Needed medicines are hard to find, and state-of-the-art treatment is rare: Cuba's health system, the jewel of Castro's revolution and pride of the Third World, is in grave condition. In many ways, it is still the envy of the developing world: offering free health care to all citizens as a constitutional right, Cuba has wiped out most forms of contagious disease, and it has lowered its infant-mortality rate to U.S. levels - 7.2 per 1,000 live births.