Quidel Corp manufactures rapid diagnostic tests and specializes in infectious diseases, women’s health, and gastrointestinal diseases. Its products are sold to physicians, hospitals, clinical and reference laboratories, retail clinics, and pharmacies. Quidel sells a fluorescent immunoassay platform, Sofia, and a variety of molecular diagnostic assays. The majority of sales comes from the infectious disease segment, which sells tests to detect viruses that cause conditions like respiratory tract infections, herpes, Strep A, and influenza. Its second largest segment, women’s health, includes tests for pregnancy and bone health. Sales made in the United States contribute the majority of Quidel’s revenue.