crowd with people silhouette symbols concept covid contact tracing system |
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| navigate by keyword : airborne alert application concept contact contagion contagious control coronavirus covid19 crowd dangerous deadly design disease epidemic germ graphic green health illness illustration infection location medicine orange outbreak people pneumonia positive proximity quarantine red respiratory risk safe sick sickness silhouette social software symbol syndrome system tracing tracking viral virus who |
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| Crowd with people silhouette symbols concept with Covid-19 contact tracing system with red, orange and green alerts - Social distancing |
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