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.

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 ...

With the volatile changes in travel rules and regulations due to Covid-19, it can be difficult to keep up with the latest information. If you are travelling, it’s important to know what you'll need ...