Shuvoshree (10) is fed by her mother Tapashree (20) at the International Centre for Diarrhoeal Disease Research. Her family brought her to the centre because of severe diarrhoea that they couldn't treat. The tent facility is one of five set up as a first line of defence against an outbreak of cholera, a major health threat to refugees and local people alike. A simple Rapid Diagnostic Test is used on stool samples of each patient who comes to the centre. Those which test positive for the Vibrio cholerae bacteria are sent to the capital, Dhaka, for confirmation. Most tests, like Shurushee's, return negative. Only a handful of cases have been verified and rapidly treated. In early 2018, concern over a possible cholera outbreak prompted health authorities to undertake a universal vaccination campaign which reached nearly 900,000 children and adults in Cox's Bazar district.