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As is common with infections, there is a delay, or incubation period, between the moment a person first becomes infected and the appearance of the first symptoms. The median delay for COVID-19 is four to five days [ 17 ] possibly being infectious on 1–4 of those days. [ 18 ]
Understanding this incubation period—the time between when a virus enters a person’s body and when they start feeling sick—is crucial for health officials. COVID-19 symptoms typically appear ...
Depending on the disease, the person may or may not be contagious during the incubation period. During latency, an infection is subclinical. With respect to viral infections, in incubation the virus is replicating. [2] This is in contrast to viral latency, a form of dormancy in which the virus does not replicate.
The degree to which the virus is infectious during the incubation period is uncertain, but research has indicated that the pharynx reaches peak viral load approximately four days after infection [61] [62] or in the first week of symptoms and declines thereafter. [63]
Here's how long it typically takes for symptoms to start.
The COVID-19 virus has not been detected in drinking water. [82] Conventional water treatment (filtration and disinfection) inactivates or removes the virus. [82] COVID-19 virus RNA is found in untreated wastewater, [82] [22] [83] [a] but there is no evidence of COVID-19 transmission through exposure to untreated wastewater or sewerage systems ...
Vyas says it’s believed that someone can be contagious for about 14 days after being exposed to someone with the virus, and symptoms can appear any time in that timeframe. ... after the CDC’s ...
After entering a host's body (which marks the beginning of the infection process), pathogens usually require time to multiply or replicate at their favorite site in the body (for example, the Hepatitis virus multiplies in the liver). After a certain time period, the pathogens become numerous enough so that the host is now able to transmit them ...