The process of closely monitoring those who are exposed to an infected person. It includes identifying contacts of the infected person, listing and informing those contacts of the infected person, and following up to check up on contacts’ infection and symptoms.
A direction from a more general professional, like a primary care physician, to a specialist for further action
The COVID-19 testing sites in Philadelphia want a referral from your doctor, which is why people who have symptoms are directed to call their primary care physician first. Some have a process for people without a referral, but it takes more time.
A protein produced by the immune system to recognize a foreign threat, attach to it, and begin the necessary process for neutralizing or killing it