The WHO’s director general, Margaret Chan, said it was “one of the greatest public health achievements possible” and an important step towards an Aids-free generation.
HIV and syphilis testing for pregnant women and their partners, caesarean deliveries and substitution of breastfeeding have also contributed to the breaking of the infection chain, said the WHO.
It is estimated that each year 1.4 million women living with HIV become pregnant. Untreated they have a 15-45% chance of transmitting the virus during pregnancy, labour or breastfeeding. The risk drops to just over 1% if the mother and baby are treated with antiretrovirals.
Globally, more than 35 million adults and children are living with HIV but the infection rate has slowed significantly, with 2.1 million becoming HIV positive in 2013, down from 2.9 million in 2005, according to UNAids data.
Scientists have said eradicating Aids is feasible if HIV prevention continues to grow, even if there is no cure. The reduction in infection rates in Cuba is seen as a major breakthrough in the campaign to rid the world of the virus.
Incidence of syphilis transmission is close behind with 1 million pregnant woman worldwide infected. This can be eliminated with simple treatments such as penicillin during pregnancy.
In 2013, only two babies were born with HIV in Cuba, and only five born with congenital syphilis. According to the WHO, the number of children born every year with HIV has almost halved since 2009, to 240,000 in 2013.