Early in the pandemic, the message from governments of all levels was crystal clear: If you have symptoms, get a PCR test. While that still largely holds true, rules about who should get tested and ...

A polymerase chain reaction (PCR) test detects genetic material from a pathogen or abnormal cell sample. Ways of collecting samples include a nasal swab, a saliva swab, or taking a sample of blood.

You have reached your maximum number of saved items. Remove items from your saved list to add more. Many countries, as well as airlines, require travellers to show a negative PCR COVID-19 test in ...