In Lesotho, a Southern African country the size of Maryland, health workers on horseback are transporting blood tests, drugs and medical supplies between 
urban hospitals and rural mountain health clinics. More than four months of the year, bad weather washes out the roads, making them impassable by vehicle, so Horse Riding for Health, started by the United States Agency for International 
Development and the Elizabeth Glaser Pediatric AIDS Foundation, allows patients to be treated year-round. One in four adults in Lesotho is living with HIV.