Hospitals in the city, which is controlled by Ansarullah, are crowded with cholera patients.
The Red Cross says the number of suspected cases in the country has tripled in a week to more than 8,500.
Yemen has been ravaged by hunger and the saudi-led war against the country, allowing disease to spread rapidly.
Two-thirds of the population do not have access to safe drinking water, according to the UN.
Dominik Stillhart, director of operations at the International Committee of the Red Cross, told a news conference in Sanaa on Sunday that there had been 115 deaths from cholera nationwide from 27 April - 13 May. "We now are facing a serious outbreak," he said.
Saudi Arabia and its allies (the Saudi-led Coalition) have launched a military operation against Yemen since 25 March 2015 titled "Decisive Storm" in order to return the saudi-backed former president ’Abdrabbuh Mansur Hadi’, by force, to power after his mandate expired in January 2015.