covid young woman wearing surgical mask using smart phone app city street |
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| navigate by keyword : air app application cars city contact corona coronavirus covid19 crisis diagnostic distancing economic epidemic flu girl global infected infection influenza mask mobile outdoor pandemic particulate people person phone pollution protection protective quarantine respiratory sarscov2 self smart social software spring street surgical tracing traffic urban virus walking warming woman young asymptomatic curfew herd immunity high alert immune increase cases isolated lockdown negative outbreak positive safe safely second wave shutdown spreads state calamity symptomatic symptoms vaccine |
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| COVID-19 Young Woman Wearing Surgical Mask Using Smart Phone App in City Street to Aid Contact Tracing in Response to the Coronavirus Pandemic |
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