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Bibi N, Zaidi NUSS, Tahir M, Babar MM. Vaccinomics driven proteome-wide screening of Haemophilus influenzae for the prediction of common putative vaccine candidates. Can J Microbiol 2021; 67:799-812. [PMID: 34237220 DOI: 10.1139/cjm-2020-0535] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Haemophilus influenzae colonizes the respiratory tract and is associated with life-threatening invasive infections. The recent rise in its global prevalence, even in the presence of multiple vaccines, indicate an urgent need for developing cross-strain effective vaccine strategies. Our work focused on identifying the universally conserved antigenic regions of H. influenzae that can be used for developing new vaccines. A variety of bioinformatics tools were applied for the comprehensive geno-proteomic analysis of H. influenzae type "a" strain, as reference serotype, through which subcellular localization, essentiality, virulence, and non-host homology were determined. B and T-Cell epitope mapping of 3D protein structures were performed. Thereafter, molecular docking with HLA DRB1*0101 and comparative genome analysis established the candidature of identified regions. Based on the established vaccinomics criteria, five target proteins were predicted as novel vaccine candidates. Among these, 9 epitopic regions were identified that could regulate the lymphocyte activity through strong protein-protein interactions. Comparative genomic analysis exhibited that the identified regions were highly conserved among the different strains of H. influenzae. Based on multiple immunogenic factors, the five prioritized proteins and their predicted epitopes were identified as the ideal common putative vaccine candidate against typeable strains.
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Affiliation(s)
- Naseeha Bibi
- National University of Sciences and Technology, 66959, Atta-ur-Rahman School of Applied Biosciences, Islamabad, ICT, Pakistan;
| | - Najam-Us-Sahar Sadaf Zaidi
- National University of Sciences and Technology, 66959, Atta-ur-Rahman School of Applied Biosciences, H-12, Srinagar Highway,, Islamabad. Pakistan, Islamabad, ICT, Pakistan, 44000;
| | - Muhammad Tahir
- National University of Sciences and Technology, 66959, Atta-ur-Rahman School of Applied Biosciences, Islamabad, ICT, Pakistan;
| | - Mustafeez Mujtaba Babar
- Shifa Tameer-e-Millat University, 384986, Shifa College of Pharmaceutical Sciences, Shifa Tameer-e-Millat University, Plot No. 72, Adjacent FBISE, H-8/4, Islamabad, Islamabad, Pakistan, 44000;
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Cox AD, Kuo Lee R, Ulanova M, Bruce MG, Tsang RSW. Proceedings of a workshop to discuss the epidemiology of invasive Haemophilus influenzae disease with emphasis on serotype a and b in the Americas, 2019. Vaccine 2020; 39:627-632. [PMID: 33358264 DOI: 10.1016/j.vaccine.2020.12.015] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2020] [Revised: 11/22/2020] [Accepted: 12/03/2020] [Indexed: 11/24/2022]
Abstract
On March 9, 2019, a one-day workshop titled "The current epidemiology of invasive Haemophilus influenzae disease in the Americas", jointly organized by the Public Health Agency of Canada (PHAC), the Canadian Institute of Health Research (CIHR), and the National Research Council Canada (NRC), brought together experts in the epidemiology and surveillance of invasive Haemophilus influenzae (Hi) disease from the Pan American Health Organization (PAHO) and its five regional reference laboratories in South America, USA, and Canada in Ottawa, Ontario, Canada. This workshop built upon recommendations of previous related workshops and incorporated updated data.
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Affiliation(s)
- A D Cox
- National Research Council, Ottawa, Ontario, Canada
| | - R Kuo Lee
- National Research Council, Ottawa, Ontario, Canada
| | - M Ulanova
- Northern Ontario School of Medicine, Lakehead University, Thunder Bay, Ontario, Canada
| | - M G Bruce
- Artic Investigation Program, Division of Preparedness and Emerging Infections, US Centers for Disease Control and Prevention (CDC), Anchorage, AK, U.S.A
| | - R S W Tsang
- National Microbiology Laboratory, Public Health Agency of Canada, Winnipeg, Manitoba, Canada.
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Tsang RSW, Ulanova M. The changing epidemiology of invasive Haemophilus influenzae disease: Emergence and global presence of serotype a strains that may require a new vaccine for control. Vaccine 2017; 35:4270-4275. [PMID: 28666758 DOI: 10.1016/j.vaccine.2017.06.001] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2017] [Revised: 05/23/2017] [Accepted: 06/01/2017] [Indexed: 10/19/2022]
Abstract
BACKGROUND More than two decades after the implementation of the Hib conjugate vaccine in North America, Haemophilus influenzae serotype a (Hia) has emerged as a significant cause of invasive disease in Indigenous communities. However, little is known about the global presence of this pathogen. METHODS We interrogated the H. influenzae Multi-Locus Sequence Typing (MLST) website (https://pubmlst.org/hinfluenzae/) by selecting for serotype a records. We also updated our previous literature review on this subject matter. RESULTS Hia has been reported from at least 35 countries on six major continents. However, most Hia diseases were associated with Indigenous communities. Clonal analysis identified two clonal populations with one typified as ST-23 responsible for most invasive disease in North America and being the predominant clone described on the H. influenzae MLST website. Incidence of invasive Hia disease in Indigenous communities in North America are similar to the rates of Hib disease reported prior to the Hib conjugate vaccine era. Hia causes severe clinical diseases, such as meningitis, septicaemia, pneumonia, and septic arthritis with case-fatality rates between 5.6% and 33% depending on the age of the patient and the genetic makeup of the Hia strain. CONCLUSION Although invasive Hia disease can be found globally, the current epidemiological data suggest that this infection predominantly affects Indigenous communities in North America. The clinical disease of Hia and the clonal nature of the bacteria resemble that of Hib. The high incidence of invasive Hia disease in Indigenous communities, along with potential fatality and severe sequelae causing long-term disability in survivors, may support the development of a new Hia conjugate vaccine for protection against this infection similar in design to the one introduced in the 1990s to control invasive Hib disease.
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Affiliation(s)
- Raymond S W Tsang
- Vaccine Preventable Bacterial Diseases, National Microbiology Laboratory, Public Health Agency of Canada, Winnipeg, Manitoba, Canada.
| | - Marina Ulanova
- Northern Ontario School of Medicine, Lakehead University, Thunder Bay, Ontario, Canada
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Characteristics of invasive Haemophilus influenzae serotype a (Hia) from Nunavik, Canada and comparison with Hia strains in other North American Arctic regions. Int J Infect Dis 2017; 57:104-107. [DOI: 10.1016/j.ijid.2017.02.003] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2016] [Revised: 02/02/2017] [Accepted: 02/05/2017] [Indexed: 11/21/2022] Open
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Tsang RSW, Li YA, Mullen A, Baikie M, Whyte K, Shuel M, Tyrrell G, Rotondo JAL, Desai S, Spika J. Laboratory characterization of invasive Haemophilus influenzae isolates from Nunavut, Canada, 2000-2012. Int J Circumpolar Health 2016; 75:29798. [PMID: 26765260 PMCID: PMC4712320 DOI: 10.3402/ijch.v75.29798] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2015] [Revised: 11/30/2015] [Accepted: 12/07/2015] [Indexed: 11/14/2022] Open
Abstract
BACKGROUND With invasive Haemophilus influenzae serotype b (Hib) disease controlled by vaccination with conjugate Hib vaccines, there is concern that invasive disease due to non-serotype b strains may emerge. OBJECTIVE This study characterized invasive H. influenzae (Hi) isolates from Nunavut, Canada, in the post-Hib vaccine era. METHODS Invasive H. influenzae isolates were identified by conventional methods at local hospitals; and further characterized at the provincial and federal public health laboratories, including detection of serotype antigens and genes, multi-locus sequence typing and antibiotic susceptibility. RESULTS Of the 89 invasive H. influenzae cases identified from 2000 to 2012, 71 case isolates were available for study. There were 43 serotype a (Hia), 12 Hib, 2 Hic, 1 Hid, 1 Hie, 2 Hif and 10 were non-typeable (NT). All 43 Hia were biotype II, sequence type (ST)-23. Three related STs were found among the Hib isolates: ST-95 (n=9), ST-635 (n=2) and ST-44 (n=1). Both Hif belonged to ST-124 and the 2 Hic were typed as ST-9. The remaining Hid (ST-1288) and Hie (ST-18) belonged to 2 separate clones. Of the 10 NT strains, 3 were typed as ST-23 and the remaining 7 isolates each belonged to a unique ST. Eight Hib and 1 NT-Hi were found to be resistant to ampicillin due to β-lactamase production. No resistance to other antibiotics was detected. CONCLUSION During the period of 2000-2012, Hia was the predominant serotype causing invasive disease in Nunavut. This presents a public health concern due to an emerging clone of Hia as a cause of invasive H. influenzae disease and the lack of published guidelines for the prophylaxis of contacts. The clonal nature of Hia could be the result of spread within an isolated population, and/or unique characteristics of this strain to cause invasive disease. Further study of Hia in other populations may provide important information on this emerging pathogen. No antibiotic resistance was detected among Hia isolates; a small proportion of Hib and NT-Hi isolates demonstrated resistance to ampicillin due to β-lactamase production.
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Affiliation(s)
- Raymond S W Tsang
- National Microbiology Laboratory, Public Health Agency of Canada, Winnipeg, Manitoba;
| | - Y Anita Li
- Centre for Immunization and Respiratory Infectious Diseases, Public Health Agency of Canada, Ottawa, Ontario
| | - Angie Mullen
- Department of Health, Government of Nunavut, Iqaluit, Nunavut
| | - Maureen Baikie
- Department of Health, Government of Nunavut, Iqaluit, Nunavut;
| | - Kathleen Whyte
- National Microbiology Laboratory, Public Health Agency of Canada, Winnipeg, Manitoba
| | - Michelle Shuel
- National Microbiology Laboratory, Public Health Agency of Canada, Winnipeg, Manitoba
| | - Gregory Tyrrell
- Provincial Laboratory for Public Health, Edmonton, Alberta, Canada
| | - Jenny A L Rotondo
- Centre for Immunization and Respiratory Infectious Diseases, Public Health Agency of Canada, Ottawa, Ontario
| | - Shalini Desai
- Centre for Immunization and Respiratory Infectious Diseases, Public Health Agency of Canada, Ottawa, Ontario
| | - John Spika
- Centre for Immunization and Respiratory Infectious Diseases, Public Health Agency of Canada, Ottawa, Ontario
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Whyte K, Levett PN, Horsman GB, Chokani K, Hayden K, Shuel M, Tsang RSW. Recurrent invasive Haemophilus influenzae serotype a infection in an infant. ACTA ACUST UNITED AC 2015. [DOI: 10.7243/2052-6180-3-4] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Desai S, Tsang R, St. Laurent M, Cox A. Collaboration on a public health-driven vaccine initiative. CANADA COMMUNICABLE DISEASE REPORT = RELEVE DES MALADIES TRANSMISSIBLES AU CANADA 2014; 40:365-368. [PMID: 29769865 PMCID: PMC5864475 DOI: 10.14745/ccdr.v40i17a04] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
Disease surveillance can be used as an opportunity to determine priorities for research and the development of new therapeutics. This is evident in the work underway to develop a new vaccine to combat a serious invasive childhood disease: Haemophilus influenzae serotype a (Hia). Following the introduction of Hib vaccine into the routine childhood immunization schedule in Canada in the early 1990's, the Public Health Agency of Canada (PHAC) began to document the dropping rates of H influenzae serotype b (Hib) infection. However, invasive H. influenzae diseases due to non-Hib strains began to increase and in 2007, surveillance for invasive H. influenzae disease due to all serotypes as well as non-typeable strains was initiated. Current data suggests Hia is a cause of serious invasive disease, particularly in Aboriginal populations. Similar to Hib, Hia causes severe illnesses such as meningitis, sepsis and bacteremic pneumonia in young children under the age of five. Given the emerging threat due to Hia in Aboriginal populations in Canada, PHAC formed a partnership with the National Research Council of Canada (NRC) to investigate the potential of creating a capsular polysaccharide vaccine against Hia. At the present time, candidate vaccine seed strains have been identified and PHAC and the NRC are working with the Northern Ontario School of Medicine, the US Centers for Disease Control and Prevention and others. The goal of this research is to identify and prepare a candidate vaccine against Hia while increasing the understanding of how such a vaccine would improve the health of a vulnerable population.
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Affiliation(s)
- S Desai
- Center for Immunization and Respiratory Infectious Diseases, Public Health Agency of Canada, Ottawa, ON
| | - R Tsang
- National Microbiology Laboratory, Public Health Agency of Canada, Winnipeg, MB
| | - M St. Laurent
- Center for Immunization and Respiratory Infectious Diseases, Public Health Agency of Canada, Ottawa, ON
| | - A Cox
- Vaccine Program, Human Health Therapeutics, National Research Council of Canada, Ottawa, ON
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Shuel M, Whyte K, Drew T, Wylie J, Lefebvre B, Hoang L, Tsang RSW. Differential susceptibility of invasive Haemophilus influenzae serotype a and serotype b to ampicillin and other commonly prescribed antibiotics. Lett Appl Microbiol 2014; 59:193-9. [PMID: 24712310 DOI: 10.1111/lam.12265] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2013] [Revised: 04/03/2014] [Accepted: 04/03/2014] [Indexed: 12/17/2022]
Abstract
UNLABELLED Haemophilus influenzae serotype a (Hia) has become an important pathogen in the post-H. influenzae serotype b (Hib) vaccine era. Antibiotic resistance in H. influenzae is a global phenomenon, but few studies have looked at antibiotic resistance profiles with regard to serotype. Invasive Hia (n = 157), noninvasive Hia (n = 2) and invasive Hib (n = 42) collected over the last two decades from three Canadian Provinces were examined for resistance to several commonly prescribed antibiotics, and sequence types (STs) were determined by MLST. Only 1·9% of Hia showed antibiotic resistance, while 31% of Hib were resistant to one or more antibiotic. Resistance to ampicillin, sulfamethoxazole-trimethoprim, chloramphenicol and tetracycline was observed, with β-lactamase-mediated ampicillin resistance being the most common. Nine STs were identified for Hia with 7 STs belonging to the same clonal complex. Ten STs were observed in Hib strains, and all of them belonged to a single clonal complex. A possible correlation between sequence type and ampicillin resistance was observed for Hib, while no correlations were observed for Hia. SIGNIFICANCE AND IMPACT OF THE STUDY Despite H. influenzae serotype b (Hib) vaccine programs, invasive disease due to Hib still exists in Canada and is either second or third most common behind nontypeable and/or serotype a (Hia). Many previous studies on antibiotic resistance have focussed on respiratory isolates, and few have looked at resistance with regard to serotype. This study analysed antibiotic resistance in invasive Hia and Hib collected over 20 years from three provinces, and results found that significantly more Hib showed resistance compared to Hia. This provides a small snapshot of H. influenzae disease in Canada and highlights the importance to continually monitor antibiotic resistance profiles.
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Affiliation(s)
- M Shuel
- Vaccine Preventable Bacterial Diseases Division, National Microbiology Laboratory, Public Health Agency of Canada, Winnipeg, MB, Canada
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Tsang RS, Shuel M, Wylie J, Lefebvre B, Hoang L, Law DK. Population genetics of Haemophilus influenzae serotype a in three Canadian provinces. Can J Microbiol 2013; 59:362-4. [DOI: 10.1139/cjm-2013-0156] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
Haemophilus influenzae serotype a (Hia) is an important pathogen since the introduction of vaccines for control of disease due to serotype b strains. Using a sodC-based polymerase chain reaction, Hia can be divided into 2 phylogenetic divisions, each with their own unique multilocus sequence types. Most Canadian Hia belongs to clonal division I and the ST-23 clonal complex. The recently described hypervirulent clone of ST-4 was found in a single Canadian isolate. Therefore, surveillance of invasive H. influenzae disease should include serotyping to detect Hia and multilocus sequence typing to detect hypervirulent clones.
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Affiliation(s)
- Raymond S.W. Tsang
- Vaccine Preventable Bacterial Diseases Division, National Microbiology Laboratory, Public Health Agency of Canada, 1015 Arlington Street, Winnipeg, MB R3E 3R2, Canada
| | - Michelle Shuel
- Vaccine Preventable Bacterial Diseases Division, National Microbiology Laboratory, Public Health Agency of Canada, 1015 Arlington Street, Winnipeg, MB R3E 3R2, Canada
| | - John Wylie
- Cadham Provincial Laboratory, Manitoba Health, Winnipeg, MB R3C 3Y1, Canada
| | - Brigitte Lefebvre
- Laboratoire de santé publique du Québec, Sainte-Anne-de-Bellevue, QC H9X 3R5, Canada
| | - Linda Hoang
- Public Health Microbiology and Reference Laboratory, BC Centre for Disease Control, Vancouver, BC V5Z 4R4, Canada
| | - Dennis K.S. Law
- Vaccine Preventable Bacterial Diseases Division, National Microbiology Laboratory, Public Health Agency of Canada, 1015 Arlington Street, Winnipeg, MB R3E 3R2, Canada
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