From Science News:

“The war … greatly affected all service sectors such as the health sector, water supply, sanitation, electricity, transportation and roads, hygiene services and so on,” says Rowa Mohammed Assayaghi, a medical microbiologist at Yemen’s Sana’a University.

It’s possible that people are also contracting E. coli from “charity water” being brought in to help. “We found high count of E. coli” in samples of the water, she says. That one-two punch could be making the cholera outbreak more severe, says Nagi Alhaj, a microbiologist and Assayaghi’s former colleague.

Assayaghi is now traveling around Yemen teaching people how to prevent the spread of diseases. This includes teaching how to sterilize the water and recognize early symptoms, and what to do once they see a family member showing symptoms of a disease.

According to UNICEF, of Yemen’s 27.4 million residents, more than half of them lack access to clean water.