But the WHO said that vaccine stockpiles were extremely low -- and that manufacturers were not enthusiastic about producing a vaccine chiefly aimed at some of the poorest countries in the world."If we don't control the outbreak now, the situation will get worse and worse," Philippe Barboza, the WHO's team lead on cholera, told reporters in Geneva.Vaccine shortage"But this year, we have a factor which is even more important: the direct impact of climate change, with a succession of major droughts, unprecedented floods in certain parts of the world, and cyclones which have amplified most of these epidemics," he said.Although cholera can kill within hours, it can be treated with simple oral rehydration, and antibiotics for more severe cases."It is not acceptable in the 21st century to have people dying of a disease which is very well-known and very easy to treat," said Barboza."