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COVID-19 coronavirus pandemic face mask social distancing public health infection outbreak quarantine lockdown travel restrictions economic impact health care PPE vaccination immunity herd immunity long-term effects new normal mask mandate vaccine passport booster shot Omicron Delta Alpha Beta Gamma mutations variants subvariants Fauci CDC WHO FDA EMA Pfizer Moderna J&J AstraZeneca Sinovac Sinopharm
Crowded city street with people wearing medical face masks during COVID-19 pandemic
Size 4301 × 2150
Format jpg
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