The deceased is 43-year-old Phoolmati Kohar of Belkuiya village.
More than 21 people are suffering from diarrhea of whom five are critical, Rupandehi District Public Health Office (DPHO) said.
A team led by DPHO chief Maheshwar Shrestha had reached the region and started treatment immediately after being informed about the diarrheal outbreak.
Diarrhea might have spread from drinking water after some parts of the southern Marchawar region were inundated following incessant rainfall, DPHO staff said.
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