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