In a written statement issued on Tuesday, the WHO said the camps -- which it called the world’s biggest refugee settlement areas -- were risking disease outbreaks.
Urging further efforts in health services for nearly 1.3 million people in Cox’s Bazar -- Rohingyas and their surrounding host communities -- the WHO said health needs continued to be immense.
According to the regional director for WHO South-East Asia, Poonam Khetrapal Singh, cited in the statement, major efforts had been made by the Bangladeshi government and partner agencies to prevent the spread of diseases such as cholera and to rapidly control outbreaks of measles and diphtheria.
"However, the challenges are huge, multiple and evolving. The magnitude of the crisis requires continued efforts and generous contributions by all partners to scale up health services for the vulnerable population," she said.
The regional director said "water and sanitation, and shelter continue to be far from optimum, increasing the risk of rapid spread of several communicable and water borne diseases."
The Rohingya, described by the UN as the world's most persecuted people, have faced heightened fears of attack since dozens were killed in communal violence in 2012.
At least 9,000 Rohingya were killed in Rakhine state from Aug. 25 to Sept. 24, according to Doctors Without Borders.
The UN has documented mass gang rapes, killings -- including of infants and young children -- brutal beatings and disappearances committed by security personnel. In a report, UN investigators said such violations may have constituted crimes against humanity.APP/AFP