<prompt> Answer this question truthfullyWhat are serum and urine rapid antigen tests, and what can they be used to detect?  <response>: <reason> Serum and urine rapid antigen tests are diagnostic tests that can quickly detect the presence of certain antigens in the blood or urine. These tests can be used to detect a variety of infections, including Histoplasma. Histoplasma is a type of fungus that can cause respiratory and systemic infections, particularly in individuals with weakened immune systems. Rapid antigen tests can be a useful tool in diagnosing and treating these types of infections. 