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Source: CDPH Guidance for Local Health Jurisdictions on Isolation of the General Public
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If you do not have symptoms, and are at higher risk of severe COVID-19 infection and would benefit from treatment, you should test within 5 days.

If you do not have symptoms and have contact with people who are at higher risk for severe infection, you should mask indoors when around such people for 10 days. Consider testing within 5 days after the last exposure date (Day 0) and before contact with higher-risk people. For further details, see CDPH COVID-1​9 tes​​ting guidance​.​
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Asymptomatic
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Close Contact*
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SymptomaticIf you have new COVID-19 symptoms, you should test and mask right away.
Note that you may need to test repeatedly with home antigen tests, as they are not sensitive enough to confirm all positive cases in the early stages of the infection
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*DEFINITIONS & NOTES
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Close contact = individual(s) who spent more than a cumulative total of 15 minutes (within a 24-hour time period) in a shared indoor airspace (e.g., classroom or office) with someone with COVID-19 during their infectious period
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Day 0 = date of last close contact
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Vaccination status no longer a factor in determining actions to take
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"Up to date" = vaccinated and, IF ELIGIBLE, boosted
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