Thailand, Belarus and Armenia have eliminated mother-to-child transmission of HIV, according to the World Health Organization (WHO). As The Associated Press reports, last year Cuba became the first country to attain that goal.

In Thailand, thanks to strong prenatal care programs, the number of babies born with HIV dropped from more than 3,000 in the late 1990s to 86 in 2015. This meets WHO’s criteria for elimination: a mother-to-child transmission rate of less than 2 percent and fewer than 50 new infections per 100,000 births.

And yet experts warn that HIV remains a problem in Thailand. About 450,000 people are estimated to be living with the virus, out of a population of 60 million, and rates of new HIV cases are increasing among gay men and transgender people.

Thailand also eliminated mother-to-child transmission of syphilis.