The Preah Vihear province research organization, ADASP, is directed by a powerful businessman and two-star general named Pen Lim.
At least 10 people have died from the disease since June.
Authorities say they are concerned infected pigs are being smuggled in from Thailand and Vietnam.
On Monday, officials began blood tests of pigs in Kampot, where the latest and most severe outbreak has occurred.
Cambodia has a widespread problem with illnesses related to diarrhea, which include infections from parasites and microbes.
The meeting was to discuss a draft law to bolster protections against pesticides and other dangerous chemicals.
Cambodia continues to struggle with its own AIDS epidemic.
Along with watery diarrhea, Cambodians are worried about cholera, with several outbreaks occurring this year.
Across Cambodia about 4,000 women work as beer promoters in hundreds of beer halls.
Diarrhea can be dangerous because it causes dehydration.
The most serious cases occurred in Ratanakkiri province, where 15 people died in just over two weeks in April.
Lawmakers and health officials from the UN are meeting Friday over the country’s progress on maternal mortality and gender equality.