Two Tampa Bay area residents received devastating news Wednesday when they learned they had contracted the human immunodeficiency virus (HIV) from a blood transfusion. The two unidentified patients received the tainted transfusions during surgery in mid-March. According to Florida Blood Services, which supplies 180,000 pints of blood a year to 30 Hillsborough, Pinellas and Pasco county hospitals, the transfusions originated from the same donor.

Experts say the chance of acquiring HIV from a blood transfusion is around one in 2 million. The incident marks the second time in the past year, though, that a healthy patient has contracted HIV from a blood transfusion. A San Antonio, Texas man was infected in September.