LOS ANGELES—With the newly provided blessing of the federal government, Los Angeles County health officials began offering third doses of Pfizer and Moderna COVID-19 vaccines Aug. 14 for people with severely compromised immune systems. Among those qualifying for the booster shots are organ transplant recipients, people undergoing cancer treatment, HIV patients and people on select “immunosuppressive medications.” The Los Angeles County Public Health Department urged people to consult their doctors to confirm their eligibility for the third shot, which should be administered at least 28 days following the second dose. The third doses are being offered at vaccination sites in the county offering the Pfizer and Moderna shots. People looking for the shots will be able to simply “self-attest” that they have a qualifying medical condition. “Studies have shown immunocompromised people are more likely to have post vaccination infection and become severely ill from COVID-19,” county Public Health Director Barbara …