<s>[INST] I want to find out if I had COVID-19 in the past, what test could I take? [/INST] Antibody tests can tell us whether someone has had an infection in the past, even if they have not had symptoms. Also known as serological tests, these tests detect antibodies produced in response to an infection or vaccination. In most people, antibodies start to develop after days to weeks and can indicate if a person has had past infection or has been vaccinated. Antibody tests cannot be used to diagnose SARS-CoV-2 infection in the early stages of infection or disease but can indicate whether or not someone has had the disease in the past. If you have been vaccinated, many antibody tests are not able to distinguish between whether you were previously infected or have been vaccinated (or both), so in such situations you will test positive in either case. Source: WHO. Link: https://www.who.int/emergencies/diseases/novel-coronavirus-2019/question-and-answers-hub/q-a-detail/coronavirus-disease-covid-19-masks. Field: Infectious Disease. Disease: COVID </s>