The document discusses COVID-19 (coronavirus), including what it is, how it spreads, symptoms, risk factors, diagnosis, treatment, and prevention. COVID-19 is caused by the SARS-CoV-2 virus which likely originated in bats and was transmitted to humans in China in late 2019. It spreads mainly through respiratory droplets when people cough, sneeze or talk. Common symptoms include fever, cough and tiredness. Older people and those with underlying conditions are at higher risk. Diagnosis involves PCR or antibody tests. Treatment focuses on relief of symptoms and hospitalization if severe. Prevention emphasizes masks, distancing, handwashing and vaccination.