epidemic threshold man medical lab protective mask open palm stop gesture danger zone virus |
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| navigate by keyword : epidemic man infection protective virus stop pandemic medicine medical syndrome mask open palm gesture danger zone concept critical number density susceptible hosts threshold lab analysis antibiotic bacteria caution coronavirus diagnosis disease doctor fever flu health hematology hospital ill illness infectious nurse outbreak pneumonia quarantine respiratory risk vaccine |
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| Epidemic threshold. Man in medical lab. Protective mask. Open palm stop gesture. Danger zone. Stop epidemic. Virus concept. Epidemic infection. Critical number or density of susceptible hosts. |
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