ACE2 and infection: The study aims to: (i) describe the outbreaks in context of person, place, and time, (ii) visualize an infection tracing transmission network to infer the number of secondary cases per primary case and (iii) quantify the relationship between the number of potential secondary cases (outcome) and nasopharyngeal transcription of transmembrane ACE2 (exposure) while adjusting for viral RNA load, and interaction by case designation (patient or healthcare worker).