Several drugs companies have announced big cuts to the amounts they charge for their vaccines in the developing world.
GlaxoSmithKline, Merck, Johnson & Johnson and Sanofi-Aventis have agreed to cut prices through GAVI, an international vaccine alliance.
GSK said it would cut the price of its vaccine for rotavirus by 67% to $US2.50 per dose in poor countries.
Rotavirus-related diarrhoea kills more than 500,000 children per year.
The BBC reports the vaccine will be subsidised by higher prices being charged in richer countries.
The rotavirus vaccine, for example, would cost about $US50 in the United States.