Vaccine advance: monkeys still infected, but protected from illness

All monkeys given a new vaccine were protected against illness from an AIDS-like virus; they did become infected, but maintained healthy immune responses and did not become sick. Half of the unvaccinated monkeys in the comparison group had died of the infection by day 140. This is the best vaccine result so far, a proof of principle showing what can be done, but the vaccine is not ready for human use.