HUCU.AI
HUCU.AI is a free HIPAA compliant messaging network (like Slack for healthcare) with flags for Covid PUI, COVID +ive, COVID-ive, and others.
Rankings by 
Национальный рейтинг
535th
in United StatesРегиональный рейтинг
617th
in North America and CaribbeanГлобальный рейтинг
1601st
worldwide