When does the infectious period for spreading SARS-CoV-2 generally begin relative to symptom start?
Answer
One to two days before symptoms start
A key epidemiological challenge in managing COVID-19 transmission is that infectivity precedes clinical presentation. The infectious period, the time an infected person can spread the SARS-CoV-2 virus, typically initiates one to two days prior to the onset of any noticeable symptoms. Although peak viral shedding often aligns closely with the beginning of symptoms or slightly afterward, this pre-symptomatic transmissibility during the tail end of the incubation period necessitates proactive measures like early testing or masking upon known exposure.
Related Questions
What defines the COVID-19 incubation period between exposure and symptom onset?What percentage of people develop COVID-19 symptoms within 11.5 days of exposure?When does the infectious period for spreading SARS-CoV-2 generally begin relative to symptom start?When was the initial identification of COVID-19 cases in Wuhan, China, marking the pandemic start?Which factor influences the exact timing of COVID-19 symptom onset for an individual?For mild to moderate COVID-19 cases, how long do active symptoms typically resolve within?If isolation for COVID-19 is ended early (e.g., after five days), what subsequent action is usually required?What symptom became a distinguishing hallmark early in the COVID-19 pandemic?What is the median incubation period for COVID-19 often cited as?What does personalized pacing in the recovery period respect regarding the body's needs?