The Morbidity and Mortality Weekly Report of the Centers for Disease Control and Prevention reports that five people in Los Angeles, California, have a rare form of pneumonia seen only in patients with weakened immune systems, in what turns out to be the first recognized cases of AIDS.

The Morbidity and Mortality Weekly Report (MMWR) is a series of epidemiological science periodicals published by the United States Centers for Disease Control and Prevention (CDC). The MMWR series comprises 4 publications: the Weekly Report, published weekly on Thursdays, and 3 titles presenting…