Infectious disease testing involves various methods to detect pathogens, such as bacteria, viruses, or parasites, that can cause illnesses. Common tests include blood tests, swabs, and cultures, which help identify the specific infectious agent and determine the appropriate treatment. These tests are crucial for diagnosing conditions like COVID-19, HIV, and tuberculosis. Early detection can prevent the spread of diseases and improve patient outcomes. Healthcare providers often recommend testing based on symptoms, exposure history, or during routine health screenings.