Furuya-Kanamori is an infectious disease epidemiologist.
Influenza infection manifests in a wide spectrum of severity, including symptomless pathogen carriers. Up to 80% of COVID-19 Infections Are Asymptomatic, a New Case Report Says An aerial view of people lying in social distancing circles at San Francisco's … Among the 55 studies, influenza A virus (predominantly H1N1) was the most common type of infection; 5 studies reported influenza B virus infections, and 1 study reported influenza C infections (The overall pooled prevalence for asymptomatic carriers was 19.1% (95% CI 5.2%–35.5%) for any type of influenza, 21.0% (95% CI 4.2%–41.0%) for influenza A, and 22.7% (95% CI 7.7%–39.8%) for influenza A(H1N1) (The considerable heterogeneity observed within asymptomatic and subclinical influenza prevalence could not be explained by the type/subtype of influenza, the laboratory tests used to detect the virus, the location where the study was conducted, or the year of the study. WHO Q&A: Similarities and differences – COVID-19 and influenza [17] suggest that 80% of infections are mild or asymptomatic, Iceland [18] 50% … Any discrepancies that might have affected inclusion or exclusion of a study were resolved through discussion and consensus after independent evaluation by another author (L.Y.). Most influenza infections (77%) appeared to be asymptomatic, according to the age-adjusted attributable rate of illness among infected persons of 23 illnesses per 100 person-seasons (95% CI… The multivariate regression models could only explain 16.8% and 14.8% of the observed variance for the asymptomatic and subclinical prevalence, respectively. The percentage of hospitalizations that ... are if anything even more likely to be asymptomatic. The percentage of people with asymptomatic infections is unclear. Symptoms can be mild to severe.
Laboratory confirmation of influenza was a requirement, and it had to be possible to correlate these data to the number of symptomatic patients. Search results were initially screened based on article titles and abstracts. 1002608).
assessed the risk for bias of the studies included by using a modified version of the tool developed by Hoy et al. The funders had no role in the conduct of the research.Please use the form below to submit correspondence to the authors or contact them at the following address:
For subclinical carriers, the overall pooled prevalence of was found to be 43.4% for any type of influenza, 42.8% for influenza A, and 39.8% for influenza A (H1N1).
Study results revealed an overall pooled prevalence for asymptomatic carriers of 19.1% for any type of influenza, 21.0% for influenza A, and 22.7% for influenza A (H1N1).
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As new subtypes and strains emerge, actively surveying infection status of local populations and tracking any changes in asymptomatic rates of infection should increasingly become a global health priority, possibly necessitating the provision of international resources and the deployment of dedicated rapid-response teams who are guided by standardized protocols.Mr. The 3% to 11% range is an estimate of the proportion of people who have symptomatic flu illness. independently screened the publications for eligibility in a stepwise fashion. All tests were 2-tailed, and a p value <0.05 was deemed statistically significant. 2008;167(7):775-85.
For example, the prevalence of asymptomatic influenza A(H1N1) virus ranged from 0% to 65%, resulting in an overall failure to explain the extreme heterogeneity in this reported rate. DISEASE-SPECIFIC TOPICS This number was reduced to 9,900 after removal of publications that were either duplicates or not original research papers (e.g., review papers).
Future analyses correlating asymptomatic rates with mortality rates are also required; although one could easily speculate that influenza subtypes and strains eliciting high asymptomatic rates probably incur correspondingly low mortality rates, no evidence supporting this assumption currently exists.Our study clearly demonstrates the inappropriateness of a one-size-fits-all approach to mitigating the spread of human influenza viruses.
Among infected individuals, the age-adjusted attributable rate of illness was 23 illnesses per 100 person-seasons, indicating that most influenza infections are asymptomatic. https://www.msn.com/en-us/health/medical/can-you-be-an-asymptom… Last week, an official at the World Health Organization said asymptomatic transmission of the coronavirus appears to be rare. CDC twenty four seven. According to their data, the COVID-19 infection-fatality rate is 1.46 percent, or twice as high as earlier estimates (and much higher than a misinformed rate … The overall pooled prevalence for asymptomatic carriers was 19.1% (95% CI 5.2%–35.5%) for any type of influenza, 21.0% (95% CI 4.2%–41.0%) for influenza A, and 22.7% (95% CI 7.7%–39.8%) for influenza A (H1N1) (Table 1; Technical Appendix 2 Figure 1). The prevalence of asymptomatic carriage (total absence … The ramifications of such heterogeneity can result in suboptimal intervention planning for pandemic and interpandemic influenza, which are derived from models and simulations that include arbitrary estimates of asymptomatic infection in the range of 30%–50%.Copyright© 2006-2020 Intellisphere, LLC. On This Page
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