A nipple shield that can be modified to include a microbicide to kill the HIV virus and stop mother-to-child transmission has been invented for mothers who have trouble breast- feeding, reports Trust (The Thompson Reuters Foundation). About 400,000 children contract HIV worldwide each year, and nearly all acquire the virus from their mothers. The risk of transmission is significantly increased through breast feeding. However, the only way to lower the risk is to formula feed, which is usually unsafe, expensive and impractical, especially in developing countries, where formula-fed babies then face a higher risk of malnutrition, diarrhea and other infections. The shield, called JustMilk, would allow women to breast-feed without passing along the virus.