Acute diarrhea outbreaks have occurred in 10 northern localities, with Hanoi being the hardest-hit area, a local health agency reported.
Preventive Health Department Head Nguyen Huy Nga said on Wednesday that 85 patients had tested positive for cholera, with 44 cases reported in Hanoi alone.
Tran Thi Phuong Thuy, a doctor from the Hanoi-based National Institute for Tropical and Infectious Diseases, said 103 patients with acute diarrhea are currently being treated on site.
Three other Hanoi general hospitals – Xanh Pon, Bach Mai and Dong Da – also admitted a total of 110 cases of acute diarrhea.
Recent tests conducted by the institute revealed the presence of the bacterium Vibrio cholerae, which causes the cholera disease, in water from canals and lakes in Hanoi and other northern provinces.
Warmer temperatures associated with the changing of the season heighten the bacterium resistance and increase the potential for the disease to proliferate.
Nga said water sterilization measures have been implemented at infected canals and lakes.
Last December, the Ministry of Health announced a 40-day acute diarrhea epidemic in 13 northern localities had been controlled.
That outbreak totaled 1,991 reported cases, of which 295 tested positive for cholera.