Canada communicable disease report = Releve des maladies transmissibles au Canada最新文献

{"title":"Opportunities and lessons learned from a retrospective analysis of administrative billing data to understand the language profile of high-risk close contacts of COVID-19 cases in Ontario.","authors":"Andrea Chambers, Mark A Cachia, Jessica P Hopkins","doi":"10.14745/ccdr.v50i10a06","DOIUrl":"10.14745/ccdr.v50i10a06","url":null,"abstract":"<p><strong>Background: </strong>During a public health emergency, it is vital to have access to data sources that can identify communities disproportionately affected and to ensure public health communications are meeting the needs of diverse populations.</p><p><strong>Objective: </strong>To explore how administrative billing data for language interpretation services could be used as an additional source of information to understand the language profile of high-risk close contacts of COVID-19 cases.</p><p><strong>Methods: </strong>A retrospective descriptive analysis was conducted using administrative billing data from Public Health Ontario's Contact Tracing Initiative from May 2020 to February 2022. Data from the Contact Tracing Initiative were utilized to identify drivers that could have influenced patterns in language interpretation requests. Trends were compared with community language profiles using 2021 Canadian Census data.</p><p><strong>Results: </strong>Interpreters responded to 2,604 requests across 38,518 interpretation minutes and provided information in 50 different languages. The top five requested languages were French, Arabic, Spanish, Punjabi and Mandarin. Five distinct periods were identified of different language predominance including Spanish in spring/summer 2020, French in summer/fall 2020 and Arabic in spring 2021. Overall, these trends aligned with the language profile of health units contributing most submissions.</p><p><strong>Conclusion: </strong>Public health agencies could benefit from using existing secondary data sources to understand the language interpretation needs of their communities. This study also demonstrated how existing data sources could be used to help assess how communities are being disproportionately affected by public health emergencies and how this might change over time.</p>","PeriodicalId":94304,"journal":{"name":"Canada communicable disease report = Releve des maladies transmissibles au Canada","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11464010/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142396557","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Mathematical modelling for pandemic preparedness in Canada: Learning from COVID-19.","authors":"Nicholas H Ogden, Emily S Acheson, Kevin Brown, David Champredon, Caroline Colijn, Alan Diener, Jonathan Dushoff, David Jd Earn, Vanessa Gabriele-Rivet, Marcellin Gangbè, Steve Guillouzic, Deirdre Hennessy, Valerie Hongoh, Amy Hurford, Lisa Kanary, Michael Li, Victoria Ng, Sarah P Otto, Irena Papst, Erin E Rees, Ashleigh Tuite, Matthew R MacLeod, Carmen Lia Murall, Lisa Waddell, Rania Wasfi, Michael Wolfson","doi":"10.14745/ccdr.v50i10a03","DOIUrl":"https://doi.org/10.14745/ccdr.v50i10a03","url":null,"abstract":"<p><strong>Background: </strong>The COVID-19 pandemic underlined the need for pandemic planning but also brought into focus the use of mathematical modelling to support public health decisions. The types of models needed (compartment, agent-based, importation) are described. Best practices regarding biological realism (including the need for multidisciplinary expert advisors to modellers), model complexity, consideration of uncertainty and communications to decision-makers and the public are outlined.</p><p><strong>Methods: </strong>A narrative review was developed from the experiences of COVID-19 by members of the Public Health Agency of Canada External Modelling Network for Infectious Diseases (PHAC EMN-ID), a national community of practice on mathematical modelling of infectious diseases for public health.</p><p><strong>Results: </strong>Modelling can best support pandemic preparedness in two ways: 1) by modelling to support decisions on resource needs for likely future pandemics by estimating numbers of infections, hospitalized cases and cases needing intensive care, associated with epidemics of \"hypothetical-yet-plausible\" pandemic pathogens in Canada; and 2) by having ready-to-go modelling methods that can be readily adapted to the features of an emerging pandemic pathogen and used for long-range forecasting of the epidemic in Canada, as well as to explore scenarios to support public health decisions on the use of interventions.</p><p><strong>Conclusion: </strong>There is a need for modelling expertise within public health organizations in Canada, linked to modellers in academia in a community of practice, within which relationships built outside of times of crisis can be applied to enhance modelling during public health emergencies. Key challenges to modelling for pandemic preparedness include the availability of linked public health, hospital and genomic data in Canada.</p>","PeriodicalId":94304,"journal":{"name":"Canada communicable disease report = Releve des maladies transmissibles au Canada","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11460797/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142396556","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"An innovative tool to prioritize the assessment of investigational COVID-19 therapeutics: A pilot project.","authors":"Lizanne Béïque, Savannah Clarke, Mina Azad, Elaha Sarwar, Margaret Gale-Rowe, Stacy Sabourin, Cheryl Marinsky, Jacqueline Arthur","doi":"10.14745/ccdr.v50i10a04","DOIUrl":"https://doi.org/10.14745/ccdr.v50i10a04","url":null,"abstract":"<p><strong>Background: </strong>As the COVID-19 pandemic unfolded, hundreds of investigational COVID-19 therapeutics emerged. Maintaining situational awareness of this extensive and rapidly evolving therapeutic landscape represented an unprecedented challenge for the Public Health Agency of Canada, as it worked to promote and protect the health of Canadians. A tool to triage and prioritize the assessment of these therapeutics was needed.</p><p><strong>Methods: </strong>The objective was to develop and conduct an initial validation of a tool to identify investigational COVID-19 therapeutics for further review based on an efficient preliminary assessment, using a systematic and reliable process that would be practical to validate, implement and update. Phase 1 of this pilot project consisted of a literature search to identify existing COVID-19 therapeutic assessment prioritization tools, development of the Rapid Scoring Tool (RST) and initial validation of the tool.</p><p><strong>Results: </strong>No tools designed to rank investigational COVID-19 therapeutics for the purpose of prioritizing their assessment were identified. However, a few publications provided criteria to consider and therapeutic ranking methods, which helped shape the development of the RST. The RST included eight criteria and several descriptors (\"characteristics\"). A universal characteristic scoring scale from -10 to 10 was developed. The sum of all the characteristic scores yielded an overall benefit score for each therapeutic. The RST appropriately ranked therapeutics using a systematic, reliable and practical approach.</p><p><strong>Conclusion: </strong>Phase 1 was successfully completed. The RST presents several distinct aspects compared with other tools, including its scoring scale and method, and capacity to factor in incomplete or pending information. It is anticipated that the framework used for the RST will lend itself to use in other dynamic situations involving many interventions.</p>","PeriodicalId":94304,"journal":{"name":"Canada communicable disease report = Releve des maladies transmissibles au Canada","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11460842/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142396552","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Large scale analysis of the SARS-CoV-2 main protease reveals marginal presence of nirmatrelvir-resistant SARS-CoV-2 Omicron mutants in Ontario, Canada, December 2021-September 2023.","authors":"Venkata Duvvuri, Fatima Shire, Sandra Isabel, Thomas Braukmann, Shawn Clark, Alex Marchand-Austin, Alireza Eshaghi, Hina Bandukwala, Nobish Varghese, Ye Li, Karthikeyan Sivaraman, Hadia Hussain, Kirby Cronin, Ashleigh Sullivan, Aimin Li, Austin Zygmunt, Karam Ramotar, Julianne Kus, Maan Hasso, Antoine Corbeil, Jonathan Gubbay, Samir Patel","doi":"10.14745/ccdr.v50i10a05","DOIUrl":"10.14745/ccdr.v50i10a05","url":null,"abstract":"<p><strong>Background: </strong>In response to the COVID-19 pandemic, a new oral antiviral called nirmatrelvir-ritonavir (Paxlovid^TM) was authorized for use in Canada in January 2022. <i>In vitro</i> studies have reported mutations in M^pro protein that may be associated with the development of nirmatrelvir resistance.</p><p><strong>Objectives: </strong>To survey the prevalence, relevance and temporal patterns of M^pro mutations among SARS-CoV-2 Omicron lineages in Ontario, Canada.</p><p><strong>Methods: </strong>A total of 93,082 M^pro gene sequences from December 2021 to September 2023 were analyzed. Reported <i>in vitro</i> M^pro mutations were screened against our database using in-house data science pipelines to determine the nirmatrelvir resistance. Negative binomial regression was conducted to analyze the temporal trends in M^pro mutation counts over the study time period.</p><p><strong>Results: </strong>A declining trend was observed in non-synonymous mutations of M^pro sequences, showing a 7.9% reduction (95% CI: 6.5%-‬9.4%; <i>p</i><0.001) every 30 days. The P132H was the most prevalent mutation (higher than 95%) in all Omicron lineages. <i>In vitro</i> nirmatrelvir-resistant mutations were found in 3.12% (n=29/929) Omicron lineages with very low counts, ranging from one to 19. Only two mutations, A7T (n=19) and M82I (n=9), showed temporal presence among the BA.1.1 in 2022 and the BQ.1.2.3 in 2022, respectively.</p><p><strong>Conclusion: </strong>The observations suggest that, as of September 2023, no significant or widespread resistance to nirmatrelvir has developed among SARS-CoV-2 Omicron variants in Ontario. This study highlights the importance of creating automated monitoring systems to track the emergence of nirmatrelvir-resistant mutations within the SARS-CoV-2 virus, utilizing genomic data generated in real-time.</p>","PeriodicalId":94304,"journal":{"name":"Canada communicable disease report = Releve des maladies transmissibles au Canada","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11464099/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142396554","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Lessons learned from COVID-19: Harnessing community insights for better vaccination outcomes.","authors":"Theresa Tam","doi":"10.14745/ccdr.v50i10a01","DOIUrl":"https://doi.org/10.14745/ccdr.v50i10a01","url":null,"abstract":"","PeriodicalId":94304,"journal":{"name":"Canada communicable disease report = Releve des maladies transmissibles au Canada","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11458202/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142396555","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Evidence brief on facilitators, barriers and hesitancy of COVID-19 booster doses in Canada.","authors":"Kaitlin M Young, Tricia Corrin, Kusala Pussegoda, Austyn Baumeister, Lisa A Waddell","doi":"10.14745/ccdr.v50i10a02","DOIUrl":"https://doi.org/10.14745/ccdr.v50i10a02","url":null,"abstract":"<p><strong>Background: </strong>Understanding the facilitators, barriers and hesitancy to accepting COVID-19 booster doses is important for encouraging recommended vaccination. This evidence brief summarizes literature on the intention to accept or reject COVID-19 vaccine booster doses and the factors associated with intention/uptake among individuals in Canada.</p><p><strong>Methods: </strong>A database of COVID-19 literature established at the Public Health Agency of Canada was searched for articles referencing vaccination and knowledge, attitudes and behaviours towards COVID-19 boosters. A grey literature search of Canadian governmental and academic institutions was also conducted. Primary research conducted in Canada (n=21) and relevant systematic reviews of the global literature (n=8) were included in this evidence brief.</p><p><strong>Results: </strong>Intentions to get a booster dose in the general population have decreased between 2021-2023, with intentions varying across subpopulations. In Canada and within the global systematic reviews, facilitators, barriers and hesitancy were similar. Older age was the most common factor positively associated with intention/uptake of a booster, and the most common motivators were government/healthcare provider recommendations and helping to protect others. The main reasons for hesitancy were concerns about vaccine side effects and a lack of belief in the vaccine's efficacy.</p><p><strong>Conclusion: </strong>Intentions to get a booster dose have decreased in Canada. Understanding the reasons for vaccine hesitancy and motivators for obtaining a booster can help guide future public health COVID-19 booster vaccination programs.</p>","PeriodicalId":94304,"journal":{"name":"Canada communicable disease report = Releve des maladies transmissibles au Canada","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11460581/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142396553","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Public health contributions of entomological surveillance of West Nile virus (WNV) and other mosquito-borne arboviruses in a context of climate change.","authors":"Bouchra Bakhiyi, Alejandra Irace-Cima, Antoinette Ludwig, Miarisoa Rindra Rakotoarinia, Christian Therrien, Isabelle Dusfour, Ariane Adam-Poupart","doi":"10.14745/ccdr.v50i09a02","DOIUrl":"https://doi.org/10.14745/ccdr.v50i09a02","url":null,"abstract":"<p><strong>Background: </strong>Climate change is likely to increase the risk of human transmission of arboviruses endemic to Canada, including West Nile virus (WNV), Eastern equine encephalitis virus (EEEV) and California serogroup virus (CSV), calling for enhanced surveillance, including entomological surveillance targeting mosquito vectors. A scoping review was carried out to document the public health contributions of entomological surveillance of arboviruses of importance in Canada.</p><p><strong>Methods: </strong>The Ovid® and EBSCO platforms and the grey literature were searched to identify documents published between 2009 and 2023, in English or French, dealing with entomological surveillance of arboviruses of interest, conducted annually for human health purposes under the aegis of a government authority, with specified public health objectives and actions.</p><p><strong>Results: </strong>The 42 selected publications mainly reported two public health objectives of adult mosquito surveillance: early warning of viral circulation and assessment of the level of risk of human transmission. Recommended actions included clinical preparedness, risk communication, promotion of personal protection measures and vector control. The main objectives of immature mosquito surveillance were to identify sites with high larval densities, in order to reduce/eliminate them and target the application of larvicides.</p><p><strong>Conclusion: </strong>In a context of climate change favouring the spread of arboviruses, this study highlights the potential public health contributions of regular entomological surveillance of endemic arboviruses of importance in Canada. It helps support concrete actions to protect the health of the population from the risks of arboviral transmission.</p>","PeriodicalId":94304,"journal":{"name":"Canada communicable disease report = Releve des maladies transmissibles au Canada","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11383429/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142305441","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Human echinococcosis incidence in Canada: A retrospective descriptive study using administrative hospital and ambulatory visit data, 2000-2020.","authors":"Ayisha Khalid, Pia K Muchaal, Danielle A Julien","doi":"10.14745/ccdr.v50i09a03","DOIUrl":"https://doi.org/10.14745/ccdr.v50i09a03","url":null,"abstract":"<p><strong>Background: </strong>Echinococcosis is a zoonotic disease caused by the ingestion of tapeworm eggs shed by canids. The potential recent establishment of a more virulent European-type strain may be impacting human echinococcosis in Canada, yet information is limited.</p><p><strong>Objective: </strong>Administrative hospital and ambulatory visit data were used to provide a baseline of human echinococcosis cases in Canada between 2000-2020.</p><p><strong>Methods: </strong>Canadian Institute of Health Information's Discharge Abstract Database, Hospital Morbidity Database and National Ambulatory Care Reporting System were combined to identify cases. Risk ratios (RR) by demographic factors and cumulative incidences (CIN) over place and time were calculated.</p><p><strong>Results: </strong>A total of 806 echinococcosis cases were identified in Canada between 2000-2020, for a mean annual CIN of 1.3 cases per million population. Over the two decades, the mean annual CIN of cases increased nationally (1.3-1.4 cases per million), in the Northwest Territories (6.3-9.1 cases per million), in Alberta (1.5-2.4 cases per million) and in the Atlantic provinces (0.2-0.6 cases per million). Those from the Territories had the highest risk of echinococcosis (RR 17.1; 95% confidence interval: 8.7-33.7).</p><p><strong>Conclusion: </strong>Though explanations are multifactorial, the new European-type strain may have a role in the small absolute increase in echinococcosis CIN in Canada observed over the study period. The CIN is likely underestimated and the validity of administrative data for analyzing zoonoses warrants investigation. Though this study contributes important awareness and a baseline, improved data are needed to clarify the effects of the new strain and inform public health response.</p>","PeriodicalId":94304,"journal":{"name":"Canada communicable disease report = Releve des maladies transmissibles au Canada","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11392522/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142305439","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Prevalence and correlates of oral antibiotic use in Canada.","authors":"Glenys Smith, Anna-Louise Crago, Stephanie Alexandre, Denise Gravel-Tropper, Melissa Isada, Braden Knight, Jami Mackenzie, Jayson Shurgold","doi":"10.14745/ccdr.v50i09a04","DOIUrl":"https://doi.org/10.14745/ccdr.v50i09a04","url":null,"abstract":"<p><strong>Background: </strong>Antimicrobial use (AMU) is a known driver of antimicrobial resistance. Insight into prevalence and correlates of AMU can help identify health inequities and areas for targeted action. To better understand sociodemographic and medical dimensions of AMU in Canada, the Public Health Agency of Canada, in partnership with Statistics Canada, developed a Rapid Response Module questionnaire on self-reported oral antibiotic use, to be administered as part of the 2018 Canadian Community Health Survey (CCHS).</p><p><strong>Objective: </strong>To provide data on the proportion of people in Canada that self-report the use of antibiotics and sociodemographic and health factors associated with use.</p><p><strong>Methods: </strong>This cross-sectional study used data from the CCHS, a national survey of 24,176 people with a clustered multi-stage stratified random sampling design. In 2018, an antibiotic use module was administered to CCHS participants.</p><p><strong>Results: </strong>Among respondents 18 years and older, 26% reported receipt of at least one oral antibiotic over the past year. Several sociodemographic and health factors had higher adjusted odds of receiving an antibiotic prescription, including those aged 18 years compared to aged 48 years (mean), women compared to men, immigrants compared to non-immigrants (excluding Indigenous), current and former smokers compared to those who have never smoked, and those with comorbidities (asthma, chronic obstructive pulmonary disease, arthritis, heart disease, cancer, bowel disorder and urinary incontinence).</p><p><strong>Conclusion: </strong>Variations in AMU across different key populations and sociodemographic groups highlight the need to improve our understanding of different drivers of AMU and for tailored interventions to reduce inequitable risks of antimicrobial resistance.</p>","PeriodicalId":94304,"journal":{"name":"Canada communicable disease report = Releve des maladies transmissibles au Canada","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11389847/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142305440","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Epidemiology of sporadic and outbreak-associated hepatitis A infections in Ontario, Canada: A descriptive summary, 2015-2022.","authors":"Katherine Paphitis, Janica A Adams, Christine Navarro","doi":"10.14745/ccdr.v50i09a05","DOIUrl":"https://doi.org/10.14745/ccdr.v50i09a05","url":null,"abstract":"<p><strong>Background: </strong>Hepatitis A is a disease of public health significance that typically causes acute, self-limiting infection. Understanding the risk factors and demographics associated with individual infections and outbreaks can guide public health communication and interventions.</p><p><strong>Objective: </strong>To assess the number of hepatitis A cases and outbreaks in Ontario from January 1, 2015, to November 22, 2022, and to identify common risk factors associated with sporadic and outbreak-associated infections in Ontario.</p><p><strong>Methods: </strong>Confirmed and probable hepatitis A cases reported between January 1, 2015, and November 22, 2022, were extracted from the Ontario electronic reporting system. Descriptive analyses were used to summarize and compare risk factors reported by sporadic and outbreak-associated hepatitis A cases. Annual rates of infection for individual public health units were calculated using annual population estimates for Ontario health regions.</p><p><strong>Results: </strong>During the study period, 938 cases of hepatitis A were reported in Ontario (an average annual rate of 0.9 cases per 100,000 population), with 31.3% (n=294) of cases linked to one of 18 unique outbreaks of hepatitis A. Four of 13 local outbreaks were associated with elementary school settings. Reported risk factors differed between sporadic cases (predominantly travel-related) and cases linked to known outbreaks (anal-oral contact, illicit drug use, diapering/assisting in toileting, close contact with a case). Rates of sporadic infection differed across public health units in Ontario over the study period.</p><p><strong>Conclusion: </strong>Public health interventions that aim to increase awareness of hepatitis A risk factors and increase vaccine uptake among those at increased risk of exposure could help to reduce the incidence of both locally acquired and travel-related sporadic infections and outbreaks.</p>","PeriodicalId":94304,"journal":{"name":"Canada communicable disease report = Releve des maladies transmissibles au Canada","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11389848/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142305484","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}