Research suggests that the FC2 female condoms are a cost-effective method of HIV prevention even at low levels of use. The data shows that the cost-effectiveness would increase significantly at higher levels of use. A study conducted in 2005 by David Holtgrave, Chair of the Department of Health, Behavior and Society at Johns Hopkins University's Bloomberg School of Public Health, examined the projected public health impact that the FC2 female condom would have at different levels of use in two developing countries: South Africa and Brazil. The study concluded that FC2 use would generate significant cost savings at all levels of implementation by preventing thousands of HIV infections and saving millions of dollars in health care costs. There is some evidence to suggest that the effectiveness of female condoms in preventing transmission of HIV may be similar to that of male condoms.