Around the world, more than 300,000 babies contract the virus from their mothers each year. Dr. Jonathan jacobs is an aids specialist. This is very encouraging, everything thats happened so far. But this person has to be followed for a lot longer to really know what the true effect of this early treatment was. Reporter prevention of h. I. V. In newborns rather than treatment is by far the best strategy. In the United States, routine h. I. V. Screening and treatment of the mother during pregnancy has dramatically lowered the number of babies born with the virus to fewer than 200 each year. Pelley jon, does this tell us anything about the treatment for adults . Are there any implications here . Reporter scott, i want to emphasize it doesnt yet tell us everything about babies. This is a oneperson test. But for adults, one possibility is if somebody is exposed to h. I. V. , say, through a needle stick theres whats called a window of opportunity. We know if you treat that person with antire