people silhouette symbols concentric circles concept with covid contact tracing system |
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| navigate by keyword : airborne alert application circle concentric 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 symbol syndrome system tracing tracking viral virus |
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| People silhouette symbols in concentric circles concept with Covid-19 contact tracing system with red, orange and green alerts - Social distancing |
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