If you test positive for SARS-CoV-2 three months after your last positive test, it’s considered a reinfection. Before the omicron variant, reinfection with SARS-CoV-2 was rare but possible.
Omicron (B.1.1.529) was first reported in South Africa in November 2021 and quickly spread around the world. With many mutations, omicron was able to evade immune systems and we had more reinfections than ever before.
As the virus that causes COVID-19 continues to mutate, reinfection remains possible. Vaccination — including a booster dose — is the best protection against severe disease.