Men have double the risk of catching HIV if their partner is pregnant

A study of more than 3,000 couples in Africa also backed previous research showing women are more susceptible to HIV infection when they are pregnant. The researchers speculate that changes in a pregnant woman's immune system may contribute to the increased chance of her partner becoming infected. Young women of reproductive age are among those at greatest risk of HIV infection in countries with high levels of disease. The study was carried out in Botswana, Kenya, Rwanda, South Africa, Tanzania, Uganda and Zambia.