after a check to make sure vadim has swallowed it all, he's dismissed. vadim says this program has saved his life, not just by keeping him off illegal drugs but by keeping him from contracting h.i.v./aids. the logic of this substitution therapy is simple: the more drug users on methadone, the less sharing of needles, and thus fewer transmissions of h.i.v. kostiantyn pertsovskyi is an h.i.v. prevention worker. >> it is not just about getting pill once a day, but here people get consultations from social workers and they advised them, so that it really changed their behavior to less risky one not only to themselves but to the community as a whole. >> reporter: ukraine has the highest h.i.v./aids rate in all of europe. half a million people may be infected-- more than france, germany and the united kingdom combined. diagnoses here have doubled in the last decade, as the epidemic exploded among ukraine's large injecting drug user population and their sexual partners. today, almost half new h.i.v. infections are through heterosexual contact, and the epidemic

market strategist vadim zlotnikov says the biggest worry now involves germany, europe's strongest economy. >> the big question on people's minds is, to the extent that debt of the periphery needs to be cut or written off, how will that affect german banks? will they still be able to lend? and, if you start to withdraw liquidity from the markets in the nascent stages of the recovery, you could create more problems. >> reporter: more problems might include a lack of capital in europe at a time when the global economic recovery is still fragile. experts hope at-risk european nations will implement austerity measures and make payments on their debt. nevertheless, that's still a big if. and we know how u.s. stock investors feel about uncertainty. >> if you have a very short-term time horizon, there's a lot of fear in the market, and until that fear is resolved, the market could remain very volatile and potentially decline more. >> reporter: european worries have also had a very real impact lately on the bond market. concern about the global economy has trigged a flight to safety. skittish inve