A cholera vaccine has proved to be safe and effective in young children in a part of India where the disease is endemic, a new study in The Lancet says.
The researchers hope the vaccine, which meets World Health Organization standards, can soon be rolled out in developing countries where cholera remains endemic.
The trial involved 107,774 participants in Kolkata, in eastern India.
"Protection was seen in children vaccinated at ages under 5 years, as well as in older individuals," wrote the researchers, led by John Clemens at the International Vaccine Research Institute in Seoul, South Korea.
Shantha Biotechnics in Hyderabad, India, manufactures the vaccine.
Cholera causes 120,000 deaths every year worldwide, according to the WHO.