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Kawabata H, Miyazawa N, Matsuda Y, Satobe M, Mizogami Y, Kuriyama Y, Sakai T, Mori M, Sasa M. Measurement of serum hepcidin-25 by latex agglutination in healthy volunteers and patients with hematologic disorders. Int J Hematol 2024; 119:392-398. [PMID: 38372875 DOI: 10.1007/s12185-024-03720-4] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2023] [Revised: 01/17/2024] [Accepted: 01/18/2024] [Indexed: 02/20/2024]
Abstract
Iron is an essential trace metal, vital for various physiologic processes, but excess levels can harm health. Maintaining iron homeostasis is critical, with hepcidin playing a key role. The isoform hepcidin-25 exerts the most significant influence on iron metabolism, making its serum levels a valuable diagnostic tool. However, mass-spectrometry and other conventional measurement methods can be difficult to perform, and some immunoassays lack reliability. In this study, we employed a recently developed latex agglutination method integrated with a readily available automated analyzer to quantify serum hepcidin-25 levels in both volunteers recruited from personnel of our hospital (n = 93) and patients with various hematological disorders (n = 112). Our findings unveiled a robust positive correlation between serum hepcidin-25 and ferritin, as well as C-reactive protein levels, in both volunteers and patients. Among the patients with hematological disorders, there was a noteworthy negative correlation between hepcidin-25 levels and hemoglobin concentrations, as well as reticulocyte counts. Interestingly, the hepcidin-25/ferritin ratio was remarkably low in patients with hemolytic anemia and myelodysplastic syndromes with ring sideroblasts. Our findings suggest that quantifying serum hepcidin-25 and the hepcidin-25/ferritin ratio using this method may be valuable for screening of hematopoietic diseases and other iron metabolism disorders.
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Affiliation(s)
- Hiroshi Kawabata
- Department of Hematology, NHO Kyoto Medical Center, 1-1 Fukakusa Mukaihata-Cho, Fushimi-Ku, Kyoto, 612-8555, Japan.
- Department of Clinical Laboratory, NHO Kyoto Medical Center, Kyoto, Japan.
| | - Naoki Miyazawa
- Department of Clinical Laboratory, NHO Kyoto Medical Center, Kyoto, Japan
| | - Yumi Matsuda
- Department of Clinical Laboratory, NHO Kyoto Medical Center, Kyoto, Japan
| | - Misaki Satobe
- Department of Clinical Laboratory, NHO Kyoto Medical Center, Kyoto, Japan
| | - Yasushi Mizogami
- Department of Clinical Laboratory, NHO Kyoto Medical Center, Kyoto, Japan
| | - Yoko Kuriyama
- Department of Clinical Laboratory, NHO Kyoto Medical Center, Kyoto, Japan
| | - Tomomi Sakai
- Department of Hematology, NHO Kyoto Medical Center, 1-1 Fukakusa Mukaihata-Cho, Fushimi-Ku, Kyoto, 612-8555, Japan
| | - Minako Mori
- Department of Hematology, NHO Kyoto Medical Center, 1-1 Fukakusa Mukaihata-Cho, Fushimi-Ku, Kyoto, 612-8555, Japan
| | - Michio Sasa
- Department of Clinical Laboratory, NHO Kyoto Medical Center, Kyoto, Japan
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Khangai A, Akada J, Saruuljavkhlan B, Gantuya B, Azzaya D, Oyuntsetseg K, Davaadorj D, Uchida T, Matsumoto T, Yamaoka Y. Utilization of an Automated Latex Agglutination Turbidity Assay for Assessing Gastric Mucosal Alteration during Helicobacter pylori Infection. Gut Liver 2024; 18:60-69. [PMID: 37720994 PMCID: PMC10791506 DOI: 10.5009/gnl220464] [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] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/27/2022] [Revised: 01/21/2023] [Accepted: 02/07/2023] [Indexed: 09/19/2023] Open
Abstract
Background/Aims : A latex agglutination turbidity (LA) assay to test for serum antibodies has been approved in Japan and Korea for mass screening of Helicobacter pylori infection. In this study, we evaluated the LA assay for diagnosing H. pylori infection and predicting gastric mucosal changes in a Mongolian population. Methods : In total, 484 individuals were classified into H. pylori-positive (n=356) and H. pylori-negative (n=128) groups, as determined by histology and H. pylori culture. Results : The best cutoff, sensitivity, and specificity values for the LA assay were 18.35 U/mL, 74.2%, and 65.6%, respectively. The LA values in the atrophic gastritis group were statistically higher than those in the other groups (healthy, chronic gastritis, intestinal metaplasia, and gastric cancer, p<0.0001). The cutoff value to distinguish the atrophic gastritis group from the other four groups was 32.0 U/mL, and its area under the curve was 0.673, which was the highest among the E-plate, pepsinogen (PG) I, PG II, and PG I/II ratio tests in our data. The odds ratios for atrophic gastritis determined by the LA assay and PG I test in multiple logistic regression were 2.5 and 1.9, respectively, which were significantly higher than for the other tests. Conclusions : The LA assay can determine the risk of atrophic gastritis, which in turn is a considerable risk factor for gastric cancer. We propose using this assay in combination with the PG I/II ratio to avoid missing gastric cancer patients who have a low LA value (less than 32.0 U/mL).
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Affiliation(s)
- Ayush Khangai
- Department of Environmental and Preventive Medicine, Oita University Faculty of Medicine, Yufu, Japan
- The Gastroenterology Center, The First Central Hospital of Mongolia, Ulaanbaatar, Mongolia
| | - Junko Akada
- Department of Environmental and Preventive Medicine, Oita University Faculty of Medicine, Yufu, Japan
| | - Batsaikhan Saruuljavkhlan
- Department of Environmental and Preventive Medicine, Oita University Faculty of Medicine, Yufu, Japan
| | - Boldbaatar Gantuya
- Department of Gastroenterology, Mongolian National University of Medical Sciences, Ulaanbaatar, Mongolia
- Endoscopy Unit, Mongolia-Japan Teaching Hospital, Mongolian National University of Medical Sciences, Ulaanbaatar, Mongolia
| | - Dashdorj Azzaya
- Department of Gastroenterology, Mongolian National University of Medical Sciences, Ulaanbaatar, Mongolia
- Endoscopy Unit, Mongolia-Japan Teaching Hospital, Mongolian National University of Medical Sciences, Ulaanbaatar, Mongolia
| | - Khasag Oyuntsetseg
- Department of Gastroenterology, Mongolian National University of Medical Sciences, Ulaanbaatar, Mongolia
- Endoscopy Unit, Mongolia-Japan Teaching Hospital, Mongolian National University of Medical Sciences, Ulaanbaatar, Mongolia
| | - Duger Davaadorj
- Department of Gastroenterology, Mongolian National University of Medical Sciences, Ulaanbaatar, Mongolia
- Endoscopy Unit, Mongolia-Japan Teaching Hospital, Mongolian National University of Medical Sciences, Ulaanbaatar, Mongolia
| | - Tomohisa Uchida
- Department of Advanced Medical Sciences, Oita University Faculty of Medicine, Oita, Japan
| | - Takashi Matsumoto
- Department of Environmental and Preventive Medicine, Oita University Faculty of Medicine, Yufu, Japan
| | - Yoshio Yamaoka
- Department of Environmental and Preventive Medicine, Oita University Faculty of Medicine, Yufu, Japan
- Research Center for Global and Local Infectious Diseases (RCGLID), Oita University, Oita, Japan
- Department of Medicine, Gastroenterology and Hepatology Section, Baylor College of Medicine, Houston, TX, USA
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Gonzales BL, Andrade DA, Valdivia CA, Ho-Palma AC, Munguia A, Yucra D, Escobedo M, Crotta M, Limon G, Gonzalez A, Guitian J, Gonzales-Gustavson E. Detection and Isolation of Escherichia coli O157:H7 in Beef from Food Markets and Fecal Samples of Dairy Calves in the Peruvian Central Highlands. Am J Trop Med Hyg 2023; 109:568-570. [PMID: 37487566 PMCID: PMC10484278 DOI: 10.4269/ajtmh.23-0181] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2023] [Accepted: 06/12/2023] [Indexed: 07/26/2023] Open
Abstract
Shiga toxin-producing Escherichia coli (STEC) O157:H7 is a food and waterborne pathogen with severe public health implications. We report the first-time isolation of this pathogen in the Central Highlands of Peru through standardized culture procedures and polymerase chain reaction (PCR). Escherichia coli strains were cultured from rectal-anal swabs from dairy calves and beef from food markets. The latex agglutination test was used to detect O157 and H7 antigens, and multiplex real-time PCR was carried out to detect virulence-related genes. The STEC O157:H7 strains were isolated from 3.5% (1/28) of beef samples and from 6.0% (3/50) of dairy calves that also carried both eaeA and stx1 genes. Therefore, this pathogen is a potential cause of food/waterborne disease in the region, and its surveillance in both livestock and their products should be improved to characterize the impact of its zoonotic transmission. From 2010 to 2020, E. coli was suspected in 10 outbreaks reported to the Peruvian Ministry of Health. Isolates from future outbreaks should be characterized to assess the burden posed by STEC O157:H7 in Peru.
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Affiliation(s)
- Brenda L. Gonzales
- Department of Animal and Public Health, School of Veterinary Medicine, Universidad Nacional Mayor de San Marcos, Lima, Peru
- Tropical and Highlands Veterinary Research Institute, Universidad Nacional Mayor de San Marcos, Jauja, Peru
| | - Daniel A. Andrade
- Department of Animal and Public Health, School of Veterinary Medicine, Universidad Nacional Mayor de San Marcos, Lima, Peru
- Tropical and Highlands Veterinary Research Institute, Universidad Nacional Mayor de San Marcos, Jauja, Peru
| | - Cesar A. Valdivia
- Department of Animal and Public Health, School of Veterinary Medicine, Universidad Nacional Mayor de San Marcos, Lima, Peru
- Tropical and Highlands Veterinary Research Institute, Universidad Nacional Mayor de San Marcos, Jauja, Peru
| | - Ana C. Ho-Palma
- Department of Human Medicine, School of Human Medicine, Universidad Nacional del Centro del Perú, Huancayo, Peru
| | - Astrid Munguia
- Department of Animal and Public Health, School of Veterinary Medicine, Universidad Nacional Mayor de San Marcos, Lima, Peru
| | - Dora Yucra
- Faculty of Veterinary Medicine and Zootechnics, Universidad Nacional Micaela Bastidas de Apurímac, Abancay, Peru
| | - Max Escobedo
- Faculty of Veterinary Medicine and Zootechnics, Universidad Nacional Micaela Bastidas de Apurímac, Abancay, Peru
| | - Matteo Crotta
- Veterinary Epidemiology, Economics and Public Health Group, Department of Pathobiology and Population Sciences, The Royal Veterinary College, Hertfordshire, United Kingdom
| | - Georgina Limon
- Veterinary Epidemiology, Economics and Public Health Group, Department of Pathobiology and Population Sciences, The Royal Veterinary College, Hertfordshire, United Kingdom
| | - Armando Gonzalez
- Department of Animal and Public Health, School of Veterinary Medicine, Universidad Nacional Mayor de San Marcos, Lima, Peru
| | - Javier Guitian
- Veterinary Epidemiology, Economics and Public Health Group, Department of Pathobiology and Population Sciences, The Royal Veterinary College, Hertfordshire, United Kingdom
| | - Eloy Gonzales-Gustavson
- Department of Animal and Public Health, School of Veterinary Medicine, Universidad Nacional Mayor de San Marcos, Lima, Peru
- Tropical and Highlands Veterinary Research Institute, Universidad Nacional Mayor de San Marcos, Jauja, Peru
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Ivanov PA, Lyashko AV, Ionov SA, Shcherbinin DN, Rudneva IA, Shilov AA, Bunkova NI, Shmarov MM, Timofeeva TA. [Latex Agglutination as an Alternative to the Hemagglutination Reaction of Influenza Viruses]. Mol Biol (Mosk) 2023; 57:898-906. [PMID: 37752655 DOI: 10.31857/s0026898423040092, edn: qlotlj] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2022] [Accepted: 02/12/2023] [Indexed: 09/28/2023]
Abstract
As an alternative to the classical method of erythrocyte hemagglutination, a latex agglutination assay based on the interaction of influenza viruses with the sialoglycoprotein fetuin immobilized on the surface of polystyrene microspheres has been developed. Twelve influenza A virus strains of different subtypes and two influenza B viruses of different lines were tested. Simultaneous titration of viruses using the classical hemagglutination test and the proposed latex agglutination assay showed similar sensitivity and a high degree of correlation (R = 0.94). The obtained microspheres can be used for titration of viruses that recognize and bind sialylated glycans as receptors. In particular, latex aggregation was also induced by the Newcastle disease virus.
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Affiliation(s)
- P A Ivanov
- National Research Center for Epidemiology and Microbiology named after the Academician N.F Gamalei, Moscow, 123098 Russia
- Winogradsky Institute of Microbiology RC Biotechnology, Russian Academy of Sciences, Moscow, 117312 Russia
| | - A V Lyashko
- National Research Center for Epidemiology and Microbiology named after the Academician N.F Gamalei, Moscow, 123098 Russia
| | - S A Ionov
- National Research Center for Epidemiology and Microbiology named after the Academician N.F Gamalei, Moscow, 123098 Russia
- Mendeleev University of Chemical Technology, Moscow, 117312 Russia
| | - D N Shcherbinin
- National Research Center for Epidemiology and Microbiology named after the Academician N.F Gamalei, Moscow, 123098 Russia
| | - I A Rudneva
- National Research Center for Epidemiology and Microbiology named after the Academician N.F Gamalei, Moscow, 123098 Russia
| | - A A Shilov
- National Research Center for Epidemiology and Microbiology named after the Academician N.F Gamalei, Moscow, 123098 Russia
| | - N I Bunkova
- National Research Center for Epidemiology and Microbiology named after the Academician N.F Gamalei, Moscow, 123098 Russia
| | - M M Shmarov
- National Research Center for Epidemiology and Microbiology named after the Academician N.F Gamalei, Moscow, 123098 Russia
- Sechenov First Moscow State University, Moscow, 101000 Russia
| | - T A Timofeeva
- National Research Center for Epidemiology and Microbiology named after the Academician N.F Gamalei, Moscow, 123098 Russia
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Dantas KC, de Freitas—Xavier RS, Spina Lombardi SCF, Júnior AM, da Silva MV, Criado PR, de Freitas VLT, de Almeida TMB. Comparative analysis of diagnostic methods for the detection of Cryptococcus neoformans meningitis. PLoS Negl Trop Dis 2023; 17:e0011140. [PMID: 36877731 PMCID: PMC10019727 DOI: 10.1371/journal.pntd.0011140] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2022] [Revised: 03/16/2023] [Accepted: 02/05/2023] [Indexed: 03/07/2023] Open
Abstract
BACKGROUND Cryptococcosis is a devastating opportunistic infection in immunocompromised individuals, primarily in people living with HIV/AIDS. This study evaluated a protocol for the early diagnosis of meningitis due to C. neoformans, utilizing established molecular techniques from serum and CSF samples. METHODS The 18S and 5.8S (rDNA-ITS) sequence-specific nested PCR assays were compared with direct India ink staining and the latex agglutination test for detection of C. neoformans in serum and cerebrospinal fluid (CSF) from 49 Brazilian suspected meningitis patients. Results were validated with samples obtained from 10 patients negative for cryptococcosis and HIV, and by analysis of standard C. neoformans strains. PRINCIPAL FINDINGS The 5.8S DNA-ITS PCR was more sensitive (89-100%) and specific (100%) than the 18S rDNA PCR and conventional tests (India ink staining and latex agglutination) for identification of C. neoformans. While the 18S PCR exhibited a sensitivity (72%) similar to that of the latex agglutination assay in serum samples, it was superior to the latex agglutination assay when testing CSF, with a sensitivity of 84%. However, the latex agglutination was superior to the 18SrDNA PCR in specificity in CSF (92%). The 5.8S DNA-ITS PCR yielded the highest levels of accuracy (96-100%) of any test for detection (serological and mycological) of C. neoformans in both serum and CSF. CONCLUSION Use of the nested 5.8S PCR was superior to other techniques for the diagnosis of cryptococcosis. The possibility of using serum, a non-invasively collected material, in a targeted 5.8S PCR analysis to identify Cryptococcus spp. is recommended, especially in immunosuppressed patients. Our results indicate that nested 5.8S PCR can increase the diagnostic capability of cryptococcosis, and we suggest its use to monitor patients in the future.
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Affiliation(s)
- Katia Cristina Dantas
- Department of Pathology, Sao Paulo University Medical School, Sao Paulo, Brazil
- * E-mail:
| | | | | | - Alfredo Mendroni Júnior
- Laboratory of Medical Investigation in Pathogenesis and Targeted Therapy in OncoImmuno-Hematology (LIM-31), Department of Hematology, Hospital das Clínicas -HCFMUSP, Faculty of Medicine, University of São Paulo, São Paulo, Brazil
| | - Marcos Vinicius da Silva
- Emilio Ribas Institute of Infectious Diseases, Consultant, Ministry of Health, Department of Medicine, Catholic University of Sao Paulo, and Professor, Program in Postgraduate Sciences and Coordination of Disease Control, Department of State Health, São Paulo, Brazil
| | | | - Vera Lúcia Teixeira de Freitas
- Laboratory of Medical Investigation in Imunology (LIM-48), Department of Infectious and Parasitic Diseases, Sao Paulo University Medical School, Sao Paulo, Brazil
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Shah P, Sah R, Sharma A, Khanal B, Bhattarai NR. Evaluation of Latex Agglutination Test for Rapid Identification of Staphylococcus aureus Isolated from Pyogenic Wound Infections at a Tertiary Care Hospital. Kathmandu Univ Med J (KUMJ) 2023; 21:13-16. [PMID: 37800419] [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: 10/07/2023]
Abstract
Background Staphylococcus aureus infections are increasingly reported worldwide. It is a major clinical problem and imposes significant morbidity and mortality due to widespread emergence of multidrug resistant pathogens like methicillin resistant Staphylococcus aureus. Thus, rapid and reliable identification of Staphylococcus aureus is essential for timely and effective management of patient. Objective The performance of Latex agglutination test (Staphaurex Plus) was compared to conventional method tube coagulase test which is gold standard too for the identification of Staphylococcus aureus. Method This study was conducted at B.P. Koirala Institute of Health Sciences. Following standard microbiological methods, isolation and identification was done in the Department of Microbiology. MRSA detection was performed following Clinical and Laboratory Standard Institute. All the isolates of Staphylococci were subjected for Latex agglutination test and was performed according to manufacturer's instructions using Staphaurex Plus kit. Result Out of 377 (methicillin sensitive Staphylococcus aureus - 142; methicillin resistant Staphylococcus aureus - 233; Coagulase Negative Staphylococci -2) isolates of Staphylococci, Latex agglutination test was found to be positive in 138 (97.1%) of methicillin sensitive Staphylococcus aureus (MSSA) and 220 (94.4%) of methicillin resistant Staphylococcus aureus (MRSA). Overall sensitivity, specificity, positive predictive value and negative predictive value of Latex agglutination test was found to be 95.46%, 100%, 100%, 10.52% respectively. Conclusion In conclusion, Latex agglutination test is a rapid and reliable test for the identification of Staphylococcus aureus.
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Affiliation(s)
- P Shah
- Department of Microbiology B.P. Koirala Institute of Health Sciences (BPKIHS), Dharan, Sunsari, Nepal
| | - R Sah
- Department of Microbiology B.P. Koirala Institute of Health Sciences (BPKIHS), Dharan, Sunsari, Nepal
| | - A Sharma
- Department of Microbiology B.P. Koirala Institute of Health Sciences (BPKIHS), Dharan, Sunsari, Nepal
| | - B Khanal
- Department of Microbiology B.P. Koirala Institute of Health Sciences (BPKIHS), Dharan, Sunsari, Nepal
| | - N R Bhattarai
- Department of Microbiology B.P. Koirala Institute of Health Sciences (BPKIHS), Dharan, Sunsari, Nepal
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Nordin N, Hussin NS, Hanafiah A, Sulong A. Staphylococcal aureus bacteraemia: Clinical characteristic & evaluation of Prolex Staph Xtra latex agglutination test in the rapid identification of Staphylococcus aureus. Malays J Pathol 2021; 43:435-447. [PMID: 34958065] [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] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
BACKGROUND Staphylococcus aureus is a leading cause of community as well as healthcare-associated bacteraemia. This study aimed to describe clinical characteristics of S. aureus bacteraemia (SAB) and to evaluate the performance of the Prolex Staph Xtra Latex agglutination test in the identification of Staphylococcus aureus. METHODS Cross-sectional study was conducted from Jun 2018 to May 2019. Isolates from first-positive peripheral blood cultures were tested with Prolex Staph Xtra Latex agglutination test, together with routine tube coagulase and DNase test. All isolates were further confirmed with Vitek2 GP. RESULTS Hundred isolates were tested with Prolex Staph Xtra Latex. Twelve isolates were excluded due to incomplete medical records. Eighty-eight isolates were analysed, yielded sensitivities, specificities, positive and negative predictive values of 100%, 91.7%, 98.7%, and 100%, respectively. Of these, 76 were identified as S. aureus and 12 CoNS. Seventy-six patients were included in the SAB analysis. Fifty-nine out of 76 (78.6%) had underlying comorbidities. Thirty-four percent of the episodes were considered as primary SAB. Skin and soft tissue infection were accounted for the highest source of bacteraemia, 24(31.6%). Both MRSA and MSSA bacteraemia were seen mostly among healthcare-associated bacteraemia (HCA) (7/16, 43.8% and 28/60, 46.7%). Liver cirrhosis was significantly associated with MRSA bacteraemia (P=0.048). Metastatic infection & complicated SAB were identified in 13(17.1%) and 30(39.5%) of cases, respectively. All-cause mortality was 22.4%. CONCLUSION S. aureus bacteraemia is a serious infection associated with significant metastatic complications and mortality. Prolex Staph Xtra Latex agglutination test has excellent sensitivity and specificity with 100% and 91.7% respectively.
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Affiliation(s)
- N Nordin
- Universiti Kebangsaan Malaysia Medical Centre, Faculty of Medicine, Departments of Medical Microbiology & Immunology, 56000 Kuala Lumpur, Malaysia
| | - N S Hussin
- Universiti Kebangsaan Malaysia Medical Centre, Faculty of Medicine, Departments of Medical Microbiology & Immunology, 56000 Kuala Lumpur, Malaysia
| | - A Hanafiah
- Universiti Kebangsaan Malaysia Medical Centre, Faculty of Medicine, Departments of Medical Microbiology & Immunology, 56000 Kuala Lumpur, Malaysia
| | - A Sulong
- Hospital Kuala Lumpur, Department of Pathology, Kuala Lumpur, Malaysia
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Narwortey DK, Owusu-Ofori A, Slotved HC, Donkor ES, Ansah PO, Welaga P, Agongo G, Oduro AR. Nasopharyngeal carriage of Streptococcus pneumoniae among healthy children in Kassena-Nankana districts of Northern Ghana. BMC Infect Dis 2021; 21:661. [PMID: 34233627 PMCID: PMC8265090 DOI: 10.1186/s12879-021-06302-5] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [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] [Received: 11/06/2020] [Accepted: 05/17/2021] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Pneumococcal vaccine immunizations may be responsible for alterations in serotype epidemiology within a region. This study investigated the pneumococcal carriage prevalence and the impact of the 13-valent pneumococcal conjugate vaccine (PCV-13) on circulating serotypes among healthy children in Northern Ghana. METHODS This was a cross sectional study conducted in the Kassena-Nankana districts of Northern Ghana from November to December during the dry season of 2018. Nasopharyngeal swabs collected from 193 participants were cultured per standard microbiological protocols and pneumococcal isolates were serotyped using the latex agglutination technique and the capsular Quellung reaction test. We examined for any association between the demographic characteristics of study participants and pneumococcal carriage using chi-square test and logistic regression. RESULTS Of the 193 participants that were enrolled the mean age was 8.6 years and 54.4% were females. The carriage rate among the participants was 32.6% (63/193), and twenty different serotypes were identified. These included both vaccine serotypes (VT), 35% (7/20) and non-vaccine serotypes (NVT), 65% (13/20). The predominant serotypes (34 and 11A), both of which were NVT, accounted for a prevalence of 12.8%. PCV-13 covered only 35% of serotypes identified whiles 40% of serotypes are covered by PPV 23. CONCLUSION Post-vaccination carriage of S. pneumoniae is high and is dominated by non-vaccine serotypes. There is therefore a need for the conduct of invasive pneumococcal disease surveillance (IPD) to find out if the high non-vaccine serotype carriage translates to disease. And in addition, a review of the currently used PCV-13 vaccine in the country would be considered relevant.
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Affiliation(s)
- Deborah K. Narwortey
- Navrongo Health Research Centre, Ghana Health Services, Biomedical Department, P.O. Box 114, Navrongo, Ghana
- Department of Clinical Microbiology, School of Medicine and Dentistry, Kwame Nkrumah University of Science and Technology, Kumasi, Ghana
| | - Alex Owusu-Ofori
- Department of Clinical Microbiology, School of Medicine and Dentistry, Kwame Nkrumah University of Science and Technology, Kumasi, Ghana
| | - Hans-Christian Slotved
- Department of Bacteria, Parasites and Fungi, Statens Serum Institut, Copenhagen, Denmark
| | - Eric S. Donkor
- Department of Medical Microbiology, University of Ghana Medical School, Accra, Ghana
| | - Patrick O. Ansah
- Navrongo Health Research Centre, Ghana Health Services, Biomedical Department, P.O. Box 114, Navrongo, Ghana
| | - Paul Welaga
- Navrongo Health Research Centre, Ghana Health Services, Biomedical Department, P.O. Box 114, Navrongo, Ghana
| | - Godfred Agongo
- Navrongo Health Research Centre, Ghana Health Services, Biomedical Department, P.O. Box 114, Navrongo, Ghana
| | - Abraham R. Oduro
- Navrongo Health Research Centre, Ghana Health Services, Biomedical Department, P.O. Box 114, Navrongo, Ghana
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Imataka G, Otsubo Y, Fujita Y, Yoshihara S. An infantile late-onset case Group of B Streptococcus meningitis diagnosed with a rapid latex kit. Med J Malaysia 2021; 76:588-590. [PMID: 34305126] [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] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Globally, vaccination has reduced the prevalence of meningitis caused by Streptococcus pneumoniae Neisseria meningitidis, and Haemophilus influenzae. However, neonatal Group B Streptococcus (GBS) meningitis continues to remain a problematic infection of the central nervous system. Here, we report a case of bacterial meningitis in a 34-day old male baby who presented with fever. A cerebrospinal fluid (CSF) test on the day of admission showed an increase in cell count with decreased glucose level. A rapid latex test of the CSF using a commercial kit diagnosed the causative pathogen as GBS. We administered the antibiotics ampicillin, cefotaxime, gentamicin and panipenem/betamipron to the patient for over 14 days. Partial seizures were frequently observed during the course and were well-controlled with midazolam and phenobarbital. Brain magnetic resonance imaging on day 17 showed subdural hygroma in the frontal region, and 99mTc ethyl-cysteinate dimer-single photon emission computed tomography confirmed a decreased cerebral blood flow predominantly in the left frontal region. After three years of follow-up, the condition of the patient improved without any neurological sequelae. Our report highlights that rapid identification of the causative organism is essential in infantile late-onset meningitis. In addition, we consider that the latex kit-based rapid testing of CSF is beneficial for identifying the causative agent of bacterial meningitis.
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Affiliation(s)
- G Imataka
- Dokkyo Medical University, Department of Pediatrics, Tochigi, Japan.
| | - Y Otsubo
- Dokkyo Medical University, Department of Pediatrics, Tochigi, Japan
| | - Y Fujita
- Dokkyo Medical University, Department of Pediatrics, Tochigi, Japan
| | - S Yoshihara
- Dokkyo Medical University, Department of Pediatrics, Tochigi, Japan
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10
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Muangsombut V, Withatanung P, Chantratita N, Chareonsudjai S, Lim J, Galyov EE, Ottiwet O, Sengyee S, Janesomboon S, Loessner MJ, Dunne M, Korbsrisate S. Rapid Clinical Screening of Burkholderia pseudomallei Colonies by a Bacteriophage Tail Fiber-Based Latex Agglutination Assay. Appl Environ Microbiol 2021; 87:e0301920. [PMID: 33811022 PMCID: PMC8174754 DOI: 10.1128/aem.03019-20] [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] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2020] [Accepted: 03/15/2021] [Indexed: 01/21/2023] Open
Abstract
Melioidosis is a life-threatening disease in humans caused by the Gram-negative bacterium Burkholderia pseudomallei. As severe septicemic melioidosis can lead to death within 24 to 48 h, a rapid diagnosis of melioidosis is critical for ensuring that an optimal antibiotic course is prescribed to patients. Here, we report the development and evaluation of a bacteriophage tail fiber-based latex agglutination assay for rapid detection of B. pseudomallei infection. Burkholderia phage E094 was isolated from rice paddy fields in northeast Thailand, and the whole genome was sequenced to identify its tail fiber (94TF). The 94TF complex was structurally characterized, which involved identification of a tail assembly protein that forms an essential component of the mature fiber. Recombinant 94TF was conjugated to latex beads and developed into an agglutination-based assay (94TF-LAA). 94TF-LAA was initially tested against a large library of Burkholderia and other bacterial strains before a field evaluation was performed during routine clinical testing. The sensitivity and specificity of the 94TF-LAA were assessed alongside standard biochemical analyses on 300 patient specimens collected from an area of melioidosis endemicity over 11 months. The 94TF-LAA took less than 5 min to produce positive agglutination, demonstrating 98% (95% confidence interval [CI] of 94.2% to 99.59%) sensitivity and 83% (95% CI of 75.64% to 88.35%) specificity compared to biochemical-based detection. Overall, we show how a Burkholderia-specific phage tail fiber can be exploited for rapid detection of B. pseudomallei. The 94TF-LAA has the potential for further development as a supplementary diagnostic to assist in clinical identification of this life-threatening pathogen. IMPORTANCE Rapid diagnosis of melioidosis is essential for ensuring that optimal antibiotic courses are prescribed to patients and thus warrants the development of cost-effective and easy-to-use tests for implementation in underresourced areas such as northeastern Thailand and other tropical regions. Phage tail fibers are an interesting alternative to antibodies for use in various diagnostic assays for different pathogenic bacteria. As exposed appendages of phages, tail fibers are physically robust and easy to manufacture, with many tail fibers (such as 94TF investigated here) capable of targeting a given bacterial species with remarkable specificity. Here, we demonstrate the effectiveness of a latex agglutination assay using a Burkholderia-specific tail fiber 94TF against biochemical-based detection methods that are the standard diagnostic in many areas where melioidosis is endemic.
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Affiliation(s)
- Veerachat Muangsombut
- Department of Immunology, Faculty of Medicine Siriraj Hospital, Mahidol University, Bangkok, Thailand
| | - Patoo Withatanung
- Department of Immunology, Faculty of Medicine Siriraj Hospital, Mahidol University, Bangkok, Thailand
| | - Narisara Chantratita
- Department of Microbiology and Immunology, Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand
| | - Sorujsiri Chareonsudjai
- Department of Microbiology and Melioidosis Research Center, Faculty of Medicine, Khon Kaen University, Khon Kaen, Thailand
| | - Jiali Lim
- DSO National Laboratories, Singapore
| | - Edouard E. Galyov
- Department of Genetics and Genome Biology, College of Life Sciences, University of Leicester, Leicester, United Kingdom
| | - Orawan Ottiwet
- Department of Medical Technology and Clinical Pathology, Mukdahan Hospital, Mukdahan, Thailand
| | - Sineenart Sengyee
- Department of Microbiology and Immunology, Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand
| | - Sujintana Janesomboon
- Department of Immunology, Faculty of Medicine Siriraj Hospital, Mahidol University, Bangkok, Thailand
| | | | - Matthew Dunne
- Institute of Food Nutrition and Health, ETH Zurich, Zurich, Switzerland
| | - Sunee Korbsrisate
- Department of Immunology, Faculty of Medicine Siriraj Hospital, Mahidol University, Bangkok, Thailand
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11
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Diallo K, Feteh VF, Ibe L, Antonio M, Caugant DA, du Plessis M, Deghmane AE, Feavers IM, Fernandez K, Fox LM, Rodrigues CMC, Ronveaux O, Taha MK, Wang X, Brueggemann AB, Maiden MCJ, Harrison OB. Molecular diagnostic assays for the detection of common bacterial meningitis pathogens: A narrative review. EBioMedicine 2021; 65:103274. [PMID: 33721818 PMCID: PMC7957090 DOI: 10.1016/j.ebiom.2021.103274] [Citation(s) in RCA: 10] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2020] [Revised: 02/19/2021] [Accepted: 02/22/2021] [Indexed: 11/29/2022] Open
Abstract
Bacterial meningitis is a major global cause of morbidity and mortality. Rapid identification of the aetiological agent of meningitis is essential for clinical and public health management and disease prevention given the wide range of pathogens that cause the clinical syndrome and the availability of vaccines that protect against some, but not all, of these. Since microbiological culture is complex, slow, and often impacted by prior antimicrobial treatment of the patient, molecular diagnostic assays have been developed for bacterial detection. Distinguishing between meningitis caused by Neisseria meningitidis (meningococcus), Streptococcus pneumoniae (pneumococcus), Haemophilus influenzae, and Streptococcus agalactiae and identifying their polysaccharide capsules is especially important. Here, we review methods used in the identification of these bacteria, providing an up-to-date account of available assays, allowing clinicians and diagnostic laboratories to make informed decisions about which assays to use.
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Affiliation(s)
- Kanny Diallo
- Department of Zoology, University of Oxford, South Parks Rd, Oxford OX1 3SY, United Kingdom; Centre Suisse de Recherches Scientifiques en Côte d'Ivoire, Abidjan, Cote d'Ivoire
| | - Vitalis F Feteh
- Department of Zoology, University of Oxford, South Parks Rd, Oxford OX1 3SY, United Kingdom; Nuffield Department of Population Health, Big Data Institute, University of Oxford, Oxford OX3 7LF, United Kingdom
| | - Lilian Ibe
- Department of Zoology, University of Oxford, South Parks Rd, Oxford OX1 3SY, United Kingdom; Nuffield Department of Population Health, Big Data Institute, University of Oxford, Oxford OX3 7LF, United Kingdom
| | - Martin Antonio
- WHO Collaborating Centre for New Vaccines Surveillance, Medical Research Council Unit The Gambia at London School of Hygiene & Tropical Medicine, Atlantic Boulevard, Fajara, PO Box 273, Banjul, Gambia; Department of Infection Biology, Faculty of Infectious and Tropical Diseases, London School of Hygiene & Tropical Medicine, London, United Kingdom
| | - Dominique A Caugant
- WHO Collaborating Center for Reference and Research on Meningococci, Norwegian Institute of Public Health, Oslo N-0213, Norway
| | - Mignon du Plessis
- A division of the National Health Laboratory Service (NHLS), National Institute for Communicable Diseases (NICD), Johannesburg, South Africa
| | | | - Ian M Feavers
- Department of Zoology, University of Oxford, South Parks Rd, Oxford OX1 3SY, United Kingdom
| | | | - LeAnne M Fox
- National Center for Immunization and Respiratory Diseases, Centers for Disease Control and Prevention, Division of Bacterial Diseases, Meningitis and Vaccine Preventable Diseases Branch, United States
| | - Charlene M C Rodrigues
- Department of Zoology, University of Oxford, South Parks Rd, Oxford OX1 3SY, United Kingdom; Department of Paediatric Infectious Diseases, St George's University Hospitals NHS Foundation Trust, London, United Kingdom
| | | | | | - Xin Wang
- National Center for Immunization and Respiratory Diseases, Centers for Disease Control and Prevention, Division of Bacterial Diseases, Meningitis and Vaccine Preventable Diseases Branch, United States
| | - Angela B Brueggemann
- Nuffield Department of Population Health, Big Data Institute, University of Oxford, Oxford OX3 7LF, United Kingdom
| | - Martin C J Maiden
- Department of Zoology, University of Oxford, South Parks Rd, Oxford OX1 3SY, United Kingdom
| | - Odile B Harrison
- Department of Zoology, University of Oxford, South Parks Rd, Oxford OX1 3SY, United Kingdom.
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12
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Swarthout TD, Gori A, Bar-Zeev N, Kamng'ona AW, Mwalukomo TS, Bonomali F, Nyirenda R, Brown C, Msefula J, Everett D, Mwansambo C, Gould K, Hinds J, Heyderman RS, French N. Evaluation of Pneumococcal Serotyping of Nasopharyngeal-Carriage Isolates by Latex Agglutination, Whole-Genome Sequencing (PneumoCaT), and DNA Microarray in a High-Pneumococcal-Carriage-Prevalence Population in Malawi. J Clin Microbiol 2020; 59:e02103-20. [PMID: 33087431 PMCID: PMC7771446 DOI: 10.1128/jcm.02103-20] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2020] [Accepted: 10/09/2020] [Indexed: 11/24/2022] Open
Abstract
Accurate assessment of the serotype distribution associated with pneumococcal colonization and disease is essential for evaluating and formulating pneumococcal vaccines and for informing vaccine policy. For this reason, we evaluated the concordance between pneumococcal serotyping results by latex agglutination, whole-genome sequencing (WGS) with PneumoCaT, and DNA microarray for samples from community carriage surveillance in Blantyre, Malawi. Nasopharyngeal swabs were collected according to WHO recommendations between 2015 and 2017 by using stratified random sampling among study populations. Participants included healthy children 3 to 6 years old (vaccinated with the 13-valent pneumococcal conjugate vaccine [PCV13] as part of the Expanded Program on Immunization [EPI]), healthy children 5 to 10 years old (age-ineligible for PCV13), and HIV-infected adults (18 to 40 years old) on antiretroviral therapy (ART). For phenotypic serotyping, we used a 13-valent latex kit (Statens Serum Institut [SSI], Denmark). For genomic serotyping, we applied the PneumoCaT pipeline to whole-genome sequence libraries. For molecular serotyping by microarray, we used the BUGS Bioscience Senti-SP microarray. A total of 1,347 samples were analyzed. Concordance was 90.7% (95% confidence interval [CI], 89.0 to 92.2%) between latex agglutination and PneumoCaT, 95.2% (95% CI, 93.9 to 96.3%) between latex agglutination and the microarray, and 96.6% (95% CI, 95.5 to 97.5%) between the microarray and PneumoCaT. By detecting additional vaccine serotype (VT) pneumococci carried at low relative abundances (median, 8%), the microarray increased VT detection by 31.5% over that by latex serotyping. To conclude, all three serotyping methods were highly concordant in identifying dominant serotypes. Latex serotyping is accurate in identifying vaccine serotypes and requires the least expertise and resources for field implementation and analysis. However, WGS, which adds population structure, and microarray, which adds multiple-serotype carriage, should be considered at regional reference laboratories for investigating the importance of vaccine serotypes at low relative abundances in transmission and disease.
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Affiliation(s)
- Todd D Swarthout
- Malawi-Liverpool-Wellcome Trust Clinical Research Programme, Blantyre, Malawi
- NIHR Global Health Research Unit on Mucosal Pathogens, Division of Infection and Immunity, University College London, London, United Kingdom
| | - Andrea Gori
- NIHR Global Health Research Unit on Mucosal Pathogens, Division of Infection and Immunity, University College London, London, United Kingdom
| | - Naor Bar-Zeev
- Malawi-Liverpool-Wellcome Trust Clinical Research Programme, Blantyre, Malawi
- International Vaccine Access Center, Department of International Health, Johns Hopkins University, Baltimore, Maryland, USA
| | - Arox W Kamng'ona
- Department of Biomedical Sciences, College of Medicine, University of Malawi, Blantyre, Malawi
| | - Thandie S Mwalukomo
- Department of Medicine, College of Medicine, University of Malawi, Blantyre, Malawi
| | - Farouck Bonomali
- Malawi-Liverpool-Wellcome Trust Clinical Research Programme, Blantyre, Malawi
| | - Roseline Nyirenda
- Malawi-Liverpool-Wellcome Trust Clinical Research Programme, Blantyre, Malawi
| | - Comfort Brown
- Malawi-Liverpool-Wellcome Trust Clinical Research Programme, Blantyre, Malawi
| | - Jacquline Msefula
- Malawi-Liverpool-Wellcome Trust Clinical Research Programme, Blantyre, Malawi
| | - Dean Everett
- The Queens Medical Research Institute, University of Edinburgh, Edinburgh, Scotland
| | | | - Katherine Gould
- Institute for Infection and Immunity, St. George's, University of London, London, United Kingdom
- BUGS Bioscience, London Bioscience Innovation Centre, London, United Kingdom
| | - Jason Hinds
- Institute for Infection and Immunity, St. George's, University of London, London, United Kingdom
- BUGS Bioscience, London Bioscience Innovation Centre, London, United Kingdom
| | - Robert S Heyderman
- Malawi-Liverpool-Wellcome Trust Clinical Research Programme, Blantyre, Malawi
- NIHR Global Health Research Unit on Mucosal Pathogens, Division of Infection and Immunity, University College London, London, United Kingdom
| | - Neil French
- Malawi-Liverpool-Wellcome Trust Clinical Research Programme, Blantyre, Malawi
- Centre for Global Vaccine Research, Institute of Infection and Global Health, University of Liverpool, Liverpool, United Kingdom
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13
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Samotrueva MA, Yasenyavskaya AL, Murtalieva VK, Bashkina OA, Myasoedov NF, Andreeva LA, Karaulov AV. Experimental Substantiation of Application of Semax as a Modulator of Immune Reaction on the Model of "Social" Stress. Bull Exp Biol Med 2019; 166:754-758. [PMID: 31028579 DOI: 10.1007/s10517-019-04434-y] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [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] [Received: 07/04/2018] [Indexed: 11/25/2022]
Abstract
We studied immunocorrecting effects of Semax (Met-Glu-His-Phe-Pro-Gly-Pro) on the model of "social" stress caused by sensory contact and intermale confrontation. Functional activity of the immune system of laboratory animals was evaluated in standard immunopharmacological tests: delayed-type hypersensitivity reaction, direct agglutination test, latex test for studying phagocytic activity of peripheral blood neutrophils, changes in differential leukocyte count, and weight of immunocompetent organs. It was found that changes in the immune response caused by "social" stress are multidirectional, which confirms the theory of stress-induced "immune imbalance". Semax acted as effective immune corrector restoring cellular and humoral immunogenesis reactions and phagocytic activity of neutrophils. This attested to the presence of immunomodulating properties in Semax and necessitates further studies in this field.
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Affiliation(s)
- M A Samotrueva
- Astrakhan State Medical University, Ministry of Health of the Russian Federation, Astrakhan, Russia
| | - A L Yasenyavskaya
- Astrakhan State Medical University, Ministry of Health of the Russian Federation, Astrakhan, Russia.
| | - V Kh Murtalieva
- Astrakhan State Medical University, Ministry of Health of the Russian Federation, Astrakhan, Russia
| | - O A Bashkina
- Astrakhan State Medical University, Ministry of Health of the Russian Federation, Astrakhan, Russia
| | - N F Myasoedov
- Institute of Molecular Genetics, Russian Academy of Sciences, Ministry of Health of the Russian Federation, Moscow, Russia
| | - L A Andreeva
- Institute of Molecular Genetics, Russian Academy of Sciences, Ministry of Health of the Russian Federation, Moscow, Russia
| | - A V Karaulov
- I. M. Sechenov First Moscow State Medical University (Sechenov University), Ministry of Health of the Russian Federation, Moscow, Russia
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14
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Jackson N, Wu TZ, Adams-Sapper S, Satoorian T, Geisberg M, Murthy N, Lee L, Riley LW. A multiplexed, indirect enzyme-linked immunoassay for the detection and differentiation of E. coli from other Enterobacteriaceae and P. aeruginosa from other glucose non-fermenters. J Microbiol Methods 2019; 158:52-58. [PMID: 30708086 DOI: 10.1016/j.mimet.2019.01.014] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [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: 12/07/2018] [Revised: 01/19/2019] [Accepted: 01/28/2019] [Indexed: 10/27/2022]
Abstract
Gram-negative bacteria (GNB) are important causes of community (CA) and hospital (HA)- associated infections. Here we describe the development of an indirect ELISA (I-ELISA), which can be used to detect and differentiate the Enterobacteriaceae Escherichia coli, and glucose non-fermenter Pseudomonas aeruginosa from other GNB species. The I-ELISA utilizes six antibodies for bacterial speciation, which were grouped according to their bacterial targets; Enterobacteriaceae (SL-EntA and CH1810 mAb), Escherichia coli (SL-EcA and 6103-46 mAb), Pseudomonas aeruginosa (SL-PaA and SL-PaB). The six, anti-GNB antibodies were first screened against a panel of well-characterized clinical GNB isolates to optimize assay conditions and to determine individual antibody sensitivity and specificity. When tested against a diverse, blinded panel of 94 GNB clinical isolates, the I-ELISA exhibited the following sensitivity/specificity for each target: Enterobacteriaceae (94.4%/95%), E. coli (82.6%/88.7%), P. aeruginosa (83.3%/96%). An I-ELISA to detect and differentiate the most common GNB pathogens offers advantage in terms of simplicity over diagnostic tests currently used in most clinical settings.
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Affiliation(s)
- N Jackson
- School of Public Health, Division of Infectious Disease and Vaccinology, University of California, Berkeley, CA 94720, USA
| | - T Z Wu
- School of Public Health, Division of Infectious Disease and Vaccinology, University of California, Berkeley, CA 94720, USA
| | - S Adams-Sapper
- School of Public Health, Division of Infectious Disease and Vaccinology, University of California, Berkeley, CA 94720, USA
| | - T Satoorian
- Silver Lake Research Corporation, Azusa, CA 91702, USA
| | - M Geisberg
- Silver Lake Research Corporation, Azusa, CA 91702, USA
| | - N Murthy
- School of Public Health, Division of Infectious Disease and Vaccinology, University of California, Berkeley, CA 94720, USA
| | - L Lee
- School of Public Health, Division of Infectious Disease and Vaccinology, University of California, Berkeley, CA 94720, USA
| | - L W Riley
- School of Public Health, Division of Infectious Disease and Vaccinology, University of California, Berkeley, CA 94720, USA.
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15
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Takazono T, Saijo T, Ashizawa N, Oshima K, Nishimura K, Tashiro M, Yamamoto K, Imamura Y, Miyazaki T, Yanagihara K, Mukae H, Izumikawa K, Sheppard DC. Clinical features and cause analysis of false positive results of Aspergillus galactomannan assay in pulmonary cryptococcosis patients. Eur J Clin Microbiol Infect Dis 2019; 38:735-741. [PMID: 30684164 DOI: 10.1007/s10096-019-03469-3] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [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] [Received: 11/27/2018] [Accepted: 01/02/2019] [Indexed: 11/30/2022]
Abstract
There have been conflicting reports of false positive galactomannan assay results in patients with systemic cryptococcosis. We sought to determine the frequency of GM positivity in patients with pulmonary cryptococcosis and confirm the source of this cross-reactivity in vitro. We conducted a retrospective study to elucidate the rate of galactomannan (GM) false positivity and cause in a cohort of 29 patients with pulmonary cryptococcal disease. The production of GM cross-reacting substances by clinical isolates and laboratory isolates of C. neoformans was tested in vitro. The mean serum GM index (Platelia Aspergillus) in patients with pulmonary cryptococcosis was 1.06, with 16 (55.2%) of patients having values above the positive cutoff value of 0.5. GM index values significantly decreased after treatment of cryptococcosis. There was no significant correlation between galactomannan and cryptococcal glucuronoxylomannan antigen (Eiken Latex test) results. Culture supernatants from clinical isolates and wild-type C. neoformans did not react in the GM assay; however, growth in the presence of 6% sodium chloride induced the production of cross-reacting GM antigens in culture supernatants from clinical isolates, wild type and a glucuronoxylomannan-deficient mutant of C. neoformans, but not in culture supernatants from a galactoxylomannan-deficient strain. Our results support the cross-reactivity of cryptococcal galactoxylomannan with the serum GM assay in vitro and in patients with pulmonary cryptococcal infection.
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Affiliation(s)
- Takahiro Takazono
- Department of Infectious Diseases, Graduate School of Biomedical Sciences, Nagasaki University, Nagasaki, Japan.
- Second Department of Internal Medicine, Nagasaki University Hospital, Nagasaki, Japan.
- Departments of Medicine, Microbiology and Immunology, McGill University, Montréal, Québec, Canada.
- Infectious Diseases and Immunity in Global Health Program, Research Institute of the McGill University Health Centre, Montréal, Québec, Canada.
| | - Tomomi Saijo
- Second Department of Internal Medicine, Nagasaki University Hospital, Nagasaki, Japan
| | - Nobuyuki Ashizawa
- Second Department of Internal Medicine, Nagasaki University Hospital, Nagasaki, Japan
| | - Kazuhiro Oshima
- Second Department of Internal Medicine, Nagasaki University Hospital, Nagasaki, Japan
| | - Keitaro Nishimura
- Department of Infectious Diseases, Graduate School of Biomedical Sciences, Nagasaki University, Nagasaki, Japan
| | - Masato Tashiro
- Department of Infectious Diseases, Graduate School of Biomedical Sciences, Nagasaki University, Nagasaki, Japan
| | - Kazuko Yamamoto
- Second Department of Internal Medicine, Nagasaki University Hospital, Nagasaki, Japan
| | - Yoshifumi Imamura
- Second Department of Internal Medicine, Nagasaki University Hospital, Nagasaki, Japan
| | - Taiga Miyazaki
- Department of Infectious Diseases, Graduate School of Biomedical Sciences, Nagasaki University, Nagasaki, Japan
- Second Department of Internal Medicine, Nagasaki University Hospital, Nagasaki, Japan
| | - Katsunori Yanagihara
- Department of Laboratory Medicine, Nagasaki University Hospital, Nagasaki, Japan
| | - Hiroshi Mukae
- Second Department of Internal Medicine, Nagasaki University Hospital, Nagasaki, Japan
| | - Koichi Izumikawa
- Department of Infectious Diseases, Graduate School of Biomedical Sciences, Nagasaki University, Nagasaki, Japan
| | - Donald C Sheppard
- Departments of Medicine, Microbiology and Immunology, McGill University, Montréal, Québec, Canada
- Infectious Diseases and Immunity in Global Health Program, Research Institute of the McGill University Health Centre, Montréal, Québec, Canada
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16
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Abstract
Bladder cancer shows extreme variability in its behavior. Even the superficial forms, when surgically treated, are characterized by a high recurrence rate, and therefore regular and intensive post-treatment monitoring is an important aspect of the management of this tumor. The standard follow-up of patients with a bladder cancer history is based on cystoscopic examination of the internal bladder, which is an invasive procedure causing discomfort to the patient. In this context, the availability of a non-invasive laboratory test which measures circulating markers associated with bladder cancer could facilitate the monitoring of patients and could be of help in understanding the metastatic potential of bladder tumors, especially the superficial forms.
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Affiliation(s)
- C Botti
- Nuclear Medicine Department, Istituto Nazionale per lo Studio e la Cura dei Tumori, Milano
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17
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Martinuzzo ME, Ujhelly C, Barrera LH, Adamo MAD, Lopez MS, Otaso JC, Oyhamburu J. Validation of an Automated Immunoturbidimetric Assay for Fibrinogen/Fibrin Degradation Products Measurement and its Correlation to a Semi-Quantitative Latex Agglutination Test. Clin Lab 2017; 62:2085-2089. [PMID: 28164666 DOI: 10.7754/clin.lab.2016.160223] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
BACKGROUND Laboratory determination of fibrinogen/fibrin degradation product (FDP) levels is important as a hyperfibrinolytic state marker. The aim of the study was to verify the analytical performance of an automated immunoturbidimetric assay (AIMT) for FDP and its comparison to a latex agglutination semiquantitative (SLAT) test. METHODS Total precision and accuracy was calculated following the EP 15-A2 protocol at two levels of controls. The protocol EP6 was performed for linearity. For semi-quantitative methods comparison, 71 consecutive samples were used. Concordance between methods results in term of positive and negative, and in categories, from <10 to > 160 µg/mL, was calculated through Cohen kappa coefficient (). RESULTS Total CV%: low control (10.8 µg/mL) 8.0 and 3.7 vs. 4.8 and high control (31.3 µg/mL) 2.7 and 3.8 vs. 3.6, for coagulometer ACL TOP 500 and 300 vs. manufacturer claimed, respectively. Linearity between 0 and 125 µg/mL showed polynomial fit analysis applicable. When correlating AIMT to SLAT, a good concordance was observed: of results expressed as positive-negative = 79.5% with 90.1% of agreement (p < 0.001), of results expressed as categories = 72.2% (p < 0.001) with 80.3% concordance. CONCLUSIONS AIMT presented good analytical performance, and the concordance with SLAT by comparison of patients' samples results was also good. The implementation of IMMT in the clinical laboratory is suitable and reliable.
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18
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Fernández-Roldán C, Rodríguez-Grangér J, Javier Martínez R, López-Ruz MA, Navarro-Marí JM, Gutiérrez-Fernández J. [Performance of the KAtex test in screening and diagnosis for visceral leishmaniasis in a reference hospital]. REVISTA ESPANOLA DE QUIMIOTERAPIA : PUBLICACION OFICIAL DE LA SOCIEDAD ESPANOLA DE QUIMIOTERAPIA 2017; 30:464-467. [PMID: 29160649] [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] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
OBJECTIVE Performing of diagnostic test simple using samples not invasive in the diagnosis of visceral leishmaniasis (VL) may be very beneficial, being necessary comparing to traditional methods. The objective of this study was to know the reliability of test KAtex in the urine of patients with suspicion of VL. METHODS Retrospectively were reviewed the medical histories of patients with suspected of VL to which are performed the test between 2009 and 2015. For its analysis were selected the patients to which is them had made study of the parasite in bone marrow. RESULTS A total of 110 patients were studied, and bone marrow biopsy for research of Leishmania was performed in 44 (40%). In these patients the sensitivity of the test was 50%, the specificity of 96.7%, positive predictive value of 87.5% and negative predictive value of 80.5%. CONCLUSIONS KAtex antigenuria sensitivity is too low recommending it as a unique method in the detection of VL in our medium.
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Affiliation(s)
| | - J Rodríguez-Grangér
- José Gutiérrez-Fernández. Laboratorio de Microbiología. Hospital Virgen de las Nieves. Avenida de las Fuerzas Armadas, 2. E-18012 Granada, Spain.
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19
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Bystryak S, Ossina N. A rapid ultrasound particle agglutination method for HIV antibody detection: Comparison with conventional rapid HIV tests. J Virol Methods 2017; 249:38-47. [PMID: 28843787 DOI: 10.1016/j.jviromet.2017.08.015] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [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: 04/14/2017] [Revised: 08/15/2017] [Accepted: 08/18/2017] [Indexed: 01/05/2023]
Abstract
We present the results of the feasibility and preliminary studies on analytical performance of a rapid test for detection of human immunodeficiency virus (HIV) antibodies in human serum or plasma that is an important advance in detecting HIV infection. Current methods for rapid testing of antibodies against HIV are qualitative and exhibit poor sensitivity (limit of detection). In this paper, we describe an ultrasound particle agglutination (UPA) method that leads to a significant increase of the sensitivity of conventional latex agglutination tests for HIV antibody detection in human serum or plasma. The UPA method is based on the use of: 1) a dual mode ultrasound, wherein a first single-frequency mode is used to accelerate the latex agglutination process, and then a second swept-frequency mode of sonication is used to disintegrate non-specifically bound aggregates; and 2) a numerical assessment of results of the agglutination process. The numerical assessment is carried out by optical detection and analysis of moving patterns in the resonator cell during the swept-frequency mode. The single-step UPA method is rapid and more sensitive than the three commercial rapid HIV test kits analyzed in the study: analytical sensitivity of the new UPA method was found to be 510-, 115-, and 80-fold higher than that for Capillus™, Multispot™ and Uni-Gold™ Recombigen HIV antibody rapid test kits, respectively. The newly developed UPA method opens up additional possibilities for detection of a number of clinically significant markers in point-of-care settings.
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Affiliation(s)
- Simon Bystryak
- Allied Innovative Systems, 13 Watchung Ave., ste 102, Chatham, NJ 07928, USA.
| | - Natalya Ossina
- Allied Innovative Systems, 13 Watchung Ave., ste 102, Chatham, NJ 07928, USA
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Suttisunhakul V, Pumpuang A, Ekchariyawat P, Wuthiekanun V, Elrod MG, Turner P, Currie BJ, Phetsouvanh R, Dance DAB, Limmathurotsakul D, Peacock SJ, Chantratita N. Matrix-assisted laser desorption/ionization time-of-flight mass spectrometry for the identification of Burkholderia pseudomallei from Asia and Australia and differentiation between Burkholderia species. PLoS One 2017; 12:e0175294. [PMID: 28384252 PMCID: PMC5383291 DOI: 10.1371/journal.pone.0175294] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2016] [Accepted: 03/23/2017] [Indexed: 11/21/2022] Open
Abstract
Matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF MS) is increasingly used for rapid bacterial identification. Studies of Burkholderia pseudomallei identification have involved small isolate numbers drawn from a restricted geographic region. There is a need to expand the reference database and evaluate B. pseudomallei from a wider geographic distribution that more fully captures the extensive genetic diversity of this species. Here, we describe the evaluation of over 650 isolates. Main spectral profiles (MSP) for 26 isolates of B. pseudomallei (N = 5) and other Burkholderia species (N = 21) were added to the Biotyper database. MALDI-TOF MS was then performed on 581 B. pseudomallei, 19 B. mallei, 6 B. thailandensis and 23 isolates representing a range of other bacterial species. B. pseudomallei originated from northeast and east Thailand (N = 524), Laos (N = 12), Cambodia (N = 14), Hong Kong (N = 4) and Australia (N = 27). All 581 B. pseudomallei were correctly identified, with 100% sensitivity and specificity. Accurate identification required a minimum inoculum of 5 x 107 CFU/ml, and identification could be performed on spiked blood cultures after 24 hours of incubation. Comparison between a dendrogram constructed from MALDI-TOF MS main spectrum profiles and a phylogenetic tree based on recA gene sequencing demonstrated that MALDI-TOF MS distinguished between B. pseudomallei and B. mallei, while the recA tree did not. MALDI-TOF MS is an accurate method for the identification of B. pseudomallei, and discriminates between this and other related Burkholderia species.
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Affiliation(s)
- Vichaya Suttisunhakul
- Department of Microbiology and Immunology, Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand
| | - Apinya Pumpuang
- Department of Clinical Pathology, Faculty of Medicine, Navamindradhiraj University, Bangkok, Thailand
| | - Peeraya Ekchariyawat
- Department of Microbiology and Immunology, Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand
| | - Vanaporn Wuthiekanun
- Mahidol-Oxford Tropical Medicine Research Unit, Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand
| | - Mindy G. Elrod
- Bacterial Special Pathogens Branch, Division of High-Consequence Pathogens and Pathology, National Center for Zoonotic and Emerging Infectious Diseases, Centers for Disease Control and Prevention (CDC), Atlanta, Georgia, United States of America
| | - Paul Turner
- Cambodia-Oxford Medical Research Unit, Angkor Hospital for Children, Siem Reap, Cambodia; Centre for Tropical Medicine and Global Health, Nuffield Department of Medicine, University of Oxford, Oxford, United Kingdom
| | - Bart J. Currie
- Department of Infectious Diseases, Royal Darwin Hospital, Darwin, Northern Territory, Australia; Global and Tropical Health Division, Menzies School of Health Research, Darwin, Northern Territory, Australia
| | - Rattanaphone Phetsouvanh
- Lao-Oxford-Mahosot Hospital-Wellcome Trust Research Unit, Microbiology Laboratory, Mahosot Hospital, Vientiane, Lao People's Democratic Republic; Centre for Tropical Medicine and Global Health, University of Oxford, Oxford, United Kingdom
| | - David A. B. Dance
- Lao-Oxford-Mahosot Hospital-Wellcome Trust Research Unit, Microbiology Laboratory, Mahosot Hospital, Vientiane, Lao People's Democratic Republic; Centre for Tropical Medicine and Global Health, University of Oxford, Oxford, United Kingdom
- London School of Hygiene and Tropical Medicine, London, United Kingdom
| | - Direk Limmathurotsakul
- Mahidol-Oxford Tropical Medicine Research Unit, Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand
- Department of Tropical Hygiene, Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand
| | - Sharon J. Peacock
- London School of Hygiene and Tropical Medicine, London, United Kingdom
| | - Narisara Chantratita
- Department of Microbiology and Immunology, Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand
- Mahidol-Oxford Tropical Medicine Research Unit, Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand
- * E-mail:
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Donkor ES, Annan JA, Badoe EV, Dayie NTKD, Labi AK, Slotved HC. Pneumococcal carriage among HIV infected children in Accra, Ghana. BMC Infect Dis 2017; 17:133. [PMID: 28178935 PMCID: PMC5299768 DOI: 10.1186/s12879-017-2224-0] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2016] [Accepted: 01/27/2017] [Indexed: 01/13/2023] Open
Abstract
BACKGROUND Pneumococcal carriage is the precursor for development of pneumococcal disease, and is also responsible for transmission of the organism from person-to-person. In Africa, little is known about the pneumococcus in relation to people with HIV infection. The aim of the study was to investigate the epidemiology of pneumococcal carriage among HIV infected children visiting a tertiary hospital in Ghana, including the carriage prevalence, risk factors and serotype distribution. METHOD This was a cross sectional study carried out from February to May, 2015 at the HIV Paediatric Clinic of the Korle-Bu Teaching Hospital in Accra, Ghana. One hundred and eighteen HIV infected children were recruited and nasopharyngeal (NP) swabs were collected from them. Epidemiological data on demographic, household and clinical features of the study participants were also collected. The NP specimens were cultured for Streptococcus pneumoniae and the isolates were serotyped by latex agglutination. The data of the study was analysed using STATA 11 (Strata Corp, College Station, TX, USA). RESULTS Prevalence of pneumococcal carriage among the HIV infected children was 27.1% (95% CI: 19.1 to 35.1) and the only factor significantly associated with pneumococcal carriage was the presence of respiratory symptoms (OR, 2.63; CI, 1.06-6.53; p = 0.034). The most prevalent pneumococcal serotype among the study participants was serotype 19F (24.4%), followed by 16F (22%). Serotype coverage of the 13-valent Pneumococcal Conjugate Vaccine in this study was 41.5%. Multiple carriage of pneumococcal serotypes among the positive carriage cases was 34.3%. CONCLUSION Pneumococcal carriage occurred in more than a quarter of the study population and was characterized by predominance of non-vaccine serotypes as well as a high prevalence of multiple carriage. Presence of respiratory symptoms appears to be a major determinant of pneumococcal carriage among the study population.
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Affiliation(s)
- Eric S. Donkor
- Department of Medical Microbiology, School of Biomedical and Allied Health Sciences University of Ghana, Accra, Ghana
| | - Jennifer A. Annan
- Department of Medical Microbiology, School of Biomedical and Allied Health Sciences University of Ghana, Accra, Ghana
| | - Ebenezer V. Badoe
- Department of Child Health, School of Medicine and Dentistry, University of Ghana, Accra, Ghana
| | - Nicholas T. K. D. Dayie
- Department of Medical Microbiology, School of Biomedical and Allied Health Sciences University of Ghana, Accra, Ghana
| | | | - Hans-Christian Slotved
- Department of Microbiological Surveillance and Research, Statens Serum Institut, Copenhagen, Denmark
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Abstract
This study compares a recently introduced latex agglutination test for the serogrouping of beta-haemolytic streptococci against four internationally used commercial kits. The new kit is Prolex-Blue (Pro-Lab Diagnostics) and the comparators are Streptex (Murex), PathoDx (DPC), Streptococcus Grouping kit (Oxoid) and Prolex-White (Pro-Lab Diagnostics). A total of 302 consecutive clinical isolates are tested against all five kits, following the individual manufacturer's protocol, for both accuracy and speed. In addition, the data produced permits determination of the strengths or weaknesses of the kits against individual serotypes. Prolex-Blue proved to be both accurate and rapid, with a sensitivity of 99% and a specificity of 100%. Furthermore, average time to agglutination was substantially less than achieved by three of the other four kits evaluated.
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Affiliation(s)
- S Davies
- Microbiology Department, Sheffield Teaching Hospitals, Northern General Hospital, Sheffield S5 7AU, UK.
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Hamano M, Saito M, Eto M, Nishimatsu S, Suda H, Matsuda M, Matsuki M, Yamamoto S, Kaku K. Serum amyloid A, C-reactive protein and remnant-like lipoprotein particle cholesterol in type 2 diabetic patients with coronary heart disease. Ann Clin Biochem 2016; 41:125-9. [PMID: 15025802 DOI: 10.1258/000456304322880005] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Background: Serum amyloid A (SAA) and C-reactive protein (CRP) have been suggested to be involved in the process of coronary heart disease (CHD) and to be potential markers and/or predictors of CHD. Remnant-like lipoprotein particles (RLPs), which are regarded as atherogenic remnant lipoprotein, are reported to be increased in type 2 diabetic patients. We assessed the association of CHD with SAA, CRP and RLP-cholesterol in type 2 diabetic patients. Methods: One hundred and twenty-six diabetic patients without CHD and 41 patients with CHD were recruited from our hospital. Plasma SAA was measured by the latex agglutination nephelometric immunoassay. Plasma high-sensitivity CRP was measured by a latex immunoturbidity method. Plasma RLP-cholesterol was measured by an immunoabsorption enzyme method. Results: The mean standard deviation values of RLP-cholesterol in patients with and without CHD were 0.22 (0.26) mmol/L and 0.15 (0.10) mmol/L, respectively ( P <0.05). Median (interquartile ranges) for SAA in patients with and without CHD were 7.4 (4.2-11.2) mg/L and 3.9 (2.2-5.9) mg/L, respectively ( P <0.001). Median (interquartile ranges) for CRP in patients with and without CHD was 1.14 (0.45-2.08) mg/L and 0.43 (0.19-1.25) mg/L, respectively ( P <0.001). For all patients, the Spearman rank correlation statistics for RLP-cholesterol compared with SAA and with CRP were 0.213 ( P <0.05) and 0.301 ( P <0.01), respectively. Conclusion: These data suggest that SAA, CRP and RLP-cholesterol are increased in type 2 diabetic patients with CHD, and that the inflammatory proteins correlate with remnant lipoprotein.
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Affiliation(s)
- M Hamano
- Clinical Laboratory, Kawasaki Medical School, Kurashiki 701-0192, Japan
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Abstract
This study aims to assess the diagnostic value of a rapid streptococcal antigen test in addition to four clinical features in patients with sore throat, using throat culture and antibody titre as reference tests, and to evaluate the efficacy of the current antibiotics used in the treatment of throat infections caused by group A beta-haemolytic streptococcus (GABHS). Four clinical features (fever [history of] > or = 38 degrees C, lack of cough, tonsillar exudate, and anterior cervical lymphadenopathy) are recorded in 355 patients aged four years to > or =15 years. A rapid antigen diagnostic test (RADT) is performed, as well as a throat culture. Antistreptolysin O (ASO) titre is performed in patients 11 years. GABHS from patients are tested for susceptibility to different antibiotics. Throat cultures were positive for GABHS in 19% patients. Rapid tests were positive in 24%. Compared with throat culture, the rapid test gave a sensitivity of 91%, specificity of 91%, positive predictive value of 73% and a negative predictive value of 98%. For patients with three or four clinical features, however, the sensitivity was considerably higher at 97%. Using the ASO test as a reference, no association was found between RADT and culture results. Zithromax showed the highest prescription rate (25.5%) and produced a high cure rate (91%) in patients with GABHS pharyngitis.
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Affiliation(s)
- A H Abu-Sabaah
- Department of Medical Microbiology, Faculty of Medicine and Medical Sciences, Umm Al-Qura University, Makkah, Saudi Arabia.
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Bates SM, Takach Lapner S, Douketis JD, Kearon C, Julian J, Parpia S, Schulman S, Weitz JI, Linkins LA, Crowther M, Lim W, Spencer FA, Lee AYY, Gross PL, Ginsberg J. Rapid quantitative D-dimer to exclude pulmonary embolism: a prospective cohort management study. J Thromb Haemost 2016; 14:504-9. [PMID: 26707364 DOI: 10.1111/jth.13234] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [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] [Received: 07/03/2015] [Indexed: 12/23/2022]
Abstract
UNLABELLED ESSENTIALS: It is not known if D-dimer testing alone can safely exclude pulmonary embolism (PE). We studied the safety of using a quantitative latex agglutination D-dimer to exclude PE in 808 patients. 52% of patients with suspected PE had a negative D-dimer test and were followed for 3 months. The negative predictive value of D-dimer testing alone was 99.8%, suggesting it may safely exclude PE. SUMMARY BACKGROUND Strategies are needed to exclude pulmonary embolism (PE) efficiently without the need for imaging tests. Although validated rules for clinical probability assessment can be combined with D-dimer testing to safely exclude PE, the rules can be complicated or partially subjective, which limits their use. OBJECTIVES To determine if PE can be safely excluded in patients with a negative D-dimer without incorporating clinical probability assessment. PATIENTS/METHODS We enrolled consecutive outpatients and inpatients with suspected PE from four tertiary care hospitals. All patients underwent D-dimer testing using the MDA D-dimer test, a quantitative latex agglutination assay. PE was excluded in patients with a D-dimer less than 750 μg FEU L(-1) without further testing. PATIENTS with D-dimer levels of 750 μg FEU L(-1) or higher underwent standardized imaging tests for PE. All patients in whom PE was excluded had anticoagulant therapy withheld and were followed for 3 months for venous thromboembolism (VTE). Suspected events during follow-up were adjudicated centrally. RESULTS Eight hundred and eight patients were enrolled, of whom 99 (12%) were diagnosed with VTE at presentation. Four hundred and twenty (52%) patients had a negative D-dimer level at presentation and were not treated with anticoagulants; of these, one had VTE during follow-up. The negative predictive value of D-dimer testing for PE was 99.8% (95% confidence interval, 98.7-99.9%). CONCLUSIONS A negative latex agglutination D-dimer assay is seen in about one-half of patients with suspected PE and reliably excludes PE as a stand-alone test.
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Affiliation(s)
- S M Bates
- Department of Medicine, McMaster University, Hamilton, ON, Canada
- Thrombosis and Atherosclerosis Research Institute, McMaster University, Hamilton, ON, Canada
| | - S Takach Lapner
- Department of Medicine, McMaster University, Hamilton, ON, Canada
| | - J D Douketis
- Department of Medicine, McMaster University, Hamilton, ON, Canada
- Thrombosis and Atherosclerosis Research Institute, McMaster University, Hamilton, ON, Canada
| | - C Kearon
- Department of Medicine, McMaster University, Hamilton, ON, Canada
- Thrombosis and Atherosclerosis Research Institute, McMaster University, Hamilton, ON, Canada
| | - J Julian
- Ontario Clinical Oncology Group, Juravinski Hospital, Hamilton, ON, Canada
| | - S Parpia
- Ontario Clinical Oncology Group, Juravinski Hospital, Hamilton, ON, Canada
| | - S Schulman
- Department of Medicine, McMaster University, Hamilton, ON, Canada
- Thrombosis and Atherosclerosis Research Institute, McMaster University, Hamilton, ON, Canada
| | - J I Weitz
- Department of Medicine, McMaster University, Hamilton, ON, Canada
- Thrombosis and Atherosclerosis Research Institute, McMaster University, Hamilton, ON, Canada
| | - L A Linkins
- Department of Medicine, McMaster University, Hamilton, ON, Canada
- Thrombosis and Atherosclerosis Research Institute, McMaster University, Hamilton, ON, Canada
| | - M Crowther
- Department of Medicine, McMaster University, Hamilton, ON, Canada
- Thrombosis and Atherosclerosis Research Institute, McMaster University, Hamilton, ON, Canada
| | - W Lim
- Department of Medicine, McMaster University, Hamilton, ON, Canada
- Thrombosis and Atherosclerosis Research Institute, McMaster University, Hamilton, ON, Canada
| | - F A Spencer
- Department of Medicine, McMaster University, Hamilton, ON, Canada
- Thrombosis and Atherosclerosis Research Institute, McMaster University, Hamilton, ON, Canada
| | - A Y Y Lee
- Department of Medicine, University of British Columbia, Vancouver, Canada
| | - P L Gross
- Department of Medicine, McMaster University, Hamilton, ON, Canada
- Thrombosis and Atherosclerosis Research Institute, McMaster University, Hamilton, ON, Canada
| | - J Ginsberg
- Department of Medicine, McMaster University, Hamilton, ON, Canada
- Thrombosis and Atherosclerosis Research Institute, McMaster University, Hamilton, ON, Canada
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Ji S, Ni L, Zhang J, Huang J, Zhou Z, Yu Y. [Value of three capsular antigen detection methods in diagnosis and efficacy assessment in patients with cryptococcal meningoencephalitis]. Zhonghua Yi Xue Za Zhi 2015; 95:3733-3736. [PMID: 26850011] [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] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
OBJECTIVE To assess the value of different kinds of cryptococcal capsular antigen detection methods in diagnosis and efficacy assessment in the patients with cryptococcal meningoencephalitis. METHODS From October 2012 to March 2015, cerebrospinal fluid (CSF) samples were collected from 57 patients withcentral nervous system infection who hospitalized in Sir Run Run Shaw Hospital. The cryptococcal capsular antigen in CSF was detected by Lateral flow assay (LFA), Latex agglutination test(LA) and Enzyme immunoassay (EIA). Follow-up study was achieved in 10 patients by detecting the samples of their CSF using LA and EIA, so that the dynamic changes of the antigen level could be obtained and observed during the treatment. RESULTS The sensitivity of LFA and LA were both 95%, meanwhile the specificity were both 100%; the sensitivity and specificity of EIA were both 100%. The level of cryptococcal capsular polysaccharide antigen decreased gradually with patients recovering. CONCLUSIONS All the three different methods could beof great importance for the early diagnosis of cryptococcal meningoencephalitis. LFA should be recommended for screening the disease. Follow-up study by detecting the antigen level of CSF is valued in assessing the treatment efficacy of cryptococcal diseases.
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Affiliation(s)
- Shujuan Ji
- Department of Infectious Diseases, Sir Run Run Shaw Hospital, College of Medicine, Zhejiang University, Hangzhou 310016, China
| | - Linghong Ni
- Department of Infectious Diseases, Sir Run Run Shaw Hospital, College of Medicine, Zhejiang University, Hangzhou 310016, China
| | - Junli Zhang
- Department of Infectious Diseases, Sir Run Run Shaw Hospital, College of Medicine, Zhejiang University, Hangzhou 310016, China
| | - Jun Huang
- Department of Infectious Diseases, Sir Run Run Shaw Hospital, College of Medicine, Zhejiang University, Hangzhou 310016, China
| | - Zhihui Zhou
- Department of Infectious Diseases, Sir Run Run Shaw Hospital, College of Medicine, Zhejiang University, Hangzhou 310016, China
| | - Yunsong Yu
- Department of Infectious Diseases, Sir Run Run Shaw Hospital, College of Medicine, Zhejiang University, Hangzhou 310016, China;
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Masatani T, Takashima Y, Takasu M, Matsuu A, Amaya T. Prevalence of anti-Toxoplasma gondii antibody in domestic horses in Japan. Parasitol Int 2015; 65:146-50. [PMID: 26593178 DOI: 10.1016/j.parint.2015.11.006] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [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] [Received: 10/15/2015] [Revised: 11/04/2015] [Accepted: 11/16/2015] [Indexed: 11/19/2022]
Abstract
The present study is the first report that investigated the seroprevalence of Toxoplasma gondii infection in domestic horses in various prefectures of Japan and analyzed risk factors for seropositivity. We performed a latex agglutination test for riding/racing horses from 11 prefectures in Japan (783 samples) and 4 groups of Japanese native horses (254 samples). The total seroprevalence of anti-T. gondii antibody in horses examined in this study was 4.24% (44/1037). As for riding/racing horses, we did not find a statistically different T. gondii seroprevalence between sampling prefectures. In contrast, seroprevalence of T. gondii in older horses (>21 years) was significantly higher than that in younger horses (<5 years and 11-15 years). There was no significant difference in T. gondii seroprevalence between riding/racing horses and Japanese native horses. Logistical regression analysis revealed that age, but not sex and usage, is a significant risk factor of T. gondii infection for domestic horses in Japan. These findings suggest that domesticated horses in Japan can be horizontally infected with T. gondii by ingestion of food or water contaminated with oocysts.
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Affiliation(s)
- Tatsunori Masatani
- Transboundary Animal Diseases Research Center, Joint Faculty of Veterinary Medicine, Kagoshima University, Korimoto 1-21-24, Kagoshima, Japan.
| | - Yasuhiro Takashima
- Department of Veterinary Parasitological Diseases, Faculty of Applied Biological Sciences, Gifu University, Yanagido 1-1, Gifu, Japan
| | - Masaki Takasu
- Department of Veterinary Clinical Theriogenology, Faculty of Applied Biological Sciences, Gifu University, Yanagido 1-1, Gifu, Japan
| | - Aya Matsuu
- Transboundary Animal Diseases Research Center, Joint Faculty of Veterinary Medicine, Kagoshima University, Korimoto 1-21-24, Kagoshima, Japan
| | - Tomohiko Amaya
- Yamatokohgen Animal Medical Clinic, Habikino, Osaka, Japan
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Manfreda G, Mioni R, De Cesare A. Surveillance and Characterization of Enterotoxigenic Staphylococci in Foods of Animal Origin Collected in the Veneto Region. Vet Res Commun 2015; 29 Suppl 2:331-3. [PMID: 16244987 DOI: 10.1007/s11259-005-0074-5] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Affiliation(s)
- G Manfreda
- Department of Food Science, Faculty of Agriculture, Alma Mater Studiorum, University of Bologna, Italy.
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Satzke C, Dunne EM, Porter BD, Klugman KP, Mulholland EK. The PneuCarriage Project: A Multi-Centre Comparative Study to Identify the Best Serotyping Methods for Examining Pneumococcal Carriage in Vaccine Evaluation Studies. PLoS Med 2015; 12:e1001903; discussion e1001903. [PMID: 26575033 PMCID: PMC4648509 DOI: 10.1371/journal.pmed.1001903] [Citation(s) in RCA: 83] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/26/2015] [Accepted: 10/09/2015] [Indexed: 01/17/2023] Open
Abstract
BACKGROUND The pneumococcus is a diverse pathogen whose primary niche is the nasopharynx. Over 90 different serotypes exist, and nasopharyngeal carriage of multiple serotypes is common. Understanding pneumococcal carriage is essential for evaluating the impact of pneumococcal vaccines. Traditional serotyping methods are cumbersome and insufficient for detecting multiple serotype carriage, and there are few data comparing the new methods that have been developed over the past decade. We established the PneuCarriage project, a large, international multi-centre study dedicated to the identification of the best pneumococcal serotyping methods for carriage studies. METHODS AND FINDINGS Reference sample sets were distributed to 15 research groups for blinded testing. Twenty pneumococcal serotyping methods were used to test 81 laboratory-prepared (spiked) samples. The five top-performing methods were used to test 260 nasopharyngeal (field) samples collected from children in six high-burden countries. Sensitivity and positive predictive value (PPV) were determined for the test methods and the reference method (traditional serotyping of >100 colonies from each sample). For the alternate serotyping methods, the overall sensitivity ranged from 1% to 99% (reference method 98%), and PPV from 8% to 100% (reference method 100%), when testing the spiked samples. Fifteen methods had ≥70% sensitivity to detect the dominant (major) serotype, whilst only eight methods had ≥70% sensitivity to detect minor serotypes. For the field samples, the overall sensitivity ranged from 74.2% to 95.8% (reference method 93.8%), and PPV from 82.2% to 96.4% (reference method 99.6%). The microarray had the highest sensitivity (95.8%) and high PPV (93.7%). The major limitation of this study is that not all of the available alternative serotyping methods were included. CONCLUSIONS Most methods were able to detect the dominant serotype in a sample, but many performed poorly in detecting the minor serotype populations. Microarray with a culture amplification step was the top-performing method. Results from this comprehensive evaluation will inform future vaccine evaluation and impact studies, particularly in low-income settings, where pneumococcal disease burden remains high.
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Affiliation(s)
- Catherine Satzke
- Pneumococcal Research Group, Murdoch Childrens Research Institute, Royal Children’s Hospital, Parkville, Victoria, Australia
- Department of Microbiology and Immunology, University of Melbourne, Peter Doherty Institute for Infection and Immunity, Parkville, Victoria, Australia
- * E-mail:
| | - Eileen M. Dunne
- Pneumococcal Research Group, Murdoch Childrens Research Institute, Royal Children’s Hospital, Parkville, Victoria, Australia
| | - Barbara D. Porter
- Pneumococcal Research Group, Murdoch Childrens Research Institute, Royal Children’s Hospital, Parkville, Victoria, Australia
| | - Keith P. Klugman
- Hubert Department of Global Health, Rollins School of Public Health, Emory University, Atlanta, Georgia, United States of America
| | - E. Kim Mulholland
- Pneumococcal Research Group, Murdoch Childrens Research Institute, Royal Children’s Hospital, Parkville, Victoria, Australia
- Department of Infectious Disease Epidemiology, London School of Hygiene & Tropical Medicine, London, United Kingdom
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López-Fabal MF, Gómez-Garcés JL, López-Hontangas JL, Sanz N, Muñoz C, Regodón M. Vitek MS matrix-assisted laser desorption ionization-time of flight mass spectrometry for identifying respiratory bacterial pathogens: a fast and efficient method. Rev Esp Quimioter 2015; 28:242-246. [PMID: 26437754] [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] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Mass spectrometry has become a reference resource for identifying microorganisms in clinical microbiology services. One hundred and fifty one clinical isolates were selected from respiratory specimens routinely identified as Streptococcus pneumoniae (43), Haemophilus influenzae (64) and Moraxella catarrhalis (44). These identifications were compared with other phenotypical methods and mass spectrometry (MALDI-TOF-MS Vitek). Result discrepancies were assessed by 16S rRNA sequencing. Thirty-eight of the 43 strains of S. pneumoniae (86%) were identified as such using phenotypical methods and spectrometry. In 5 cases, MALDI-TOF identified 4 of them as Streptococcus pseudopneumoniae and 1 as S. mitis/oralis. Forty-eight of the 64 strains were identified as H. influenzae (75%) using biochemical identification systems and automated identification systems, whereas MALDI-TOF-MS Vitek identified 51 strains (79%) as such. Conventional methods and spectrometry identified all the 40 strains tested (100%) as M. catarrhalis. All strains with discrepant results were sequenced, and in all cases, the identification obtained by spectrometry was confirmed. The results obtained in this study show that mass spectrometry provides identification of these bacteria faster and in a more reliable way than those based on conventional phenotypical methods.
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Affiliation(s)
| | - José Luís Gómez-Garcés
- José Luís Gómez-Garcés, Servicio de Microbiología. Hospital Universitario de Móstoles. C/ Rio Júcar s/n. 28935-Mostoles (Madrid), Spain.
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Shrestha RG, Tandukar S, Ansari S, Subedi A, Shrestha A, Poudel R, Adhikari N, Basnyat SR, Sherchand JB. Bacterial meningitis in children under 15 years of age in Nepal. BMC Pediatr 2015; 15:94. [PMID: 26286573 PMCID: PMC4541735 DOI: 10.1186/s12887-015-0416-6] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/24/2014] [Accepted: 08/13/2015] [Indexed: 01/10/2023] Open
Abstract
BACKGROUND Bacterial meningitis in children is a life-threatening problem resulting in severe morbidity and mortality. For the prompt initiation of antibacterial therapy, rapid and reliable diagnostic methods are of utmost importance. Therefore, this study was designed to find out the rate of bacterial pathogens of meningitis from suspected cases by performing conventional methods and latex agglutination. METHODS A descriptive type of study was carried out from May 2012 to April 2013. Cerebrospinal fluid (CSF) specimens from 252 suspected cases of meningitis were subjected for Gram staining, bacterial culture and latex agglutination test. The identification of growth of bacteria was done following standard microbiological methods recommended by American Society for Microbiology. Antibiotic sensitivity testing was done by modified Kirby-Bauer disk diffusion method. RESULTS From the total 252 suspected cases, 7.2 % bacterial meningitis was revealed by Gram staining and culture methods whereas latex agglutination method detected 5.6 %. Gram-negative organisms contributed the majority of the cases (72.2 %) with Haemophilus influenzae as the leading pathogen for meningitis. Overall, 33.3 % mortality rate was found. CONCLUSIONS In conclusion, a significant rate of bacterial meningitis was found in this study prompting concern for national wide surveillance.
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Affiliation(s)
- Rajani Ghaju Shrestha
- Public Health Research Laboratory, Institute of Medicine, Maharajgunj, Kathmandu, Nepal.
| | - Sarmila Tandukar
- Public Health Research Laboratory, Institute of Medicine, Maharajgunj, Kathmandu, Nepal.
| | - Shamshul Ansari
- Department of Microbiology, Chitwan Medical College, Bharatpur, Chitwan, Nepal.
| | - Akriti Subedi
- Kantipur College of Medical Science, Sitapaila, Kathmandu, Nepal.
| | - Anisha Shrestha
- Public Health Research Laboratory, Institute of Medicine, Maharajgunj, Kathmandu, Nepal.
| | - Rekha Poudel
- Central Department of Microbiology, Tribhuvan University, Kirtipur, Kathmandu, Nepal.
| | - Nabaraj Adhikari
- Kantipur College of Medical Science, Sitapaila, Kathmandu, Nepal.
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Saqib M, Hussain MH, Sajid MS, Mansoor MK, Asi MN, Fadya AAK, Zohaib A, Sial AUR, Muhammad G, Ullah I. Sero-epidemiology of equine toxoplasmosis using a latex agglutination test in the three metropolises of Punjab, Pakistan. Trop Biomed 2015; 32:276-285. [PMID: 26691256] [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: 06/05/2023]
Abstract
Toxoplasmosis is a serious threat for livestock in addition to being of zoonotic significance. In this study, serodiagnosis of equine toxoplasmosis was conducted in a randomly selected population from the 3 metropolises of Punjab, Pakistan. To this end, 272 draught equines were screened using a commercial latex agglutination assay kit. Association of probable risk factors of equine toxoplasmosis was also documented. A total of 91 (33.5%) equines were found sero-positive for Toxoplama (T.) gondii having antibody titers ranging between 1:32 to 1:612. The highest rates of seropositive cases were observed in donkeys (58.7%) followed by mules (28.6%) and horses (23.5%). Age, sex and species of draught equines were found not to be statistically (p>0.05) associated with the distribution of T. gondii antibodies. The results of the study provided a baseline data for the exposure of equine population in this area. In addition, it is recommended that the contiguous population of domestic ruminants and possible reservoirs such as feral cats should be screened in order to explore the potential risk for the human population in Pakistan.
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Affiliation(s)
- M Saqib
- Department of Veterinary Clinical Medicine and Surgery, University of Agriculture, Faisalabad-38040, Pakistan
| | - M H Hussain
- Department of Veterinary Clinical Medicine and Surgery, University of Agriculture, Faisalabad-38040, Pakistan
| | - M S Sajid
- Department of Parasitology, University of Agriculture, Faisalabad-38040, Pakistan
| | - M K Mansoor
- Institute of Microbiology, University of Agriculture, Faisalabad-38040, Pakistan
| | - M N Asi
- Department of Veterinary Clinical Medicine and Surgery, University of Agriculture, Faisalabad-38040, Pakistan
| | - A A K Fadya
- Animal Health Research Center, Ministry of Agriculture and Fisheries, Post Code 111, Sultanate of Oman
| | - A Zohaib
- State Key Laboratory of Agricultural Microbiology, Huazhong Agricultural University, Wuhan, Hubei, P. R. China
| | - A U R Sial
- Department of Veterinary Clinical Medicine and Surgery, University of Agriculture, Faisalabad-38040, Pakistan
| | - G Muhammad
- Department of Veterinary Clinical Medicine and Surgery, University of Agriculture, Faisalabad-38040, Pakistan
| | - I Ullah
- Department of Physiology, Faculty of Science and Technology, Government College University, Faisalabad, Pakistan
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Kwatra G, Adrian PV, Shiri T, Buchmann EJ, Cutland CL, Madhi SA. Natural acquired humoral immunity against serotype-specific group B Streptococcus rectovaginal colonization acquisition in pregnant women. Clin Microbiol Infect 2015; 21:568.e13-21. [PMID: 25680313 DOI: 10.1016/j.cmi.2015.01.030] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [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] [Received: 09/09/2014] [Revised: 12/24/2014] [Accepted: 01/31/2015] [Indexed: 11/17/2022]
Abstract
Group B Streptococcus (GBS) rectovaginal colonization in pregnant women is associated with invasive GBS disease in newborns, preterm delivery and stillbirths. We studied the association of GBS serotype-specific capsular polysaccharide (CPS) antibody on new acquisition and clearance of rectovaginal GBS colonization in pregnant women from 20 weeks until 37 to 40 weeks' gestation. Serum serotype-specific CPS IgG antibody concentration was measured by multiplex enzyme-linked immunosorbent assay and opsonophagocytic activity (OPA) titres. Rectovaginal swabs were evaluated for GBS colonization, using standard culture methods and serotyping by latex agglutination, at five to six weekly intervals. Higher serotype III CPS antibody concentration was associated with lower risk of rectovaginal acquisition of serotype III during pregnancy (p 0.009). Furthermore, serotype-specific OPA titres to Ia and III were higher in women who remained free of GBS colonization throughout the study compared to those who acquired the homotypic serotype (p <0.001 for both serotypes). Serum CPS IgG values of ≥1μg/mL for serotype V and ≥3μg/mL for serotypes Ia and III were significantly associated with protection against rectovaginal acquisition of the homotypic serotype. A GBS vaccine that induces sufficient capsular antibody in pregnant women, including high OPA titres, could protect against rectovaginal colonization during the latter half of pregnancy.
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Affiliation(s)
- G Kwatra
- Medical Research Council, Respiratory and Meningeal Pathogens Research Unit, University of the Witwatersrand, Johannesburg, South Africa; Department of Science and Technology/National Research Foundation, Vaccine Preventable Diseases, University of the Witwatersrand, Johannesburg, South Africa
| | - P V Adrian
- Medical Research Council, Respiratory and Meningeal Pathogens Research Unit, University of the Witwatersrand, Johannesburg, South Africa; Department of Science and Technology/National Research Foundation, Vaccine Preventable Diseases, University of the Witwatersrand, Johannesburg, South Africa
| | - T Shiri
- Medical Research Council, Respiratory and Meningeal Pathogens Research Unit, University of the Witwatersrand, Johannesburg, South Africa; Department of Science and Technology/National Research Foundation, Vaccine Preventable Diseases, University of the Witwatersrand, Johannesburg, South Africa
| | - E J Buchmann
- Department of Obstetrics and Gynecology, University of The Witwatersrand, South Africa
| | - C L Cutland
- Medical Research Council, Respiratory and Meningeal Pathogens Research Unit, University of the Witwatersrand, Johannesburg, South Africa; Department of Science and Technology/National Research Foundation, Vaccine Preventable Diseases, University of the Witwatersrand, Johannesburg, South Africa
| | - S A Madhi
- Medical Research Council, Respiratory and Meningeal Pathogens Research Unit, University of the Witwatersrand, Johannesburg, South Africa; Department of Science and Technology/National Research Foundation, Vaccine Preventable Diseases, University of the Witwatersrand, Johannesburg, South Africa; National Institute for Communicable Diseases, Division of National Health Laboratory Service, Johannesburg, South Africa.
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Mahmoud A, Sherif NA, Abdella R, El-Genedy AR, El Kateb AY, Askalani ANH. Prevalence of Trichomonas vaginalis infection among Egyptian women using culture and Latex agglutination: cross-sectional study. BMC Womens Health 2015; 15:7. [PMID: 25783642 PMCID: PMC4336703 DOI: 10.1186/s12905-015-0169-2] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [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] [Received: 04/23/2014] [Accepted: 01/22/2015] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND This is a cross-sectional study carried out in the Obstetrics and Gynecology Department at Kasr Al- Ainy Cairo University Hospitals. METHODS One thousand female patients in the child bearing period (age 18-45 yrs) were included in this study. These females were non-pregnant and non-menstruating with no douching or intercourse for at least 2-3 days, no use of antibiotics, anti-protozoal or steroids for the past 15 days complaining of vaginal discharge with or without itching, burning sensation or both. Vaginal swabs were obtained from all patients for examination by direct wet mount examination, Giemsa staining, Modified Diamond culture and latex agglutination test Kalon) to detect the presence of Trichomonas vaginalis infection. RESULTS The prevalence of trichomonas infection was 50 cases, latex agglutination test detected 50 positive cases, 30 of which were also positive by culture, and only 10 were detected both by Giemsa staining and by wet mount. The wet mount, Giemsa staining and Kalon latex test had sensitivities of 33.3, 33.3% and 100% respectively while their specificities were 100%, 100% and 97.9% respectively. CONCLUSION Screening tests should be done routinely to depict cases of T. vaginalis infection and should be included in the control programs of sexually transmitted infections. Although wet mount is not a sensitive method for diagnosis of T. vaginalis yet, it is a good positive one. Staining is only useful when there is heavy T. vaginalis infection. Latex agglutination is a highly sensitive, simple, rapid and cost effective test. It provides results within 2-3 minutes and it has the potential for use in screening and diagnosis of T. vaginalis infection.
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Affiliation(s)
- Ahmed Mahmoud
- />Department of Obstetrics and Gynecology, Faculty of Medicine, Cairo University, Cairo, Egypt
| | - Nadine A Sherif
- />Department of Obstetrics and Gynecology, Faculty of Medicine, Cairo University, Cairo, Egypt
| | - Rana Abdella
- />Department of Obstetrics and Gynecology, Faculty of Medicine, Cairo University, Cairo, Egypt
| | - Amira R El-Genedy
- />Department of Parasitology, Faculty of Medicine, Cairo University, Cairo, Egypt
| | - Abdalla Y El Kateb
- />Department of Obstetrics and Gynecology, Faculty of Medicine, Cairo University, Cairo, Egypt
| | - Ahmed NH Askalani
- />Department of Obstetrics and Gynecology, Faculty of Medicine, Cairo University, Cairo, Egypt
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dos Santos PO, Rodrigues AM, Fernandes GF, da Silva SHM, Burger E, de Camargo ZP. Immunodiagnosis of paracoccidioidomycosis due to Paracoccidioides brasiliensis using a latex test: detection of specific antibody anti-gp43 and specific antigen gp43. PLoS Negl Trop Dis 2015; 9:e0003516. [PMID: 25679976 PMCID: PMC4334539 DOI: 10.1371/journal.pntd.0003516] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [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: 10/13/2014] [Accepted: 01/03/2015] [Indexed: 11/19/2022] Open
Abstract
BACKGROUND Paracoccidioidomycosis (PCM) is a life-threatening systemic disease and is a neglected public health problem in many endemic regions of Latin America. Though several diagnostic methods are available, almost all of them present with some limitations. METHOD/PRINCIPLE FINDINGS A latex immunoassay using sensitized latex particles (SLPs) with gp43 antigen, the immunodominant antigen of Paracoccidioides brasiliensis, or the monoclonal antibody mAb17c (anti-gp43) was evaluated for antibody or antigen detection in sera, cerebrospinal fluid (CSF), and bronchoalveolar lavage (BAL) from patients with PCM due to P. brasiliensis. The gp43-SLPs performed optimally to detect specific antibodies with high levels of sensitivity (98.46%, 95% CI 91.7-100.0), specificity (93.94%, 95% CI 87.3-97.7), and positive (91.4%) and negative (98.9%) predictive values. In addition, we propose the use of mAb17c-SLPs to detect circulating gp43, which would be particularly important in patients with immune deficiencies who fail to produce normal levels of immunoglobulins, achieving good levels of sensitivity (96.92%, 95% CI 89.3-99.6), specificity (88.89%, 95% CI 81.0-94.3), and positive (85.1%) and negative (97.8%) predictive values. Very good agreement between latex tests and double immune diffusion was observed for gp43-SLPs (k = 0.924) and mAb17c-SLPs (k = 0.850), which reinforces the usefulness of our tests for the rapid diagnosis of PCM in less than 10 minutes. Minor cross-reactivity occurred with sera from patients with other fungal infections. We successfully detected antigens and antibodies from CSF and BAL samples. In addition, the latex test was useful for monitoring PCM patients receiving therapy. CONCLUSIONS/SIGNIFICANCE The high diagnostic accuracy, low cost, reduced assay time, and simplicity of this new latex test offer the potential to be commercialized and makes it an attractive diagnostic assay for use not only in clinics and medical mycology laboratories, but mainly in remote locations with limited laboratory infrastructure and/or minimally trained community health workers.
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Affiliation(s)
- Priscila Oliveira dos Santos
- Federal University of São Paulo, Department of Microbiology, Immunology and Parasitology, Cell Biology Division, São Paulo, Brazil
| | - Anderson Messias Rodrigues
- Federal University of São Paulo, Department of Microbiology, Immunology and Parasitology, Cell Biology Division, São Paulo, Brazil
| | - Geisa Ferreira Fernandes
- Federal University of São Paulo, Department of Microbiology, Immunology and Parasitology, Cell Biology Division, São Paulo, Brazil
| | | | - Eva Burger
- Federal University of Alfenas, Institute of Biomedical Sciences, Alfenas, Minas Gerais, Brazil
| | - Zoilo Pires de Camargo
- Federal University of São Paulo, Department of Microbiology, Immunology and Parasitology, Cell Biology Division, São Paulo, Brazil
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Dhagat PV, Gibbs KA, Rohde RE. Prevalence of Staphylococcus, including Methicillin-Resistant Staphylococcus aureus, in a Physical Therapy Education Facility. J Allied Health 2015; 44:215-218. [PMID: 26661700] [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] [Subscribe] [Scholar Register] [Received: 10/15/2014] [Accepted: 02/22/2015] [Indexed: 06/05/2023]
Abstract
UNLABELLED The purpose of this study was to assess the prevalence of Staphylococcus species, including methicillin-resistant Staphylococcus aureus (MRSA), in a physical therapy (PT) education facility. The PT laboratory classrooms were routinely used by graduate PT students and faculty, undergraduate anatomy students, and licensed practitioners for continuing education purposes. METHODS A total of 88 swab samples were collected from plinths and other equipment and plated onto mannitol salt agar (MSA). Suspected S. aureus colonies were confirmed by Staphyloslide latex testing. S. aureus isolates were plated to HardyCHROM agar to identify MRSA. VITEK antibiotic susceptibility testing confirmed MRSA isolates. RESULTS Forty-seven samples showed growth (47/88, 53%), and 7 tested positive for S. aureus (7/47, 15%). Of those 7, one demonstrated oxacillin resistance and was confirmed as MRSA (1/7, 2%). Remaining samples grew other species of Staphylococcus and gram-negative bacilli. DISCUSSION Given high classroom utilization, staphylococci environmental prevalence would be expected. However, the presence of MRSA was unexpected. Results demonstrate the potential for easily transmissible and potentially harmful organisms to be present in multi-use classrooms utilized by health professions students where frequent skin-to-skin contact occurs. Strict, routine cleaning of plinths and other equipment is imperative in reducing exposure risk.
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Affiliation(s)
- Priya V Dhagat
- Department of Physical Therapy, Texas State University, 601 University Drive, San Marcos, TX 78612, USA. Tel 512-245-8426, fax 512-245-8736.
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Albaina O, Sahand IH, Brusca MI, Sullivan DJ, Fernández de Larrinoa I, Moragues MD. Identification and characterization of nine atypical Candida dubliniensis clinical isolates. J Med Microbiol 2014; 64:147-156. [PMID: 25480879 DOI: 10.1099/jmm.0.078832-0] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Candida dubliniensis is a pathogenic yeast of the genus Candida closely related to Candida albicans. The phenotypic similarity of these two species often leads to misidentification of C. dubliniensis isolates in clinical samples. DNA-based methods continue to be the most effective means of discriminating accurately between the two species. Here, we report on the identification of nine unusual Candida isolates that showed ambiguous identification patterns on the basis of their phenotypic and immunological traits. The isolates were categorized into two groups. Group I isolates were unable to produce germ tubes and chlamydospores, and to agglutinate commercial latex particles coated with a mAb highly specific for C. dubliniensis. Group II isolates grew as pink and white colonies on CHROMagar Candida and ChromID Candida, respectively. Carbohydrate assimilation profiles obtained with API/ID32C together with PCR amplification with specific primers and DNA sequencing allowed reliable identification of the nine unusual clinical isolates as C. dubliniensis.
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Affiliation(s)
- Olatz Albaina
- Departamento de Inmunología, Microbiología y Parasitología, Facultad de Medicina y Odontología, University of the Basque Country UPV/EHU, Bilbao, Spain
| | - Ismail H Sahand
- Department of Microbiology, Faculty of Medicine, Hawler Medical University, Hawler, Kurdistan, Iraq
- Departamento de Inmunología, Microbiología y Parasitología, Facultad de Medicina y Odontología, University of the Basque Country UPV/EHU, Bilbao, Spain
| | - María I Brusca
- Departamento de Microbiología y Parasitología, Facultad de Odontología, Universidad de Buenos Aires, Argentina
| | - Derek J Sullivan
- Microbiology Research Laboratory, Division of Oral Biosciences, School of Dental Science and Dublin Dental University Hospital, Trinity College, Dublin 2, Ireland
| | - Iñigo Fernández de Larrinoa
- Departamento de Química Aplicada, Facultad de Ciencias Químicas, University of the Basque Country UPV/EHU, Donostia-San Sebastián, Spain
| | - María D Moragues
- Departamento de Enfermería I, Escuela Universitaria de Enfermería, University of the Basque Country UPV/EHU, Bilbao, Spain
- Departamento de Inmunología, Microbiología y Parasitología, Facultad de Medicina y Odontología, University of the Basque Country UPV/EHU, Bilbao, Spain
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JOHANSEN PE. Synovial Lining Cells and Plasma Cells in the Synovial Membrane in Cases of Classic Rheumatoid Arthritis: A Study Based Partly on Histological Sections Stained by the Methyl Green-Pyronine Method. ACTA ACUST UNITED AC 2014; 11:4-14. [PMID: 14308111 DOI: 10.3109/rhe1.1965.11.issue-1-4.01] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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Giammanco GM, Di Bartolo I, Purpari G, Costantino C, Rotolo V, Spoto V, Geraci G, Bosco G, Petralia A, Guercio A, Macaluso G, Calamusa G, De Grazia S, Ruggeri FM, Vitale F, Maida CM, Mammina C. Investigation and control of a Norovirus outbreak of probable waterborne transmission through a municipal groundwater system. J Water Health 2014; 12:452-464. [PMID: 25252349 DOI: 10.2166/wh.2014.227] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [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
During March 2011 an outbreak of gastroenteritis occurred in Santo Stefano di Quisquina, Agrigento, Sicily, Italy. Within two weeks 156 cases were identified among the 4,965 people living in the municipality. An epidemiological investigation was conducted to characterize the outbreak and target the control measures. A case was defined as a person developing diarrhea or vomiting during February 27-March 13, 2011. Stool specimens were collected from 12 cases. Norovirus (NoV) genotype GII.4 variant New Orleans 2009 was identified in stool samples from 11 of 12 cases tested (91.7%). Epidemiological investigations suggested a possible association with municipal drinking water consumption. Water samples from the public water system were tested for NoV and a variety of genotypes were detected during the first 3 months of surveillance, including GII.4 strains belonging to different variants from that involved in the gastroenteritis outbreak. Contamination of the well and springs supplying the public water network was eventually thought to be the source of the NoV contamination.
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Affiliation(s)
- Giovanni M Giammanco
- Dipartimento di Scienze per la Promozione della Salute e Materno Infantile 'G. D'Alessandro', Università di Palermo (DSHP-MCC, Department of Sciences for Health Promotion and Mother-Child Care, University of Palermo), Palermo, Italy E-mail:
| | - Ilaria Di Bartolo
- Department of Veterinary Public Health & Food Safety, Istituto Superiore di Sanità (ISS, National Institute of Health), Rome, Italy
| | - Giuseppa Purpari
- Istituto Zooprofilattico Sperimentale della Sicilia (IZS, Experimental Zooprophylactic Institute of Sicily), Palermo, Italy
| | - Claudio Costantino
- Dipartimento di Scienze per la Promozione della Salute e Materno Infantile 'G. D'Alessandro', Università di Palermo (DSHP-MCC, Department of Sciences for Health Promotion and Mother-Child Care, University of Palermo), Palermo, Italy E-mail:
| | - Valentina Rotolo
- Dipartimento di Scienze per la Promozione della Salute e Materno Infantile 'G. D'Alessandro', Università di Palermo (DSHP-MCC, Department of Sciences for Health Promotion and Mother-Child Care, University of Palermo), Palermo, Italy E-mail:
| | - Vittorio Spoto
- Azienda Sanitaria Provinciale di Agrigento, Dipartimento di Prevenzione (ASP, Local Health Authority of Agrigento, Department of Prevention), Agrigento, Italy
| | - Gaetano Geraci
- Azienda Sanitaria Provinciale di Agrigento, Dipartimento di Prevenzione (ASP, Local Health Authority of Agrigento, Department of Prevention), Agrigento, Italy
| | - Girolama Bosco
- Azienda Sanitaria Provinciale di Agrigento, Dipartimento di Prevenzione (ASP, Local Health Authority of Agrigento, Department of Prevention), Agrigento, Italy
| | - Agata Petralia
- Azienda Sanitaria Provinciale di Agrigento, Dipartimento di Prevenzione (ASP, Local Health Authority of Agrigento, Department of Prevention), Agrigento, Italy
| | - Annalisa Guercio
- Istituto Zooprofilattico Sperimentale della Sicilia (IZS, Experimental Zooprophylactic Institute of Sicily), Palermo, Italy
| | - Giusi Macaluso
- Istituto Zooprofilattico Sperimentale della Sicilia (IZS, Experimental Zooprophylactic Institute of Sicily), Palermo, Italy
| | - Giuseppe Calamusa
- Dipartimento di Scienze per la Promozione della Salute e Materno Infantile 'G. D'Alessandro', Università di Palermo (DSHP-MCC, Department of Sciences for Health Promotion and Mother-Child Care, University of Palermo), Palermo, Italy E-mail:
| | - Simona De Grazia
- Dipartimento di Scienze per la Promozione della Salute e Materno Infantile 'G. D'Alessandro', Università di Palermo (DSHP-MCC, Department of Sciences for Health Promotion and Mother-Child Care, University of Palermo), Palermo, Italy E-mail:
| | - Franco M Ruggeri
- Department of Veterinary Public Health & Food Safety, Istituto Superiore di Sanità (ISS, National Institute of Health), Rome, Italy
| | - Francesco Vitale
- Dipartimento di Scienze per la Promozione della Salute e Materno Infantile 'G. D'Alessandro', Università di Palermo (DSHP-MCC, Department of Sciences for Health Promotion and Mother-Child Care, University of Palermo), Palermo, Italy E-mail:
| | - Carmelo M Maida
- Dipartimento di Scienze per la Promozione della Salute e Materno Infantile 'G. D'Alessandro', Università di Palermo (DSHP-MCC, Department of Sciences for Health Promotion and Mother-Child Care, University of Palermo), Palermo, Italy E-mail:
| | - Caterina Mammina
- Dipartimento di Scienze per la Promozione della Salute e Materno Infantile 'G. D'Alessandro', Università di Palermo (DSHP-MCC, Department of Sciences for Health Promotion and Mother-Child Care, University of Palermo), Palermo, Italy E-mail:
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N'Guessan K, Dassé SR, Yébouah OR, Kouacou APV, Séka SJ. [Heterophile interference: an experimental method of depleting rheumatoid factor from sera in Abidjan, Côte d'Ivoire]. Med Sante Trop 2014; 24:275-278. [PMID: 25370047 DOI: 10.1684/mst.2013.0263] [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] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Rheumatoid factor (RF) is a major source of interference in immunoassays. Several methods have been proposed to eliminate interference. We experimented with a new technique based on the depletion of rheumatoid factor from serum samples. Our study included 150 samples, 64 of them positive for RF. Depletion was performed by the adsorption of RF from the sample by latex beads sensitized with human IgG anti-RF. After precipitation of the complexes formed, the supernatant was tested for RF. Finally, we assessed the performance of this RF depletion method with two tests: ELISA Enzygnost Enzygnost anti-HBs micro-Behring and IFI falciparum Ref 75521 Biomerieux. We compared the percentages of false-negative and false-positive results of these tests before and after depletion of the RF-positive serum samples. Efficiency index is 92.2% and the performance of the two immunoassay tests improved significantly by a factor of 2 to 25 after depletion. In addition, this technique is easy, inexpensive, fast, and suitable to our limited resources as a developing country. It should be extended to other immunological tests for validation of the results.
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Affiliation(s)
- K N'Guessan
- Service d'immunologie, centre hospitalier universitaire de Cocody, université Félix Houphouët-Boigny, B V166, 01 Abidjan, Côte d'Ivoire
| | - S R Dassé
- Service d'immunologie, centre hospitalier universitaire de Cocody, université Félix Houphouët-Boigny, B V166, 01 Abidjan, Côte d'Ivoire
| | - O R Yébouah
- Service d'immunologie, centre hospitalier universitaire de Cocody, université Félix Houphouët-Boigny, B V166, 01 Abidjan, Côte d'Ivoire
| | - A P V Kouacou
- Service d'immunologie, centre hospitalier universitaire de Cocody, université Félix Houphouët-Boigny, B V166, 01 Abidjan, Côte d'Ivoire
| | - S J Séka
- Service d'immunologie, CHU de Bouaké, université Allassane, Ouattara, Côte d'Ivoire
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Kwatra G, Adrian PV, Shiri T, Buchmann EJ, Cutland CL, Madhi SA. Serotype-specific acquisition and loss of group B streptococcus recto-vaginal colonization in late pregnancy. PLoS One 2014; 9:e98778. [PMID: 24979575 PMCID: PMC4076185 DOI: 10.1371/journal.pone.0098778] [Citation(s) in RCA: 64] [Impact Index Per Article: 6.4] [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: 01/18/2014] [Accepted: 05/06/2014] [Indexed: 12/04/2022] Open
Abstract
Background Maternal recto-vaginal colonization with Group B Streptococcus (GBS) and consequent vertical transmission to the newborn predisposes neonates to early-onset invasive GBS disease. This study aimed to determine the acquisition and loss of serotype-specific recto-vaginal GBS colonization from 20–37+ weeks of gestational age. Methods Vaginal and rectal swabs were collected from HIV-uninfected women at 20–25 weeks of gestation age and at 5–6 weekly intervals thereafter. Swabs were cultured for GBS and isolates were serotyped by latex agglutination. Serologically non-typable isolates and pilus islands were characterized by PCR. Results The prevalence of recto-vaginal GBS colonization was 33.0%, 32.7%, 28.7% and 28.4% at 20–25 weeks, 26–30 weeks, 31–35 weeks and 37+ weeks of gestational age, respectively. The most common identified serotypes were Ia (39.2%), III (32.8%) and V (12.4%). Of 507 participants who completed all four study visits, the cumulative overall recto-vaginal acquisition rate of new serotypes during the study was 27.9%, including 11.2%, 8.2% and 4.3% for serotypes Ia, III and V, respectively. Comparing the common colonizing serotypes, serotype III was more likely to be associated with persistent colonization throughout the study (29%) than Ia (18%; p = 0.045) or V (6%; p = 0.002). The median duration of recto-vaginal GBS colonization for serotype III was 6.35 weeks, which was longer than other serotypes. Pilus island proteins were detected in all GBS isolates and their subtype distribution was associated with specific serotypes. Conclusion South African pregnant women have a high prevalence of GBS recto-vaginal colonization from 20 weeks of gestational age onwards, including high GBS acquisition rates in the last pregnancy-trimesters. There are differences in specific-serotype colonization patterns during pregnancy.
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Affiliation(s)
- Gaurav Kwatra
- Department of Science and Technology/National Research Foundation: Vaccine Preventable Diseases, University of the Witwatersrand, Johannesburg, South Africa
- MRC, Respiratory and Meningeal Pathogens Research Unit, University of the Witwatersrand, Johannesburg, South Africa
| | - Peter V. Adrian
- Department of Science and Technology/National Research Foundation: Vaccine Preventable Diseases, University of the Witwatersrand, Johannesburg, South Africa
- MRC, Respiratory and Meningeal Pathogens Research Unit, University of the Witwatersrand, Johannesburg, South Africa
- * E-mail:
| | - Tinevimbo Shiri
- Department of Science and Technology/National Research Foundation: Vaccine Preventable Diseases, University of the Witwatersrand, Johannesburg, South Africa
- MRC, Respiratory and Meningeal Pathogens Research Unit, University of the Witwatersrand, Johannesburg, South Africa
| | - Eckhart J. Buchmann
- Department of Obstetrics and Gynaecology, University of the Witwatersrand, Johannesburg, South Africa
| | - Clare L. Cutland
- Department of Science and Technology/National Research Foundation: Vaccine Preventable Diseases, University of the Witwatersrand, Johannesburg, South Africa
- MRC, Respiratory and Meningeal Pathogens Research Unit, University of the Witwatersrand, Johannesburg, South Africa
| | - Shabir A. Madhi
- Department of Science and Technology/National Research Foundation: Vaccine Preventable Diseases, University of the Witwatersrand, Johannesburg, South Africa
- MRC, Respiratory and Meningeal Pathogens Research Unit, University of the Witwatersrand, Johannesburg, South Africa
- National Institute for Communicable Diseases: a division of National Health Laboratory Service, Johannesburg, South Africa
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Mahelová M, Růžička F. [Candida dubliniensis in clinical specimens and possibilities for identification]. Epidemiol Mikrobiol Imunol 2014; 63:125-129. [PMID: 25025678] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
STUDY OBJECTIVE The species Candida dubliniensis shares a wide range of phenotypic characteristics with Candida albicans, the most common yeast species isolated from clinical specimens. This is a considerable complication for the detection and identification of Candida dubliniensis from clinical specimens. The lack of data on the incidence of C. dubliniensis in the Czech Republic was the motivation behind the efforts to detect this pathogen in specimens analyzed at the Institute for Microbiology, Faculty of Medicine Masaryk University and St. Anne's Faculty Hospital in Brno. Another aim was to test the reliability of the culture methods used. MATERIAL AND METHODS Altogether 2260 yeast isolates initially identified as C. albicans were analysed. To differentiate C. dubliniensis from C. albicans, four phenotypic methods were used: colour-based differentiation on CHROMagar Candida medium, culture on medium with 6.5% of NaCl, growth at 42 °C, and colony characteristics on Staib agar. To verify the results, the Bichro-Dubli Fumouze latex agglutination test and species-specific polymerase chain reactions (PCR) were used. RESULTS Using phenotypic methods, latex agglutination, and PCR, 50 (2.2%) strains from the study set were assigned to C. dubliniensis. Most (31) C. dubliniensis isolates were recovered from the respiratory tract and the remaining others were three urine isolates, four stool isolates, one central venous catheter isolate, and one blood isolate. With the exception of colour-based differentiation on CHROMagar Candida medium showing a specificity of 85.5%, all the culture methods used have a high sensitivity and a high specificity. CONCLUSION Identification of C. dubliniensis as C. albicans was confirmed in various clinical specimens, most often from the upper respiratory tract. The colour-based differentiation of C. dubliniensis from C. albicans on chromogenic CHROMagar Candida medium can only be recommended as a screening test for the differentiation of C. dubliniensis from other species of the genus Candida. The remaining three methods are highly reliable. The final identification should be based on a combination of these methods, with the species-specific PCR or latex agglutination test used for verification.
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Abstract
We surveyed the contamination of 315 Japanese- and western-style desserts and 247 human hands by Staphylococcus aureus and other staphylococcal bacteria. The most frequently isolated staphylococcal bacterium was S. warneri, followed by S. aureus. Only 1.9% of western-style desserts were contaminated by S. aureus strains, while 19.4% and 13.0% of Japanese-style desserts and human hands respectively were contaminated. Ninety-four isolates of S. aureus were characterized as to their biological properties and enterotoxigenicity. Although staphylococcal enterotoxins (SEs) were detected by enzyme-linked immunosorbent assay in the cultured broth of all S. aureus isolates, the reversed passive latex agglutination method and the polymerase chain reaction showed only 39 (41.5%) and 40 (42.6%) samples respectively as SE-positive. The predominant type of SE was SEB (67.5%), and eight strains produced SEA. None of the S. aureus strains had penicillin-binding protein 2', showing that methicillin-resistant S. aureus was not present in the samples.
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Affiliation(s)
- Yuko Shimamura
- Department of Nutrition and Food Science, Ochanomizu University, Tokyo 112-8610, Japan
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Pogosian GG, Mikaelian MV, Avagian AK, Gasparian VK. [The annexin 5 in serums of pregnant women and patients with particular types of cancer]. Klin Lab Diagn 2014:14-17. [PMID: 25080795] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
The detection of biomarkers to be applied to reveal different types of tumors is an actual demand of today. Since course of this disease can be asymptomatic these kinds of markers can be applied in widely-distributed screening procedures. Many types of biomarkers for detection of cancer exist. However all these markers are specific only for particular type of tumor and have no use in screening procedures for detection of this pathology. The Annexin 5, a Ca-depended phospholipid binding protein, was discovered in serums of all pregnant women on various stages of pregnancy. The study was implemented using method of latex agglutination. More than that, this protein was detected in serums of patients with several types of cancer. The possibility to apply annexin 5 as marker for screening of various types of cancer is considered.
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Miranda-Ulloa E, Sandoval-Ahumada R, Ayala E, Vásquez-Ampuero J. [Assessment of dot blot tests and latex agglutination for cysticercosis diagnostic in Peru]. Rev Peru Med Exp Salud Publica 2014; 31:297-301. [PMID: 25123870] [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] [Received: 04/11/2014] [Accepted: 06/11/2014] [Indexed: 06/03/2023] Open
Abstract
In order to evaluate dot blot tests and latex agglutination for the detection of human cysticercosis with liquid antigen of Taenia solium cysticerci, 125 human sera were used, of which 60 were from people with cysticercosis confirmed by Western Blot, 45 with other parasitic diseases and 20 apparently healthy. The optimal concentration of antigen to impregnate dot blot strips was 0.01 ug/uL, and to impregnate the latex particles was 0.092 ug/uL. For the dot blot test, a sensitivity of 100% and specificity of 87.7% was found. For latex agglutination, a sensitivity of 93.3% and specificity of 89.2% was found. Both tests may be useful and feasible to implement alternatives of serological diagnosis in laboratories in endemic areas of Peru.
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Affiliation(s)
| | | | - Eduardo Ayala
- Centro Nacional de Salud Pública, Instituto Nacional de Salud, Lima, Perú
| | - Juan Vásquez-Ampuero
- Facultad de Medicina Veterinaria, Universidad Nacional Hermilio Valdizán, Huánuco, Perú
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Abstract
Toxoplasma gondii is an obligate intracellular apicomplexan parasite that causes abortion and reproductive disorder in domestic animals. T. gondii is a common worldwide disease in homeothermic animals, including birds and humans. The aim of the present study was to determine the presence of antibodies against T. gondii in the armadillo Chaetophractus villosus in the province of La Pampa, Argentina. Serum samples were collected from 150 individuals (70 males and 80 females). For serological detection of T. gondii, a latex agglutination test was first performed and then positive sera were confirmed with an indirect hemagglutination test, using 1:4 to 1:64 dilutions. Results showed that 27% (41) of the samples presented titers for antibodies against T. gondii. There were not significant differences between the presence of antibodies against T. gondii and age or sexes of the armadillos. Results show that presence of T. gondii antibodies in armadillos were associated with presence of pigs, and sheep, however there was not association with chickens and dairy cattle in capture site. T. gondii has an important presence in C. villosus population, suggesting a potential zoonotic risk for humans and wildlife animals when C. villosus meats are consumed raw or undercooked. This is the first record of the presence of antibodies against T. gondii in C. villosus.
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Scharek P, Jekkel C, Budai J, Szilasi Z, Helferich F, Arva I, Váradi A, Létay E, Katona K, Rókusz L. [Pneumococcal meningitis in a pregnant woman]. Ideggyogy Sz 2014; 67:56-58. [PMID: 24654448] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Bacterial meningitis is a life-threatening disease. The incidence of meningitis is about 2.6-6 cases per 100.000 adults per year in developed countries. The most common causative microorganisms are Sreptococcus pneumoniae and Neisseria meningitidis. A 33-year-old multigravida, at 24 week of gestation was admitted to the hospital because of ear pain, haedache, fever and confusion. Lumbal puncture was performed and cerebrospinal fluid analysis showed signs of bacterial meningitis. Latex agglutination test was positive for S. pneumoniae, Gram-positive diplococci have seen under microscope and later cultivation verified S. pneumoniae as the causative agent. After ceftriaxon, dexamethasone administration and treatment in intensive care unit, left side mastoidectomy was performed since cranial computed tomography showed acut exacerbation of chronic mastoiditis on the left side. After extubation, mobilisation and 14 days antibiotic treatment the patient, who had residual hearing loss on the left side, was discharged from the hospital. During the treatment the foetal parameters were normal. The patient at 39 week of gestation gave birth to a healthy infant. Forty-eight case reports have been published in this topic around the world until April, 2012. The most common causative agents were S. pneumoniae and Listeria monocytogenes. Because of the little amount of data, it is hard to appreciate the actual incidence and prognosis of this life-threatening illness both for mother and infant. As far as we know this is the first published case report of meningitis during pregnancy in Hungary. By this article we would like to draw attention to the importance of teamwork, of prevention of brain abscess formation and of the removal of the infection's focus.
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