[Malaria vaccine]

Malaria affects many millions throughout the world. Though the exact number of cases is unknown, experts agree that the total is enormous and that the disease is an important factor in keeping the Third World poor and deprived. Yet efforts to attack malaria by drugs and mosquito eradication may well be failing. Most efforts to develop a vaccine have been directed at those forms of the malarial parasite that linger in the blood. But the group at New York University led by Dr. Ruth Nussenzweig has been concentrating on parasites in the form called sporozoites, which are found in the salivary glands of infected mosquitoes.