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What does Tianhe CDC mean by sending me a text message?

This means that you may have been exposed to cases or asymptomatic infections in COVID-19, or you may have been exposed to the environment or objects polluted by COVID-19. Received a warm reminder from the Short Center for Disease Control and Prevention, which is a message sent through big data screening. Big data shows that you may have been exposed to cases or asymptomatic infections in COVID-19, or you may have been exposed to the environment or articles polluted by COVID-19.