![]() ![]() For Delta, the viral load is up to roughly 1,200 times higher than the original strain. But there is often a gap between when a person becomes infectious to others to when they show symptoms.Īs the virus replicates, the viral load increases. ![]() The time from virus exposure to symptoms is called the incubation period. People with COVID-19 appear to be most infectious two days before to three days after symptoms start, though it’s unclear whether this differs with Delta. Although often there are no symptoms yet, the person has become infectious.
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