and computed tomography of whole abdomen. Ten (10) patients (58.82%) had hormonal active adrenal mass. Seven (7) patients (41.18%) were asymptomatic of which 2 had associated cholelithiasis, 7 patients had generalized weakness, 3 had weight gain with Cushing syndrome (one drug induced) and one had Hirsutism with musculanizing effect. Nine (9) patients had hypertension and 6 patients had diabetes mellitus. Eight (8) right, 8 left and 1 bilateral LTA were performed. The mean age of the patients were 35.29 years, adrenal tumour size ranges from 15-65mm and operation time ranges from 75-120 minutes for unilateral adrenalectomies and 220 minutes for bilateral adrenalectomy. Estimated blood loss ranges from 30 to 130 ml in 16 cases and in one case it was 220 ml in which conversion was done. Mean post operative stay in hospital was 3.94 days. In 16 cases no major or minor complications were observed but in one case due to haemorrhage and infiltration of the tumour to kidney conversion are done in the form of right adrenalectomy with upper partial nephrectomy (Histopathology revealed angiomyolipoma). In pathological examination 9 patients (52.94%) had adrenocortical adenoma, 2 patients (11.76%) had phaeochromocytoma including bilateral one, 2 patients (11.76%) had myolipoma of which one converted to open, 2 patients (11.76%) had adrenocortical hyperplasia, one patient (5.88%) had adrenal cyst and one patient (5.88%) had haemorrhagic cyst. LTA is a safe and efficient minimally invasive treatment options for both secreting and non secreting adrenal masses. The procedure has a learning curve and should be performed by a surgeon experienced in both open and laparoscopic adrenal surgery.
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Affiliation(s)
- A I Joarder
- Dr Md Aminul Islam Joarder, Associate Professor, Department of Surgery, Bangabandhu Sheikh Mujib Medical University (BSMMU), Dhaka, Bangladesh
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Jalal MS, Islam MZ, Dutta A, Dhar PK, Das A, Hasan MM, Barua H, Biswas PK, Ahad A. Antibiotic resistant zoonotic bacteria in Irrawaddy squirrel (Callosciurus pygerythrus). Vet Med Sci 2018; 5:260-268. [PMID: 30488592 PMCID: PMC6556763 DOI: 10.1002/vms3.138] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022] Open
Abstract
Irrawaddy squirrel (Callosciurus pygerythrus) may play an important role in the transmission of zoonotic bacteria, but little is known about the carriage of zoonotic bacteria in this common frugivorous rodent in Bangladesh. We aimed to investigate the presence of common zoonotic bacterial pathogens in Irrawaddy squirrel in the southeast part of Bangladesh. A total of 27 rectal and 27 oro‐nasal swabs were collected from 27 healthy wild Irrawaddy squirrels. Four common zoonotic bacteria were isolated following routine laboratory procedures, and were identified based on colony morphology, and biochemical and staining properties. The pathogenic potential of the identified bacteria was confirmed by detection of virulence genes by PCR. All isolates were subjected to antimicrobial susceptibility test against seven antibiotics from six generic groups which are commonly used in human and veterinary medicine in Bangladesh. The prevalence of Escherichia coli, Salmonella spp., Yersinia spp. and Staphylococcus spp. was 44.4% (95% CI, 32.0–57.6), 13% (95% CI, 6.1–24.7), 44.4% (95% CI, 32.0–57.6), and 72.2% (95% CI, 59.0–82.5), respectively. We identified potential zoonotic virulence genes in all of these four bacterial species. Antimicrobial susceptibility testing revealed the presence of several multidrug resistant bacterial strains in squirrels. To the best of our knowledge, this is the first report in Bangladesh of the detection of antibiotic resistant zoonotic bacteria in Irrawaddy squirrels. The findings underpin the role of Irrawaddy squirrel as a source of pathogenic antibiotic resistant bacteria, consequently, fruit rejected because of squirrel consumption and squirrel‐bites deserve more concern than previously.
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Affiliation(s)
- Mohammad Shah Jalal
- Department of Microbiology and Veterinary Public Health, Chittagong Veterinary and Animal Sciences University (CVASU), Chittagong, Bangladesh
| | - Md Zohorul Islam
- Department of Microbiology and Veterinary Public Health, Chittagong Veterinary and Animal Sciences University (CVASU), Chittagong, Bangladesh.,Department of Microbiology and Infection Control, Statens Serum Institute, Copenhagen, Denmark
| | - Avijit Dutta
- Department of Microbiology and Veterinary Public Health, Chittagong Veterinary and Animal Sciences University (CVASU), Chittagong, Bangladesh
| | - Pangkaj Kumar Dhar
- Department of Microbiology and Veterinary Public Health, Chittagong Veterinary and Animal Sciences University (CVASU), Chittagong, Bangladesh
| | - Avijit Das
- Department of Microbiology and Veterinary Public Health, Chittagong Veterinary and Animal Sciences University (CVASU), Chittagong, Bangladesh
| | - Mohammad Mahbub Hasan
- Department of Microbiology and Veterinary Public Health, Chittagong Veterinary and Animal Sciences University (CVASU), Chittagong, Bangladesh
| | - Himel Barua
- Department of Microbiology and Veterinary Public Health, Chittagong Veterinary and Animal Sciences University (CVASU), Chittagong, Bangladesh
| | - Paritosh Kumar Biswas
- Department of Microbiology and Veterinary Public Health, Chittagong Veterinary and Animal Sciences University (CVASU), Chittagong, Bangladesh.,Poultry Research and Training Center, CVASU, Chittagong, Bangladesh
| | - Abdul Ahad
- Department of Microbiology and Veterinary Public Health, Chittagong Veterinary and Animal Sciences University (CVASU), Chittagong, Bangladesh
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Dhar PK, Dutta A, Das A, Jalal MS, Barua H, Biswas PK. Validation of real-time reverse transcription polymerase chain reaction to detect virus titer and thermostability of Newcastle disease live virus vaccine. Vet World 2018; 11:1597-1603. [PMID: 30587895 PMCID: PMC6303490 DOI: 10.14202/vetworld.2018.1597-1603] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2018] [Accepted: 10/09/2018] [Indexed: 12/13/2022] Open
Abstract
Background and Aim Newcastle disease is one of the most common diseases affecting poultry in Bangladesh. The disease can cause up to 100% mortality but is preventable if birds are timely and properly vaccinated with a vaccine of standard virus titer. Different live vaccines are commercially available in the country - most, if not all, are produced using lentogenic strains of the virus with variable virulence. One of the disadvantages of these vaccines is that they are not stable at high environmental temperature, and therefore, a proper cold chain must be maintained during transportation and storage. Information on how long these vaccine viruses can withstand environmental temperature, which is near the vicinity of 37°C in the summer season in Bangladesh, is scanty. The aim of this research was to measure the effect of temperature on virus titer of live ND virus vaccines and to develop a real-time reverse transcription polymerase chain reaction (rRT-PCR) standard curve to indirectly determine hemagglutination (HA) titer of virus by this highly sensitive method. Materials and Methods In this study, thermostability of five commercial live vaccines containing LaSota, F, Clone 30, and B1 type LaSota strains was observed for up to 35 days keeping them at 37°C. From the most thermostability yielding sample, two rRT-PCR standard curves were developed: (1) By plotting the cycle threshold (CT) values as obtained from 10-fold serial dilutions up to 10-3 against their corresponding log (to the base 10) dilutions and (2) by plotting the CT values obtained from serial HA dilutions up to 2-4 against their corresponding HA titer dilutions. The PCR efficiencies based on which the graphs were fitted were also evaluated. Results The vaccine from the LaSota strain withstood 37°C for 35 days with a gradual declination of HA titer over time, and this vaccine also had the highest initial HA titer, which was 211. The vaccine made from F strain was inactivated quickly, and it had the lowest HA titer at the beginning of the study. The first standard curve developed can be used to assess the level of virus titer in a diluted sample compared with the titer in the original undiluted vaccine preparation by plotting the CT value obtained from the dilution by rRT-PCR. The second standard curve can be used to calculate the HA titer of a vaccine dilution by plotting the CT value as obtained from the dilution by rRT-PCR. Conclusion The regression equations for the first and second graphs were y=-3.535x+14.365 and y=-1.081x+13.703, respectively, suggesting that, for every 3.53 cycles, the PCR product would have increased 10 times and 2 times for every 1.08 cycles, respectively, indicating nearly (but not exactly) 100% PCR efficiency.
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Affiliation(s)
- Pangkaj Kumar Dhar
- Department of Microbiology and Veterinary Public Health, Chittagong Veterinary and Animal Sciences University, Khulshi, Chittagong-4225, Bangladesh
| | - Avijit Dutta
- Department of Microbiology and Veterinary Public Health, Chittagong Veterinary and Animal Sciences University, Khulshi, Chittagong-4225, Bangladesh
| | - Avijit Das
- Department of Microbiology and Veterinary Public Health, Chittagong Veterinary and Animal Sciences University, Khulshi, Chittagong-4225, Bangladesh
| | - Mohammad Shah Jalal
- Department of Microbiology and Veterinary Public Health, Chittagong Veterinary and Animal Sciences University, Khulshi, Chittagong-4225, Bangladesh
| | - Himel Barua
- Department of Microbiology and Veterinary Public Health, Chittagong Veterinary and Animal Sciences University, Khulshi, Chittagong-4225, Bangladesh
| | - Paritosh Kumar Biswas
- Department of Microbiology and Veterinary Public Health, Chittagong Veterinary and Animal Sciences University, Khulshi, Chittagong-4225, Bangladesh
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Majumder M, Manna RS, Simutis G, Orain JC, Dey T, Freund F, Jesche A, Khasanov R, Biswas PK, Bykova E, Dubrovinskaia N, Dubrovinsky LS, Yadav R, Hozoi L, Nishimoto S, Tsirlin AA, Gegenwart P. Breakdown of Magnetic Order in the Pressurized Kitaev Iridate β-Li_{2}IrO_{3}. Phys Rev Lett 2018; 120:237202. [PMID: 29932706 DOI: 10.1103/physrevlett.120.237202] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/19/2018] [Indexed: 06/08/2023]
Abstract
Temperature-pressure phase diagram of the Kitaev hyperhoneycomb iridate β-Li_{2}IrO_{3} is explored using magnetization, thermal expansion, magnetostriction, and muon spin rotation measurements, as well as single-crystal x-ray diffraction under pressure and ab initio calculations. The Néel temperature of β-Li_{2}IrO_{3} increases with the slope of 0.9 K/GPa upon initial compression, but the reduction in the polarization field H_{c} reflects a growing instability of the incommensurate order. At 1.4 GPa, the ordered state breaks down upon a first-order transition, giving way to a new ground state marked by the coexistence of dynamically correlated and frozen spins. This partial freezing in the absence of any conspicuous structural defects may indicate the classical nature of the resulting pressure-induced spin liquid, an observation paralleled to the increase in the nearest-neighbor off-diagonal exchange Γ under pressure.
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Affiliation(s)
- M Majumder
- Experimental Physics VI, Center for Electronic Correlations and Magnetism, University of Augsburg, 86159 Augsburg, Germany
| | - R S Manna
- Experimental Physics VI, Center for Electronic Correlations and Magnetism, University of Augsburg, 86159 Augsburg, Germany
- Department of Physics, IIT Tirupati, Tirupati 517506, India
| | - G Simutis
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institut, 5232 Villigen PSI, Switzerland
| | - J C Orain
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institut, 5232 Villigen PSI, Switzerland
| | - T Dey
- Experimental Physics VI, Center for Electronic Correlations and Magnetism, University of Augsburg, 86159 Augsburg, Germany
| | - F Freund
- Experimental Physics VI, Center for Electronic Correlations and Magnetism, University of Augsburg, 86159 Augsburg, Germany
| | - A Jesche
- Experimental Physics VI, Center for Electronic Correlations and Magnetism, University of Augsburg, 86159 Augsburg, Germany
| | - R Khasanov
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institut, 5232 Villigen PSI, Switzerland
| | - P K Biswas
- ISIS Pulsed Neutron and Muon Source, STFC Rutherford Appleton Laboratory, Harwell Campus, Didcot, Oxfordshire OX11 0QX, United Kingdom
| | - E Bykova
- Laboratory of Crystallography, Material Physics and Technology at Extreme Conditions, Universität Bayreuth, 95440 Bayreuth, Germany
| | - N Dubrovinskaia
- Laboratory of Crystallography, Material Physics and Technology at Extreme Conditions, Universität Bayreuth, 95440 Bayreuth, Germany
| | - L S Dubrovinsky
- Bayerisches Geoinstitut, Universität Bayreuth, 95440 Bayreuth, Germany
| | - R Yadav
- Institute for Theoretical Physics, IFW Dresden, 01069 Dresden, Germany
| | - L Hozoi
- Institute for Theoretical Physics, IFW Dresden, 01069 Dresden, Germany
| | - S Nishimoto
- Institute for Theoretical Physics, IFW Dresden, 01069 Dresden, Germany
| | - A A Tsirlin
- Experimental Physics VI, Center for Electronic Correlations and Magnetism, University of Augsburg, 86159 Augsburg, Germany
| | - P Gegenwart
- Experimental Physics VI, Center for Electronic Correlations and Magnetism, University of Augsburg, 86159 Augsburg, Germany
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Biswas PK, Giasuddin M, Chowdhury P, Barua H, Debnath NC, Yamage M. Incidence of contamination of live bird markets in Bangladesh with influenza A virus and subtypes H5, H7 and H9. Transbound Emerg Dis 2017; 65:687-695. [PMID: 29226568 DOI: 10.1111/tbed.12788] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2017] [Indexed: 01/31/2023]
Abstract
In the absence of robust active surveillance of avian influenza viruses (AIV) affecting poultry in South Asian countries, monitoring of live bird markets (LBMs) can be an alternative. In a longitudinal study of 32 LBM, five environments were sampled as follows: market floor, stall floor, slaughter area, poultry holding cage and water used for meat processing. Samples were taken monthly for 5 months, September 2013-January 2014. Incidence rates (IRs) of LBM contamination with AIV and its subtypes H5, H7 and H9 were assessed. In 10 of the LBM selected, biosecurity measures had been implemented through FAO interventions: the other 22 were non-intervened. Standard procedures were applied to detect AIV and three subtypes in pooled samples (1:5). An LBM was considered positive for AIV or a subtype if at least one of the pooled samples tested positive. The incidence rates of LBM contamination with AIV, H5, H7 and H9 were 0.194 (95% confidence interval (CI) 0.136-0.276), 0.031 (95% CI 0.013-0.075), 0 and 0.175 (95% CI 0.12-0.253) per LBM-month at risk, respectively. The log IR ratio between the FAO-intervened and non-intervened LBM for contamination with AIV was -0.329 (95% CI -1.052 to -0.394, p = .372), 0.598 (95% CI -1.593 to 2.789, p = .593) with subtype H5 and -0.500 (95% CI -1.249 to 0.248, p = .190) with subtype H9, indicating no significant difference. The results obtained suggest that both H5 and H9 were circulating in LBM in Bangladesh in the second half of 2013. The incidence of contamination with H9 was much higher than with H5.
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Affiliation(s)
- P K Biswas
- Department of Microbiology and Veterinary Public Health, Chittagong Veterinary and Animal Sciences University, Chittagong, Bangladesh
| | - M Giasuddin
- National Reference Laboratories for Avian Influenza, Bangladesh Livestock Research Institute, Savar, Bangladesh
| | - P Chowdhury
- Department of Livestock Services, Chittagong, Bangladesh
| | - H Barua
- Department of Microbiology and Veterinary Public Health, Chittagong Veterinary and Animal Sciences University, Chittagong, Bangladesh
| | - N C Debnath
- Department of Microbiology and Veterinary Public Health, Chittagong Veterinary and Animal Sciences University, Chittagong, Bangladesh.,Emergency Centre for Transboundary Animal Diseases (ECTAD), Food and Agriculture Organization of the United Nations, Dhaka, Bangladesh
| | - M Yamage
- Emergency Centre for Transboundary Animal Diseases (ECTAD), Food and Agriculture Organization of the United Nations, Dhaka, Bangladesh
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Rume FI, Ahsan CR, Biswas PK, Yasmin M, Braun P, Walter MC, Antwerpen M, Grass G, Hanczaruk M. Unexpected genomic relationships between Bacillus anthracis strains from Bangladesh and Central Europe. Infect Genet Evol 2016; 45:66-74. [PMID: 27543395 DOI: 10.1016/j.meegid.2016.08.017] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/27/2016] [Revised: 08/11/2016] [Accepted: 08/15/2016] [Indexed: 12/28/2022]
Abstract
The zoonosis anthrax caused by the bacterium Bacillus anthracis has a broad geographical distribution. Active enzootic areas are typically located away from central and northern Europe where cases of the disease occur only sporadically and in limited numbers. In contrast, a few out of the 64 districts of Bangladesh are hyper-endemic for anthrax and there the disease causes major losses in live-stock. In this study we genotyped eight strains of B. anthracis collected from the districts of Sirajganj and Tangail in 2013. All these strains belonged to canSNP group A.Br.001/002 Sterne differing only in a few of 31 tandem-repeat (MLVA)-markers. Whole genome sequences were obtained from five of these strains and compared with genomic information of B. anthracis strains originating from various geographical locations. Characteristic signatures were detected defining two "Bangladesh" clusters potentially useful for rapid molecular epidemiology. From this data high-resolution PCR assays were developed and subsequently tested on additional isolates from Bangladesh and Central Europe. Remarkably, this comparative genomic analysis focusing on SNP-discovery revealed a close genetic relationship between these strains from Bangladesh and historic strains collected between 1991 and 2008 in The Netherlands and Germany, respectively. Possible explanations for these phylogenetic relationships are discussed.
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Affiliation(s)
- Farzana Islam Rume
- Department of Microbiology, University of Dhaka, Dhaka 1000, Bangladesh; Department of Microbiology & Public Health, Patuakhali Science and Technology University, Khanpura, Babugonj, Barisal, Bangladesh
| | | | - Paritosh Kumar Biswas
- Department of Microbiology & Veterinary Public Health, Chittagong Veterinary and Animal Sciences University, Chittagong, Bangladesh
| | - Mahmuda Yasmin
- Department of Microbiology, University of Dhaka, Dhaka 1000, Bangladesh
| | - Peter Braun
- Bundeswehr Institute of Microbiology, Munich, Germany
| | | | | | - Gregor Grass
- Bundeswehr Institute of Microbiology, Munich, Germany.
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29
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Chakraborty S, Asare BK, Biswas PK, Rajnarayanan RV. Designer interface peptide grafts target estrogen receptor alpha dimerization. Biochem Biophys Res Commun 2016; 478:116-122. [PMID: 27462021 DOI: 10.1016/j.bbrc.2016.07.083] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2016] [Accepted: 07/19/2016] [Indexed: 11/15/2022]
Abstract
The nuclear transcription factor estrogen receptor alpha (ERα), triggered by its cognate ligand estrogen, regulates a variety of cellular signaling events. ERα is expressed in 70% of breast cancers and is a widely validated target for anti-breast cancer drug discovery. Administration of anti-estrogen to block estrogen receptor activation is still a viable anti-breast cancer treatment option but anti-estrogen resistance has been a significant bottle-neck. Dimerization of estrogen receptor is required for ER activation. Blocking ERα dimerization is therefore a complementary and alternative strategy to combat anti-estrogen resistance. Dimer interface peptide "I-box" derived from ER residues 503-518 specifically blocks ER dimerization. Recently using a comprehensive molecular simulation we studied the interaction dynamics of ERα LBDs in a homo-dimer. Based on this study, we identified three interface recognition peptide motifs LDKITDT (ERα residues 479-485), LQQQHQRLAQ (residues 497-506), and LSHIRHMSNK (residues 511-520) and reported the suitability of using LQQQHQRLAQ (ER 497-506) as a template to design inhibitors of ERα dimerization. Stability and self-aggregation of peptide based therapeutics poses a significant bottle-neck to proceed further. In this study utilizing peptide grafted to preserve their pharmacophoric recognition motif and assessed their stability and potential to block ERα mediated activity in silico and in vitro. The Grafted peptides blocked ERα mediated cell proliferation and viability of breast cancer cells but did not alter their apoptotic fate. We believe the structural clues identified in this study can be used to identify novel peptidometics and small molecules that specifically target ER dimer interface generating a new breed of anti-cancer agents.
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Affiliation(s)
- S Chakraborty
- Laboratory of Computational Biophysics & Bioengineering, Department of Physics, Tougaloo College, Tougaloo, MS 39174, United States
| | - B K Asare
- Department of Pharmacology and Toxicology, University of Buffalo, Buffalo, NY 14214, United States
| | - P K Biswas
- Laboratory of Computational Biophysics & Bioengineering, Department of Physics, Tougaloo College, Tougaloo, MS 39174, United States.
| | - R V Rajnarayanan
- Department of Pharmacology and Toxicology, University of Buffalo, Buffalo, NY 14214, United States.
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30
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Rume FI, Affuso A, Serrecchia L, Rondinone V, Manzulli V, Campese E, Di Taranto P, Biswas PK, Ahsan CR, Yasmin M, Fasanella A, Hugh-Jones M. Genotype Analysis of Bacillus anthracis Strains Circulating in Bangladesh. PLoS One 2016; 11:e0153548. [PMID: 27082248 PMCID: PMC4833350 DOI: 10.1371/journal.pone.0153548] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2015] [Accepted: 03/31/2016] [Indexed: 11/30/2022] Open
Abstract
In Bangladesh, anthrax, caused by the bacterium Bacillus anthracis, is considered an endemic disease affecting ruminants with sporadic zoonotic occurrences in humans. Due to the lack of knowledge about risks from an incorrect removal of infected carcasses, the disease is not properly monitored, and because of the socio-economic conditions, the situation is under-reported and under-diagnosed. For sensitive species, anthrax represents a fatal outcome with sudden death and sometimes bleeding from natural orifices. The most common source of infection for ruminants is ingestion of spores during grazing in contaminated pastures or through grass and water contaminated with anthrax spores. Domestic cattle, sheep and goats can also become infected through contaminated bone meal (used as feed) originating from anthrax-infected carcasses. The present investigation was conducted to isolate B. anthracis organisms from 169 samples (73 soil, 1 tissue, 4 bone and 91 bone meal samples) collected from 12 different districts of Bangladesh. The sampling was carried out from 2012 to 2015. Twelve samples resulted positive for B. anthracis. Biomolecular analyses were conducted starting from the Canonical Single Nucleotide Polymorphism (CanSNP) to analyze the phylogenetic origin of strains. The analysis of genotype, obtained through the Multiple Locus Variable Number Tandem Repeat Analysis (MLVA) with the analysis of 15 Variable Number Tandem Repeats (VNTR), demonstrated four different genotypes: two of them were previously identified in the district of Sirajganj. The sub-genotyping, conducted with Single Nucleotide Repeats analysis, revealed the presence of eight subgenotypes. The data of the present study concluded that there was no observed correlation between imported cattle feed and anthrax occurrence in Bangladesh and that the remarkable genetic variations of B. anthracis were found in the soil of numerous outbreaks in this country.
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Affiliation(s)
- Farzana Islam Rume
- Department of Microbiology, Dhaka University. Dhaka, Bangladesh
- Department of Microbiology & Virology, Patuakhali Science and Technology University, Patuakhali, Bangladesh
| | - Alessia Affuso
- Istituto Zooprofilattico Sperimentale of Puglia and Basilicata, Anthrax Reference Institute of Italy, Foggia, Italy
- * E-mail:
| | - Luigina Serrecchia
- Istituto Zooprofilattico Sperimentale of Puglia and Basilicata, Anthrax Reference Institute of Italy, Foggia, Italy
| | - Valeria Rondinone
- Istituto Zooprofilattico Sperimentale of Puglia and Basilicata, Anthrax Reference Institute of Italy, Foggia, Italy
| | - Viviana Manzulli
- Istituto Zooprofilattico Sperimentale of Puglia and Basilicata, Anthrax Reference Institute of Italy, Foggia, Italy
| | - Emanuele Campese
- Istituto Zooprofilattico Sperimentale of Puglia and Basilicata, Anthrax Reference Institute of Italy, Foggia, Italy
| | - Pietro Di Taranto
- Istituto Zooprofilattico Sperimentale of Puglia and Basilicata, Anthrax Reference Institute of Italy, Foggia, Italy
| | - Paritosh Kumar Biswas
- Department of Microbiology & Veterinary Public Health, Chittagong Veterinary and Animal Sciences University, Chittagong, Bangladesh
| | | | - Mahmuda Yasmin
- Department of Microbiology, Dhaka University. Dhaka, Bangladesh
| | - Antonio Fasanella
- Istituto Zooprofilattico Sperimentale of Puglia and Basilicata, Anthrax Reference Institute of Italy, Foggia, Italy
| | - Martin Hugh-Jones
- School of the Coast & Environment, Louisiana State University, Baton Rouge, United States of America
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Nag A, Middey S, Bhowal S, Panda SK, Mathieu R, Orain JC, Bert F, Mendels P, Freeman PG, Mansson M, Ronnow HM, Telling M, Biswas PK, Sheptyakov D, Kaushik SD, Siruguri V, Meneghini C, Sarma DD, Dasgupta I, Ray S. Origin of the Spin-Orbital Liquid State in a Nearly J=0 Iridate Ba_{3}ZnIr_{2}O_{9}. Phys Rev Lett 2016; 116:097205. [PMID: 26991199 DOI: 10.1103/physrevlett.116.097205] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/16/2015] [Indexed: 06/05/2023]
Abstract
We show using detailed magnetic and thermodynamic studies and theoretical calculations that the ground state of Ba_{3}ZnIr_{2}O_{9} is a realization of a novel spin-orbital liquid state. Our results reveal that Ba_{3}ZnIr_{2}O_{9} with Ir^{5+} (5d^{4}) ions and strong spin-orbit coupling (SOC) arrives very close to the elusive J=0 state but each Ir ion still possesses a weak moment. Ab initio density functional calculations indicate that this moment is developed due to superexchange, mediated by a strong intradimer hopping mechanism. While the Ir spins within the structural Ir_{2}O_{9} dimer are expected to form a spin-orbit singlet state (SOS) with no resultant moment, substantial frustration arising from interdimer exchange interactions induce quantum fluctuations in these possible SOS states favoring a spin-orbital liquid phase down to at least 100 mK.
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Affiliation(s)
- Abhishek Nag
- Department of Materials Science, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India
| | - S Middey
- Centre for Advanced Materials, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India
| | - Sayantika Bhowal
- Department of Solid State Physics, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India
| | - S K Panda
- Centre for Advanced Materials, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India
| | - Roland Mathieu
- Department of Engineering Sciences, Uppsala University, P.O. Box 534, SE-751 21 Uppsala, Sweden
| | - J C Orain
- Laboratoire de Physique des Solides, UMR CNRS 8502, Université Paris-Sud, 91405 Orsay, France
| | - F Bert
- Laboratoire de Physique des Solides, UMR CNRS 8502, Université Paris-Sud, 91405 Orsay, France
| | - P Mendels
- Laboratoire de Physique des Solides, UMR CNRS 8502, Université Paris-Sud, 91405 Orsay, France
| | - P G Freeman
- Laboratory for Quantum Magnetism (LQM), École Polytechnique Fédérale de Lausanne (EPFL), Station 3, CH-1015 Lausanne, Switzerland
- Jeremiah Horrocks Institute for Mathematics, Physics and Astrophysics, University of Central Lancashire, Preston PR1 2HE, United Kingdom
| | - M Mansson
- Laboratory for Quantum Magnetism (LQM), École Polytechnique Fédérale de Lausanne (EPFL), Station 3, CH-1015 Lausanne, Switzerland
- Department of Materials and Nanophysics, KTH Royal Institute of Technology, Electrum 229, SE-16440 Kista, Sweden
| | - H M Ronnow
- Laboratory for Quantum Magnetism (LQM), École Polytechnique Fédérale de Lausanne (EPFL), Station 3, CH-1015 Lausanne, Switzerland
| | - M Telling
- ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot, Oxon OX110QX, United Kingdom
| | - P K Biswas
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
| | - D Sheptyakov
- Laboratory for Neutron Scattering and Imaging, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
| | - S D Kaushik
- UGC-DAE-Consortium for Scientific Research Mumbai Centre, R5 Shed, Bhabha Atomic Research Centre, Mumbai 400085, India
| | - Vasudeva Siruguri
- UGC-DAE-Consortium for Scientific Research Mumbai Centre, R5 Shed, Bhabha Atomic Research Centre, Mumbai 400085, India
| | - Carlo Meneghini
- Dipartimento di Scienze, Universitá Roma Tre, Via della Vasca Navale, 84 I-00146 Roma, Italy
| | - D D Sarma
- Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore 560012, India
| | - Indra Dasgupta
- Centre for Advanced Materials, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India
- Department of Solid State Physics, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India
| | - Sugata Ray
- Department of Materials Science, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India
- Centre for Advanced Materials, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India
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Biswas PK, Giasuddin M, Nath BK, Islam MZ, Debnath NC, Yamage M. Biosecurity and Circulation of Influenza A (H5N1) Virus in Live-Bird Markets in Bangladesh, 2012. Transbound Emerg Dis 2015; 64:883-891. [PMID: 26663031 DOI: 10.1111/tbed.12454] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2015] [Indexed: 11/29/2022]
Abstract
Bangladesh has been considered as one of the five countries endemic with highly pathogenic avian influenza A subtype H5N1 (HPAI H5N1). Live-bird markets (LBMs) in south Asian countries are believed to play important roles in the transmission of HPAI H5N1 and others due to its central location as a hub of the poultry trading. Food and Agriculture Organization (FAO) of the United Nations has been promoting improved biosecurity in LBMs in Bangladesh. In 2012, by enrolling 32 large LBMs: 10 with FAO interventions and 22 without assistance, we assessed the virus circulation in the selected LBMs by applying standard procedures to investigate market floors, poultry stall floors, poultry-holding cases and slaughter areas and the overall biosecurity using a questionnaire-based survey. Relative risk (RR) was examined to compare the prevalence of HPAI H5N1 in the intervened and non-intervened LBMs. The measures practised in significantly more of the FAO-intervened LBMs included keeping of slaughter remnants in a closed container; decontamination of poultry vehicles at market place; prevention of crows' access to LBM, market/floor cleaning by market committee; wet cleaning; disinfection of floor/poultry stall after cleaning; and good supply of clean water at market (P < 0.05). Conversely, disposal of slaughter remnants elsewhere at market and dry cleaning were in operation in more of the FAO non-intervened LBMs (P < 0.05). The RR for HPAI H5N1 in the intervened and non-intervened LBMs was 1.1 (95% confidence interval 0.44-2.76), suggesting that the proportion positive of the virus in the two kinds of LBM did not vary significantly (P = 0.413). These observations suggest that the viruses are still maintained at the level of production in farms and circulating in LBMs in Bangladesh regardless of interventions, albeit at lower levels than in other endemic countries.
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Affiliation(s)
- P K Biswas
- Department of Microbiology and Veterinary Public Health, Chittagong Veterinary and Animal Sciences University, Chittagong, Bangladesh
| | - M Giasuddin
- National Reference Laboratories for Avian Influenza, Bangladesh Livestock Research Institute, Savar, Dhaka, Bangladesh
| | - B K Nath
- Department of Dairy and Poultry Science, Chittagong Veterinary and Animal Sciences University, Chittagong, Bangladesh
| | - M Z Islam
- Department of Microbiology and Veterinary Public Health, Chittagong Veterinary and Animal Sciences University, Chittagong, Bangladesh
| | - N C Debnath
- Department of Microbiology and Veterinary Public Health, Chittagong Veterinary and Animal Sciences University, Chittagong, Bangladesh.,Emergency Centre for Transboundary Animal Diseases (ECTAD), Food and Agriculture Organization of the United Nation, Dhaka, Bangladesh
| | - M Yamage
- Emergency Centre for Transboundary Animal Diseases (ECTAD), Food and Agriculture Organization of the United Nation, Dhaka, Bangladesh
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Guguchia Z, Amato A, Kang J, Luetkens H, Biswas PK, Prando G, von Rohr F, Bukowski Z, Shengelaya A, Keller H, Morenzoni E, Fernandes RM, Khasanov R. Direct evidence for a pressure-induced nodal superconducting gap in the Ba0.65Rb0.35Fe2As2 superconductor. Nat Commun 2015; 6:8863. [PMID: 26548650 PMCID: PMC4667685 DOI: 10.1038/ncomms9863] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2015] [Accepted: 10/12/2015] [Indexed: 11/09/2022] Open
Abstract
The superconducting gap structure in iron-based high-temperature superconductors (Fe-HTSs) is non-universal. In contrast to other unconventional superconductors, in the Fe-HTSs both d-wave and extended s-wave pairing symmetries are close in energy. Probing the proximity between these very different superconducting states and identifying experimental parameters that can tune them is of central interest. Here we report high-pressure muon spin rotation experiments on the temperature-dependent magnetic penetration depth in the optimally doped nodeless s-wave Fe-HTS Ba0.65Rb0.35Fe2As2. Upon pressure, a strong decrease of the penetration depth in the zero-temperature limit is observed, while the superconducting transition temperature remains nearly constant. More importantly, the low-temperature behaviour of the inverse-squared magnetic penetration depth, which is a direct measure of the superfluid density, changes qualitatively from an exponential saturation at zero pressure to a linear-in-temperature behaviour at higher pressures, indicating that hydrostatic pressure promotes the appearance of nodes in the superconducting gap.
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Affiliation(s)
- Z Guguchia
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen, Switzerland
| | - A Amato
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen, Switzerland
| | - J Kang
- School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA
| | - H Luetkens
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen, Switzerland
| | - P K Biswas
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen, Switzerland
| | - G Prando
- Leibniz-Institut für Festkörper- und Werkstoffforschung (IFW) Dresden, D-01171 Dresden, Germany
| | - F von Rohr
- Physik-Institut der Universität Zürich, Winterthurerstrasse 190, CH-8057 Zürich, Switzerland
| | - Z Bukowski
- Institute of Low Temperature and Structure Research, Polish Academy of Sciences, 50-422 Wroclaw, Poland
| | - A Shengelaya
- Department of Physics, Tbilisi State University, Chavchavadze 3, GE-0128 Tbilisi, Georgia
| | - H Keller
- Physik-Institut der Universität Zürich, Winterthurerstrasse 190, CH-8057 Zürich, Switzerland
| | - E Morenzoni
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen, Switzerland
| | - Rafael M Fernandes
- School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA
| | - R Khasanov
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen, Switzerland
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Guha K, Fatema A, Biswas PK, Haque E. Isosorbide Mononitrate versus Misoprostol for Cervical Ripening and Induction of Labour at Term. Mymensingh Med J 2015; 24:346-351. [PMID: 26007264] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
To assess the efficacy and safety of isosorbide mononitrate (IMN) compared with misoprostol for cervical ripening and labour induction at term. In this comparative study two hundred term pregnant women with indication for induction of labour were randomly divided to receive either 40 mg IMN tablet vaginally (n=100) or 50 μg misoprostol tablet vaginally (n=100) every 6 hours interval for a maximum of 4 doses. Progress & outcome of cervical ripening, labour induction and adverse effects were assessed. Change in cervical score was higher in misoprostol group than IMN group. Time from start of medication to vaginal delivery in IMN group was significantly longer, 28.66 ± 5.283 hours, than in misoprostol group, 16.12 ± 5.581 hours. Vaginal delivery occurred in 77% in IMN group and 69% in misoprostol group. There were no tachysystole or uterine hyper stimulation in the IMN group while in misoprostol group it was 17% and 11% respectively. Maternal satisfaction was higher in IMN group. Cervical ripening is satisfactory with IMN. Though misoprostol is singly more effective than IMN but IMN with oxytocin results in more vaginal delivery. Fetal and maternal side effects are less in IMN group.
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Affiliation(s)
- K Guha
- Dr Kaberi Guha, Junior Consultant, Obstetrics & Gynaecology, Shaheed Suhrawardy Medical College Hospital, Sher-E-Bangla Nagar, Dhaka, Bangladesh; E-mail:
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Xu N, Biswas PK, Dil JH, Dhaka RS, Landolt G, Muff S, Matt CE, Shi X, Plumb NC, Radović M, Pomjakushina E, Conder K, Amato A, Borisenko SV, Yu R, Weng HM, Fang Z, Dai X, Mesot J, Ding H, Shi M. Direct observation of the spin texture in SmB6 as evidence of the topological Kondo insulator. Nat Commun 2014; 5:4566. [PMID: 25074332 DOI: 10.1038/ncomms5566] [Citation(s) in RCA: 175] [Impact Index Per Article: 17.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2014] [Accepted: 07/01/2014] [Indexed: 11/09/2022] Open
Abstract
Topological Kondo insulators have been proposed as a new class of topological insulators in which non-trivial surface states reside in the bulk Kondo band gap at low temperature due to strong spin-orbit coupling. In contrast to other three-dimensional topological insulators, a topological Kondo insulator is truly bulk insulating. Furthermore, strong electron correlations are present in the system, which may interact with the novel topological phase. By applying spin- and angle-resolved photoemission spectroscopy, here we show that the surface states of SmB6 are spin polarized. The spin is locked to the crystal momentum, fulfilling time reversal and crystal symmetries. Our results provide strong evidence that SmB6 can host topological surface states in a bulk insulating gap stemming from the Kondo effect, which can serve as an ideal platform for investigating of the interplay between novel topological quantum states with emergent effects and competing orders induced by strongly correlated electrons.
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Affiliation(s)
- N Xu
- Swiss Light Source, Paul Scherrer Institut, CH-5232 Villigen, Switzerland
| | - P K Biswas
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institut, CH-5232 Villigen, Switzerland
| | - J H Dil
- 1] Swiss Light Source, Paul Scherrer Institut, CH-5232 Villigen, Switzerland [2] Institute of Condensed Matter Physics, École Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland
| | - R S Dhaka
- 1] Swiss Light Source, Paul Scherrer Institut, CH-5232 Villigen, Switzerland [2] Institute of Condensed Matter Physics, École Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland
| | - G Landolt
- 1] Swiss Light Source, Paul Scherrer Institut, CH-5232 Villigen, Switzerland [2] Physik-Institut, Universität Zürich, Winterthurerstrauss 190, CH-8057 Zürich, Switzerland
| | - S Muff
- 1] Swiss Light Source, Paul Scherrer Institut, CH-5232 Villigen, Switzerland [2] Institute of Condensed Matter Physics, École Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland
| | - C E Matt
- 1] Swiss Light Source, Paul Scherrer Institut, CH-5232 Villigen, Switzerland [2] Laboratory for Solid State Physics, ETH Zürich, CH-8093, Zürich, Switzerland
| | - X Shi
- 1] Swiss Light Source, Paul Scherrer Institut, CH-5232 Villigen, Switzerland [2] Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
| | - N C Plumb
- Swiss Light Source, Paul Scherrer Institut, CH-5232 Villigen, Switzerland
| | - M Radović
- 1] Swiss Light Source, Paul Scherrer Institut, CH-5232 Villigen, Switzerland [2] SwissFEL, Paul Scherrer Institut, CH-5232 Villigen, Switzerland
| | - E Pomjakushina
- Laboratory for Developments and Methods, Paul Scherrer Institut, CH-5232 Villigen, Switzerland
| | - K Conder
- Laboratory for Developments and Methods, Paul Scherrer Institut, CH-5232 Villigen, Switzerland
| | - A Amato
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institut, CH-5232 Villigen, Switzerland
| | - S V Borisenko
- Institute for Solid State Research, IFW Dresden, PO Box 270116, D-01171 Dresden, Germany
| | - R Yu
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
| | - H-M Weng
- 1] Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China [2] Collaborative Innovation Center of Quantum Matter, Beijing 100084, China
| | - Z Fang
- 1] Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China [2] Collaborative Innovation Center of Quantum Matter, Beijing 100084, China
| | - X Dai
- 1] Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China [2] Collaborative Innovation Center of Quantum Matter, Beijing 100084, China
| | - J Mesot
- 1] Swiss Light Source, Paul Scherrer Institut, CH-5232 Villigen, Switzerland [2] Institute of Condensed Matter Physics, École Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland [3] Laboratory for Solid State Physics, ETH Zürich, CH-8093, Zürich, Switzerland
| | - H Ding
- 1] Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China [2] Collaborative Innovation Center of Quantum Matter, Beijing 100084, China
| | - M Shi
- Swiss Light Source, Paul Scherrer Institut, CH-5232 Villigen, Switzerland
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Roy K, Bertelsen MF, Pors SE, Johansen KW, Kristensen AT, Kjelgaard-Hansen M, Andreasen EB, Christensen JP, Biswas PK, Bojesen AM. Inflammation-induced haemostatic response in layer chickens infected with Streptococcus equi subsp. zooepidemicus as evaluated by fibrinogen, prothrombin time and thromboelastography. Avian Pathol 2014; 43:364-70. [PMID: 25017320 DOI: 10.1080/03079457.2014.938608] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
Streptococcus zooepidemicus has recently been shown to be a severe pathogen in layer chickens, where it is able to cause serious lesions in the vascular system. To evaluate the haemostatic response, 10 layer chickens were inoculated intravenously with S. zooepidemicus. Four hypotheses were tested: that the infection-induced inflammation would increase the plasma fibrinogen (Fbg) concentration, would prolong the prothrombin time (PT) and would prompt hypercoagulability or hypocoagulability as assessed by whole-blood thromboelastography (TEG), and that a possible correlation would exist between one of the TEG values and Fbg/PT. Each parameter was measured at days 1, 3 and 6 post inoculation (p.i.), and compared with the values at day 0 from each individual bird and with values obtained from non-infected control chickens (n = 10). In the infected chickens, the mean (± standard error) of Fbg was higher at day 3 p.i. (9.4 ± 1.4 g/l) and day 6 p.i. (8.0 ± 0.7 g/l) and the PT was prolonged at day 6 p.i. (168.1 ± 21.0 sec) compared with the day 0 standards (2.6 ± 0.2 g/l and 104.6 ± 2.0 sec, respectively) (P < 0.05). The majority of infected chickens demonstrated a hypercoagulable TEG result with increased mean values of the clot formation rate (α-angle) and maximal amplitude (MA) of TEG tracing at day 3 p.i. (83.1 ± 0.7°, 83.8 ± 1.4 mm) and day 6 p.i. (84.0 ± 0.4°, 89.8 ± 1.0 mm) compared with the day 0 values (75.8 ± 2.2° and 66.9 ± 1.4 mm, respectively) (P < 0.05). In control birds, the means of Fbg (1.5 ± 0.1 g/l), PT (79.4 ± 6.4 sec), TEG-α (76.7 ± 1.5°) and TEG-MA (64.0 ± 2.3 mm) were lower at day 6 compared with values observed for the infected chickens (P < 0.05). A negative correlation coefficient (-0.71) was found between the clot formation time (TEG-K) and Fbg at day 1 in the control group (P = 0.02). In conclusion, infection with S. zooepidemicus following intravenous injection in layer chickens induced haemostatic alterations including hyperfibrinogenaemia, prolonged PT, and hypercoagulability as measured by increased TEG-α and TEG-MA.
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Affiliation(s)
- Krisna Roy
- a Department of Veterinary Disease Biology, Faculty of Health and Medical Sciences , University of Copenhagen , Frederiksberg C, Copenhagen , Denmark
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Krzton-Maziopa A, Guguchia Z, Pomjakushina E, Pomjakushin V, Khasanov R, Luetkens H, Biswas PK, Amato A, Keller H, Conder K. Superconductivity in a new layered bismuth oxyselenide: LaO(0.5)F(0.5)BiSe₂. J Phys Condens Matter 2014; 26:215702. [PMID: 24805837 DOI: 10.1088/0953-8984/26/21/215702] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
We report superconductivity at T(c) ≈ 2.6 K in a new layered bismuth oxyselenide LaO(0.5)F(0.5)BiSe2 with the ZrCuSiAs-type structure composed of alternating superconducting BiSe2 and blocking LaO layers. The superconducting properties of LaO(0.5)F(0.5)BiSe2 were investigated by means of dc magnetization, resistivity and muon-spin rotation experiments, revealing the appearance of bulk superconductivity with a rather large superconducting volume fraction of ≈ 70% at 1.8 K.
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Affiliation(s)
- A Krzton-Maziopa
- Faculty of Chemistry, Warsaw University of Technology, Noakowskiego 3, 00-664 Warsaw, Poland
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Islam MZ, Musekiwa A, Islam K, Ahmed S, Chowdhury S, Ahad A, Biswas PK. Regional variation in the prevalence of E. coli O157 in cattle: a meta-analysis and meta-regression. PLoS One 2014; 9:e93299. [PMID: 24691253 PMCID: PMC3972218 DOI: 10.1371/journal.pone.0093299] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2013] [Accepted: 03/03/2014] [Indexed: 01/08/2023] Open
Abstract
BACKGROUND Escherichia coli O157 (EcO157) infection has been recognized as an important global public health concern. But information on the prevalence of EcO157 in cattle at the global and at the wider geographical levels is limited, if not absent. This is the first meta-analysis to investigate the point prevalence of EcO157 in cattle at the global level and to explore the factors contributing to variation in prevalence estimates. METHODS Seven electronic databases- CAB Abstracts, PubMed, Biosis Citation Index, Medline, Web of Knowledge, Scirus and Scopus were searched for relevant publications from 1980 to 2012. A random effect meta-analysis model was used to produce the pooled estimates. The potential sources of between study heterogeneity were identified using meta-regression. PRINCIPAL FINDINGS A total of 140 studies consisting 220,427 cattle were included in the meta-analysis. The prevalence estimate of EcO157 in cattle at the global level was 5.68% (95% CI, 5.16-6.20). The random effects pooled prevalence estimates in Africa, Northern America, Oceania, Europe, Asia and Latin America-Caribbean were 31.20% (95% CI, 12.35-50.04), 7.35% (95% CI, 6.44-8.26), 6.85% (95% CI, 2.41-11.29), 5.15% (95% CI, 4.21-6.09), 4.69% (95% CI, 3.05-6.33) and 1.65% (95% CI, 0.77-2.53), respectively. Between studies heterogeneity was evidenced in most regions. World region (p<0.001), type of cattle (p<0.001) and to some extent, specimens (p = 0.074) as well as method of pre-enrichment (p = 0.110), were identified as factors for variation in the prevalence estimates of EcO157 in cattle. CONCLUSION The prevalence of the organism seems to be higher in the African and Northern American regions. The important factors that might have influence in the estimates of EcO157 are type of cattle and kind of screening specimen. Their roles need to be determined and they should be properly handled in any survey to estimate the true prevalence of EcO157.
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Affiliation(s)
- Md. Zohorul Islam
- Department of Microbiology, Chittagong Veterinary and Animal Sciences University, Chittagong, Bangladesh
| | - Alfred Musekiwa
- School of Mathematics, Statistics and Computer Science, University of KwaZulu-Natal, Pietermaritzburg, South Africa
| | - Kamrul Islam
- Department of Microbiology, Chittagong Veterinary and Animal Sciences University, Chittagong, Bangladesh
| | - Shahana Ahmed
- Chittagong Veterinary Laboratory, Chittagong, Bangladesh
| | - Sharmin Chowdhury
- Department of Pathology and Parasitology, Chittagong Veterinary and Animal Sciences University, Chittagong, Bangladesh
| | - Abdul Ahad
- Department of Microbiology, Chittagong Veterinary and Animal Sciences University, Chittagong, Bangladesh
| | - Paritosh Kumar Biswas
- Department of Microbiology, Chittagong Veterinary and Animal Sciences University, Chittagong, Bangladesh
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Roy K, Kjelgaard-Hansen M, Pors SE, Christensen JP, Biswas PK, Bojesen AM. Performance of a commercial Chicken-Ovo-transferrin-ELISA on the serum of brown layer chickens infected with Gallibacterium anatis and Streptococcus zooepidemicus. Avian Pathol 2014; 43:57-61. [PMID: 24313352 DOI: 10.1080/03079457.2013.867011] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
To evaluate Ovo-transferrin (OTF), a positive acute-phase protein in chickens, as a diagnostic biomarker of selected bacterial infections we checked the performance of a commercial Chicken-OTF-ELISA (ICL, Inc., Portland, OR, USA) by analytical and overlap performances using two groups of serum samples obtained from 26 Gallibacterium anatis-infected and 20 Streptococcus zooepidemicus-infected brown layer chickens. In addition, sera from 14 apparently healthy and 19 negative control chickens were analysed in the Gallibacterium group whereas sera from 20 healthy and 11 negative control chickens from the Streptococcus group were analysed. All calibration curves revealed high coefficients of determination (≥ 0.97) between optical density (OD 450nm) and concentrations of OTF (mg/ml). OTF concentrations in high, medium and low pools (made of sera from a combination of infected and/or non-infected birds) were >6.4, >3.8 to <4.5 and <1.6 mg/ml in the Gallibacterium group, and >6.7, >3.5 to <3.7 and <1.1 mg/ml in the Streptococcus group, respectively. For each pool, low coefficients of intra-assay (7.8, 5.7 and 5.3) and inter-assay (15.8, 18.0 and 18.0) variations were obtained in the Gallibacterium study. In the Streptococcus study only the intra-assay variation was low (3.7, 3.8 and 6.2, respectively). The linearity check was acceptable demonstrating a straight line with slope and intercept, not deviating from one and zero, respectively, using the Gallibacterium sera, whereas the Streptococcus sera deviated from the linear line. Detection limits were low (Gallibacterium, 0.01 mg/ml; Streptococcus, 0.32 mg/ml). OTF concentrations (mean ± standard error of the mean) in overlap performances were elevated in the sera of infected chickens (Gallibacterium, 4.4 ± 0.3 mg/ml; Streptococcus, 3.2 ± 0.4 mg/ml) compared with negative controls (1.7 ± 0.1 mg/ml) (P < 0.05). In conclusion, the Chicken-OTF-ELISA can be used to measure reproducible serum OTF concentrations in brown layer chickens as a response to G. anatis infections, whereas an adjustment of dilution process is proposed to optimize to use in S. zooepidemicus-infected chickens.
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Affiliation(s)
- Krisna Roy
- a Department of Veterinary Disease Biology, Faculty of Health and Medical Sciences , University of Copenhagen , Frederiksberg C , Copenhagen , Denmark
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Barua H, Biswas PK, Talukder KA, Olsen KEP, Christensen JP. Poultry as a possible source of non-typhoidal Salmonella enterica serovars in humans in Bangladesh. Vet Microbiol 2013; 168:372-80. [PMID: 24355536 DOI: 10.1016/j.vetmic.2013.11.020] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2013] [Revised: 11/14/2013] [Accepted: 11/15/2013] [Indexed: 11/26/2022]
Abstract
We investigated Salmonella enterica isolates from human clinical cases of gastroenteritis to determine the distribution of non-typhoidal Salmonella serovars in the human population, and compared them to isolates originating from poultry by serotyping, phage typing, plasmid profiling, pulsed-field gel electrophoresis (PFGE) and multi-locus sequence typing (MLST) to evaluate the potential role of poultry in human non-typhoidal salmonellosis in Bangladesh. Nine different serovars were identified among the human isolates of which Salmonella Paratyphi B var Java (S. Java), S. Kentucky, S. Enteritidis, S. Virchow and S. Weltevreden also were commonly isolated from poultry. The poultry isolates belonging to S. Java, S. Kentucky and S. Enteritidis were indistinguishable from human isolates or genetically closely related, based on PFGE profiles and MLST. S. Kentucky clone ST198 and S. Java clone ST43 both well-known cause of human infections were also isolated from poultry.
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Affiliation(s)
- Himel Barua
- Department of Veterinary Disease Biology, Faculty of Health and Medical Sciences, University of Copenhagen, Stigbøjlen 4, 1870, Frederiksberg C, Denmark; Department of Microbiology, Faculty of Veterinary Medicine, Chittagong Veterinary and Animal Sciences University, Zakir Hossain Road, Khulshi, Chittagong, 4225, Bangladesh.
| | - Paritosh Kumar Biswas
- Department of Microbiology, Faculty of Veterinary Medicine, Chittagong Veterinary and Animal Sciences University, Zakir Hossain Road, Khulshi, Chittagong, 4225, Bangladesh
| | - Kaisar Ali Talukder
- Enteric and Food Microbiology Laboratory, International Centre for Diarrhoeal Disease Research, Mohakhali, Dhaka 1212, Bangladesh
| | - Katharina E P Olsen
- The National Reference Laboratory for Enteropathogenic Bacteria, Department of Microbiology and Infection Control, Statens Serum Institut, 5 Artillerivej, DK-2300, Copenhagen S, Denmark
| | - Jens Peter Christensen
- Department of Veterinary Disease Biology, Faculty of Health and Medical Sciences, University of Copenhagen, Stigbøjlen 4, 1870, Frederiksberg C, Denmark
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Roy K, Bisgaard M, Kyvsgaard NC, Christensen JP, Nielsen OL, Biswas PK, Pors SE, Bojesen AM. Pathogenicity of wild-type and small-colony variants of Streptococcus equi subsp. zooepidemicus in layer chickens. Avian Pathol 2013; 42:316-22. [PMID: 23721084 DOI: 10.1080/03079457.2013.798396] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
Wild-type (WT) and small-colony-variant (SCV) strains of Streptococcus equi subsp. zooepidemicus have recently been isolated from a layer flock in Denmark experiencing high mortality. To investigate the disease-causing potential of SCV compared with WT, a 2-week long infection study was performed in 45-week-old brown layer chickens. Four groups of 11 chickens each were inoculated with a WT or SCV strain by the intravenous or intra-tracheal route: WT-IV, SCV-IV or WT-IT, SCV-IT, respectively. Clinical signs were observed in most chickens in the WT-IV group (9/11). Mortality was observed in the SCV-IV (4/11) and WT-IV (2/11) groups. Ten chickens in the WT-IV and WT-IT groups, respectively, developed gross lesions including oophoritis/peritonitis, hepatitis and airsacculitis cervicalis. Bronchopneumonia was common in the SCV-IT group (6/11), and valvular endocarditis in the SCV-IV group (4/11). Histological lesions in liver tissue were frequently observed in the chickens of the SCV-IV group (9/11), followed by the WT-IT (7/11), WT-IV (6/11), and SCV-IT (2/11) groups. The lesions in the SCV-IV group were dominated by deposition of eosinophilic material with infiltration of inflammatory cells (6/9). Bacteriological re-isolation of either strain type was achieved from all chickens of the WT-IV and WT-IT groups, and from nine and seven out of 11 chickens for each of the SCV-IV and SCV-IT groups, respectively. In summary, we were able to reproduce clinical signs and lesions as observed during the natural outbreak, which included an overall initial onset in WT-infected chickens as opposed to a late onset and possible recurring infection seen in the SCV-infected chickens.
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Affiliation(s)
- Krisna Roy
- Department of Veterinary Disease Biology, Faculty of Health and Medical Sciences, University of Copenhagen Frederiksberg C, Denmark
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Biswas PK, Krzton-Maziopa A, Khasanov R, Luetkens H, Pomjakushina E, Conder K, Amato A. Two-dimensional superfluid density in an alkali metal-organic solvent intercalated iron selenide superconductor Li(C5H5N)0.2Fe2Se2. Phys Rev Lett 2013; 110:137003. [PMID: 23581361 DOI: 10.1103/physrevlett.110.137003] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/21/2012] [Revised: 12/30/2012] [Indexed: 06/02/2023]
Abstract
We report the low-temperature electronic and magnetic properties of the alkali metal-organic solvent intercalated iron selenide superconductor Li(C5H5N)0.2Fe2Se2 using muon-spin-spectroscopy measurements. The zero-field muon spin relaxation (μSR) results indicate that nearly half of the sample is magnetically ordered and spatially phase separated from the superconducting region. The transverse-field μSR results reveal that the superfluid density of Li(C5H5N)0.2Fe2Se2 is two dimensional in nature. The temperature dependence of the penetration depth λ(T) can be explained using a two-gap s-wave model. This implies that, despite the 2D nature of the superfluid density, the symmetry of the superconducting gap remains unaltered to the parent compound FeSe.
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Affiliation(s)
- P K Biswas
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland.
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Biswas PK, Christensen JP, Ahmed SSU, Barua H, Das A, Rahman MH, Giasuddin M, Habib MA, Hannan ASMA, Debnath NC. Mortality rate and clinical features of highly pathogenic avian influenza in naturally infected chickens in Bangladesh. REV SCI TECH OIE 2013; 30:871-8. [PMID: 22435197 DOI: 10.20506/rst.30.3.2080] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
A retrospective study was performed to assess the mortality rates and clinical signs in commercial and backyard chickens naturally infected with the highly pathogenic avian influenza (HPAI) H5N1 virus in Bangladesh. All of the 33 commercial and 25 backyard farms, recorded during the first wave of HPAI outbreaks (January to November 2007) in Bangladesh, were enrolled in this study. The farm profile data, stock information and major clinical signs recognised by the farmers and/or farm attendants, were collected through a prototype questionnaire. The investigating veterinarians' retrospective appraisals of the clinical signs were recorded by interview. After the clinical onset, the incidence rates of mortality in breeder, commercial broiler, commercial layer and backyard chickens were, respectively: 0.0215, 0.0341, 0.0179 and 0.0703 per chicken-day at risk. The four major clinical signs observed were cyanotic combs and wattles, oedema of the head and face, drowsiness and huddling and ecchymotic discoloration of the leg shanks. The first sign (cyanotic combs and wattles) was equally observed in chickens from commercial and backyard farms (p = 0.44) but the second (oedema of the head and face) was more common in backyard farms (p = 0.03).
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Affiliation(s)
- P K Biswas
- Department of Microbiology, Chittagong Veterinary and Animal Sciences University, Khulshi, Chittagong, Bangladesh.
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Ahmed SSU, Themudo GE, Christensen JP, Biswas PK, Giasuddin M, Samad MA, Toft N, Ersbøll AK. Molecular epidemiology of circulating highly pathogenic avian influenza (H5N1) virus in chickens, in Bangladesh, 2007-2010. Vaccine 2012; 30:7381-90. [PMID: 23063840 DOI: 10.1016/j.vaccine.2012.09.081] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2011] [Revised: 04/24/2012] [Accepted: 09/28/2012] [Indexed: 10/27/2022]
Abstract
Bangladesh has been severely hit by highly pathogenic avian influenza H5N1 (HPAI-H5N1). However, little is known about the genetic diversity and the evolution of the circulating viruses in Bangladesh. In the present study, we analyzed the hemagglutinin gene of 30 Bangladeshi chicken isolates from 2007 through 2010. We analyzed the polybasic amino acid sequence motif of the cleavage site and amino acid substitution pattern. Phylogenetic history was reconstructed using neighbor-joining and Bayesian time-scaled methods. In addition, we used Mantel correlation tests to analyze the relation between genetic relatedness and spatial and temporal distances. Neighbor-joining phylogeography revealed that virus circulating in Bangladesh from 2007 through 2010 belonged to clade 2.2. The results suggest that clade 2.2 viruses are firmly entrenched and have probably become endemic in Bangladesh. We detected several amino acid substitutions, but they are not indicative of adaptation toward human infection. The Mantel correlation test confirmed significant correlation between genetic distances and temporal distances between the viruses. The Bayesian tree shows that isolates from waves 3 and 4 derived from a subgroup of isolates from the previous waves grouping with a high posterior probability (pp=1.0). This indicates the possibility of formation of local subclades. One surprising finding of spatio-temporal analysis was that genetically identical virus caused independent outbreaks over a distance of more than 200 km and within 14 days of each other. This might indicate long distance dispersal through vectors such as migratory birds and vehicles, and challenges the effectiveness of movement restriction around 10 km radius of an outbreak. The study indicates possible endemicity of the clade 2.2 HPAI-H5N1 virus in Bangladesh. Furthermore, the formation of a subclade capable of transmission to humans cannot be ruled out. The findings of this study might provide valuable information for future surveillance, prevention and control programme.
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Affiliation(s)
- Syed Sayeem Uddin Ahmed
- University of Copenhagen, Faculty of Life Sciences, Department of Large Animal Sciences, Grønnegårdsvej 8, DK-1870 Frederiksberg C, Denmark.
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Abolfath RM, Biswas PK, Rajnarayanam R, Brabec T, Kodym R, Papiez L. Multiscale QM/MM molecular dynamics study on the first steps of guanine damage by free hydroxyl radicals in solution. J Phys Chem A 2012; 116:3940-5. [PMID: 22397677 PMCID: PMC3356683 DOI: 10.1021/jp300258n] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Understanding the damage of DNA bases from hydrogen abstraction by free OH radicals is of particular importance to understanding the indirect effect of ionizing radiation. Previous studies address the problem with truncated DNA bases as ab initio quantum simulations required to study such electronic-spin-dependent processes are computationally expensive. Here, for the first time, we employ a multiscale and hybrid quantum mechanical-molecular mechanical simulation to study the interaction of OH radicals with a guanine-deoxyribose-phosphate DNA molecular unit in the presence of water, where all of the water molecules and the deoxyribose-phosphate fragment are treated with the simplistic classical molecular mechanical scheme. Our result illustrates that the presence of water strongly alters the hydrogen-abstraction reaction as the hydrogen bonding of OH radicals with water restricts the relative orientation of the OH radicals with respect to the DNA base (here, guanine). This results in an angular anisotropy in the chemical pathway and a lower efficiency in the hydrogen-abstraction mechanisms than previously anticipated for identical systems in vacuum. The method can easily be extended to single- and double-stranded DNA without any appreciable computational cost as these molecular units can be treated in the classical subsystem, as has been demonstrated here.
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Affiliation(s)
- Ramin M Abolfath
- School of Natural Sciences and Mathematics, University of Texas at Dallas, Richardson, Texas 75080, USA.
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Biswas PK, Lees MR, Balakrishnan G, Liao DQ, Keeble DS, Gavilano JL, Egetenmeyer N, Dewhurst CD, Paul DM. First-order reorientation transition of the flux-line lattice in CaAlSi. Phys Rev Lett 2012; 108:077001. [PMID: 22401241 DOI: 10.1103/physrevlett.108.077001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/25/2011] [Indexed: 05/31/2023]
Abstract
The flux-line lattice in CaAlSi has been studied by small-angle neutron scattering. A well-defined hexagonal flux-line lattice is seen just above H(c1) in an applied field of only 54 Oe. A 30° reorientation of this vortex lattice has been observed in a very low field of 200 Oe. This reorientation transition appears to be first-order and could be explained by nonlocal effects. The magnetic field dependence of the form factor is well-described by a single penetration depth of λ=1496(1) Å and a single coherence length of ξ=307(1) Å at 2 K. At 1.5 K, the penetration depth anisotropy is γ(λ)=2.7(1), with the field applied perpendicular to the c axis, and agrees with the coherence length anisotropy determined from critical field measurements.
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Affiliation(s)
- P K Biswas
- Physics Department, University of Warwick, Coventry, United Kingdom.
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Sardar K, Hong J, Catalan G, Biswas PK, Lees MR, Walton RI, Scott JF, Redfern SAT. Structural, spectroscopic, magnetic and electrical characterization of Ca-doped polycrystalline bismuth ferrite, Bi(1-x)Ca(x)FeO(3-x/2) (x ≤ 0.1). J Phys Condens Matter 2012; 24:045905. [PMID: 22214552 DOI: 10.1088/0953-8984/24/4/045905] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
The crystal structure and physical properties of multiferroic polycrystalline Ca(2+)-doped BiFeO(3) samples have been investigated. The present experimental investigation suggests that Bi(1-x)Ca(x)FeO(3-x/2) (x ≤ 0.1) can be considered as a solid solution between BiFeO(3) and CaFeO(2.5). The oxidation state of Fe in these materials is + 3 and charge balance occurs through the creation of oxygen vacancies. For each composition, two structural phase transitions are revealed as anomalies in the variable-temperature in situ x-ray diffraction data which is consistent with the well-established high-temperature structural transformation in pure BiFeO(3). All compositions studied show antiferromagnetic behaviour along with a ferromagnetic component that increases with Ca(2+) doping. The resistivities of the Bi(1-x)Ca(x)FeO(3-x/2) samples at room temperature are of the order of 10(9) Ω cm and decrease with increasing Ca(2+) content. Arrhenius plots of the resistivity show two distinct linear regions with activation energies in the range of 0.4-0.7 and 0.03-0.16 eV. A correlation has been established between the critical temperatures associated with the structural phase transitions and the multiferroic properties. A composition of x = 0.085 is predicted to show maximum magneto-electric coupling.
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Biswas PK, Rahman MH, Das A, Ahmed SSU, Giasuddin M, Christensen JP. Risk for highly pathogenic avian influenza H5N1 virus infection in chickens in small-scale commercial farms, in a high-risk area, Bangladesh, 2008. Transbound Emerg Dis 2011; 58:519-25. [PMID: 21645286 DOI: 10.1111/j.1865-1682.2011.01235.x] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Small-scale commercial chicken farms (FAO-defined system 3) with poor biosecurity predominate in developing countries including Bangladesh. By enroling fifteen highly pathogenic avian influenza (HPAI) cases occurring in such farms - (February - April 2008) and 45 control farms (March-May 2008) with similar set up, we conducted a case-control study to evaluate the risk factors associated with HPAI H5N1 virus infections in chickens reared in small-scale commercial farms in a spatially high-risk area in Bangladesh. Data collected by a questionnaire from the selected farms were analysed by univariable analysis and multivariable conditional logistic regression. The risk factors independently associated were 'dead crow seen at or near farm' [odds ratio (OR) 47.4, 95% confidence interval (CI) 4.7-480.3, P = 0.001], 'exchanging eggtrays with market vendors' (OR 20.4, 95% CI 1.9-225.5, P = 0.014) and 'mortality seen in backyard chicken reared nearby' (OR 19.4, 95% CI 2.8-131.9, P = 0.002). These observations suggest that improved biosecurity might reduce the occurrence of HPAI outbreaks in small-scale commercial farms in Bangladesh.
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Affiliation(s)
- P K Biswas
- Department of Microbiology, Chittagong Veterinary and Animal Sciences University, Khulshi, Bangladesh.
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Biswas PK. Carcinoma gallbladder. Mymensingh Med J 2010; 19:477-481. [PMID: 20639849] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
Carcinoma gallbladder (CaGb) is a rare disease. The aetiology of CaGb is yet not known. However the risk of CaGb is increased in anomalous pancreaticobiliary duct junction (APBDJ), gall stones, xanthogranulomatus cholecystitis, calcified or porcelain gallbladder, cholelithiasis with typhoid carriers, gallbladder adenoma, red meat consumption and tobacco uses. There are protective effects of vegetables on CaGb. Most of the cases present with advanced disease. In early carcinoma of a gallbladder sign and symptoms mimic benign disease. The diagnosis is established by ultrasonography, computerized tomography and guided fine needle aspiration cytology (FNAC). Biochemical tests are of very little value in making a diagnosis. The treatment depends on the clinical stage at presentation. Surgery offers the best chance of cure. In stage T1a, laparoscopic or open cholecystectomy alone is curative, and in T1b, cholecystectomy with hepatoduodenal lymph node dissection without combined resection of an adjacent organ is required. Segment S4a+5 hepatectomy combined with extrahepatic bile duct resection (BDR) and D2 lymph node dissection is a highly recommended operation for the treatment of T2 and T3 CaGb. The dye injection method is useful in determining the appropriate extent of hepatic resection for advanced CaGb. Resurgery is required only in those cases where tumour has invaded the serosa and/ or adjacent structures when diagnosed postoperatively. Biliary bypass is required for palliation. Prognosis depends on early diagnosis and appropriate surgical excision.
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Affiliation(s)
- P K Biswas
- Probodh Kumar Biswas, FCPS (Surgery), Consultant Surgeon, Upazila Health Complex, Godagari (Premtoli), Rajshahi
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Biswas PK, Christensen JP, Ahmed SSU, Barua H, Das A, Rahman MH, Giasuddin M, Hannan ASMA, Habib AM, Debnath NC. Risk factors for infection with highly pathogenic influenza A virus (H5N1) in commercial chickens in Bangladesh. Vet Rec 2009; 164:743-6. [PMID: 19525522 DOI: 10.1136/vr.164.24.743] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
A matched case-control study was carried out to identify risk factors for highly pathogenic avian influenza A virus (subtype H5N1) infection in commercial chickens in Bangladesh. A total of 33 commercial farms diagnosed with H5N1 before September 9, 2007, were enrolled as cases, and 99 geographically matched unaffected farms were enrolled as control farms. Farm data were collected using a pretested questionnaire, and analysed by matched-pair analysis and multivariate conditional logistic regression. Two factors independently and positively associated with H5N1 infection remained in the final model. They were 'farm accessible to feral and wild animals' (odds ratio [OR] 5.71, 95 per cent confidence interval [CI] 1.81 to 18.0, P=0.003) and 'footbath at entry to farm/shed' (OR 4.93, 95 per cent CI 1.61 to 15.1, P=0.005). The use of a designated vehicle for sending eggs to a vendor or market appeared to be a protective factor (OR 0.14, 95 per cent CI 0.02 to 0.88, P=0.036).
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Affiliation(s)
- P K Biswas
- Department of Microbiology, Veterinary and Animal Sciences University, Chittagong, Bangladesh.
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