HIV is a retrovirus that impairs the immune system and causes AIDS. Learn about symptoms and treatment.
Coronavirus is a term describes a family of viruses, common in both animals and humans.
Long COVID refers to new or recurring symptoms that occur four or more weeks after an infection with SARS-CoV-2, the virus that causes COVID-19.
COVID-19 is the disease caused by the SARS-CoV-2, the 2019 novel coronavirus.
Vaccines activate the immune system, training it to fight off certain viral and bacterial infections.