VCU Health - Influenza (Flu) and COVID-19 are both contagious respiratory illnesses, but they are caused by different viruses. As flu season and COVID-19 collide, it's important to understand their differences and
![SA Health on Twitter: "The infectious period for a common cold and flu is from about 1 day before symptoms begin and for the first 5-7 days of the illness. After 5 SA Health on Twitter: "The infectious period for a common cold and flu is from about 1 day before symptoms begin and for the first 5-7 days of the illness. After 5](https://pbs.twimg.com/media/D_pQIUiVAAAP4Ku.jpg:large)
SA Health on Twitter: "The infectious period for a common cold and flu is from about 1 day before symptoms begin and for the first 5-7 days of the illness. After 5
![Quarantine for pandemic influenza control at the borders of small island nations | BMC Infectious Diseases | Full Text Quarantine for pandemic influenza control at the borders of small island nations | BMC Infectious Diseases | Full Text](https://media.springernature.com/lw685/springer-static/image/art%3A10.1186%2F1471-2334-9-27/MediaObjects/12879_2008_Article_792_Fig2_HTML.jpg)
Quarantine for pandemic influenza control at the borders of small island nations | BMC Infectious Diseases | Full Text
![Asymptomatic transmission and high community burden of seasonal influenza in an urban and a rural community in South Africa, 2017–18 (PHIRST): a population cohort study - The Lancet Global Health Asymptomatic transmission and high community burden of seasonal influenza in an urban and a rural community in South Africa, 2017–18 (PHIRST): a population cohort study - The Lancet Global Health](https://www.thelancet.com/cms/asset/2cff28b6-64f4-44fd-a68f-f03cc8a4e6b0/gr1.jpg)
Asymptomatic transmission and high community burden of seasonal influenza in an urban and a rural community in South Africa, 2017–18 (PHIRST): a population cohort study - The Lancet Global Health
![Estimation of the incubation period of influenza A (H1N1-2009) among imported cases: addressing censoring using outbreak data at the origin of importation. | Semantic Scholar Estimation of the incubation period of influenza A (H1N1-2009) among imported cases: addressing censoring using outbreak data at the origin of importation. | Semantic Scholar](https://d3i71xaburhd42.cloudfront.net/1356b25ab5c7e9a7b8a9deb18aeb541939643cf9/5-Figure3-1.png)
Estimation of the incubation period of influenza A (H1N1-2009) among imported cases: addressing censoring using outbreak data at the origin of importation. | Semantic Scholar
Association between the Severity of Influenza A(H7N9) Virus Infections and Length of the Incubation Period | PLOS ONE
![Early efforts in modeling the incubation period of infectious diseases with an acute course of illness | Emerging Themes in Epidemiology | Full Text Early efforts in modeling the incubation period of infectious diseases with an acute course of illness | Emerging Themes in Epidemiology | Full Text](https://media.springernature.com/lw685/springer-static/image/art%3A10.1186%2F1742-7622-4-2/MediaObjects/12982_2006_Article_39_Fig1_HTML.jpg)