Short answer
Testing, isolation, quarantine, and monitoring decisions are public-health and clinical actions. CDC HAN guidance says clinicians should coordinate with state or local health departments for suspected cases and that repeat testing can be needed early in illness.
For exposed people
People contacted by public-health officials should follow those instructions. This site does not provide individual testing or quarantine determinations.
Frequently asked questions
Can contacts be routinely tested?
WHO DON601 says current evidence does not support routine laboratory testing of contacts for outbreak control.
Who handles testing questions?
CDC HAN directs questions about specimens through state or local health departments or CDC's Emergency Operations Center.
Primary sources reviewed
CDC, WHO, and ECDC official public-health pages were reviewed for this build. Current outbreak counts use official outbreak updates; evergreen pages use official background and guidance pages.