Malaria parasites leave a trail of destruction in an infected person's body. The microscopic invaders massacre red blood cells, produce harmful chemicals, and sometimes damage the brain. A new mouse study suggests that the parasites can also weaken bones. If they do the same in people, they could stunt the growth of children infected with the disease. But the study also provides some good news, identifying a potential way to prevent the skeletal decline with a compound similar to vitamin D. "It's important work," says parasitologist Regina Joice Cordy of Emory University in Atlanta, who wasn't connected to the study. It has taken us a step further, she adds, in understanding the long-term effects of malaria infections.

Malaria parasites are microorganisms that belong to the genus Plasmodium. There are more than 100 species of Plasmodium, which can infect many animal species such as reptiles, birds, and various mammals. Four species of Plasmodium have long been recognized to infect humans in nature.

Malaria parasites, which are transmitted in the bite of an infected mosquito, cause the most destruction during the part of their life cycle when they dwell in red blood cells circulating through the body. There, they reproduce and feast on oxygen-carrying hemoglobin proteins, after releasing the blood cells, killing them in droves. After researchers have also detected the parasites in bone marrow, where blood-forming stem cells reside, no one has known until now whether they damage the skeleton.