Is secondary spread with human norovirus common within 1 to 2 weeks after initial infection?

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Multiple Choice

Is secondary spread with human norovirus common within 1 to 2 weeks after initial infection?

Explanation:
Secondary spread is common within 1–2 weeks after initial norovirus infection. Norovirus is highly contagious, and people continue to shed virus in stool (and sometimes vomit) for about a week or two after symptoms start, with shedding sometimes persisting even after recovery. Because only a small amount of virus is needed to cause illness, this ongoing shedding readily leads to new cases in close-contact settings. The virus’s stability in the environment and its fecal–oral transmission route further enable secondary transmission, especially in outbreaks. So, within that 1–2 week window, secondary spread happens frequently.

Secondary spread is common within 1–2 weeks after initial norovirus infection. Norovirus is highly contagious, and people continue to shed virus in stool (and sometimes vomit) for about a week or two after symptoms start, with shedding sometimes persisting even after recovery. Because only a small amount of virus is needed to cause illness, this ongoing shedding readily leads to new cases in close-contact settings. The virus’s stability in the environment and its fecal–oral transmission route further enable secondary transmission, especially in outbreaks. So, within that 1–2 week window, secondary spread happens frequently.

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