Researchers announced this week that a baby infected with HIV, or human immunodeficiency virus, is currently testing negative for the virus after aggressive drug treatments. The infant, born in Long Beach, California, in 2013, is the second such baby reportedly cured of the disease.

Both infants, one born in Mississippi in 2010 and the California baby, got HIV from their mothers, who were infected. Pediatricians attending the births decided to treat the newborns with a trio of drugs—as opposed to just two drugs—and at stronger than usual concentrations.

The early, aggressive treatments seem to have worked in both cases. The Mississippi baby—who stopped receiving treatment after 18 months—is now more than three years old, and tests have found