Read UMR's July 13 Statement on NIH Funding in House Labor-HHS Appropriations Bill
NIH Research 101 | UMR Answers Common Questions About NIH Research in this New Fact Sheet Series
NIH's Role In Sustaining the U.S. Economy | 2023 Update Now Available
Why Invest in NIH Research? | UMR Offers Fact Sheets Explaining Why Congress Must #keepNIHstrong

A participant in the NIH 2019-2020 Medical Research Scholars Program.

Photo Credit: National Institutes of Health

About This Photo

COVID-19 is most transmissible 2 days before, 3 days after symptoms appear, study finds

COVID-19 is very contagious. That much isn’t up for debate. However, the exact period when infected individuals are at their most contagious has remained unclear. Now, a new study is shedding some much-needed light on the matter. Boston University researchers report COVID-19 positive individuals are at their most contagious two days before and three days after symptoms appear. Additionally, the study also finds infected individuals are more likely to be asymptomatic if they contracted the coronavirus from a primary case (the first infected person in an outbreak) who also happens to be asymptomatic.