The death toll rose from 1,300 as announced two weeks ago, which put the number of suspected cases at 200,000 at the time.
The organisation said that a quarter of those killed by the disease in the war-torn country are children.
The war has destroyed Yemen’s health infrastructure and health workers have not been paid for over six months. WHO has been offering “incentives” to doctors, nurses, cleaners and paramedics to help contain the cholera outbreak.
According to Reuters, the organisation has received help from the World Bank, allowing it to set up treatment centres containing 50-60 beds, monitored by 14 medical staffs working in shifts around the clock.
Meanwhile, the war has left more than 10,000 dead since the Saudi-led coalition intervention in March 2015.