The Rajneeshee Case — 1984 Salmonella Bioterror Attack in Oregon

The Case

The Rajneeshee case is the first large-scale bioterror attack on U.S. soil in modern history — a deliberate 1984 mass poisoning carried out by followers of the Indian guru Bhagwan Shree Rajneesh (later known as Osho) in The Dalles, Wasco County, Oregon. Members of the Rajneeshpuram commune cultured Salmonella typhimurium in their own medical laboratory and contaminated salad bars and food at ten restaurants in an attempt to incapacitate local voters ahead of the 1984 Wasco County elections. The outbreak sickened 751 people and hospitalized 45.

The Crime

In 1984, leaders at Rajneeshpuram — a sprawling commune established by followers of Bhagwan Shree Rajneesh in rural Oregon — feared they would lose political control of Wasco County. To tilt the election, members of the group developed a plan to suppress voter turnout in The Dalles by making large numbers of residents too ill to vote.

Followers secretly purchased bacterial cultures and grew Salmonella typhimurium at the commune's medical clinic. According to the 1986 U.S. Attorney General report, the cult tested its methods on August 29, 1984, by giving local officials contaminated water samples during a visit to the ranch. In the weeks that followed, members spread the bacteria onto salad bars, salad dressings and coffee creamers at ten restaurants across The Dalles.

Beyond the salmonella attack, investigators later uncovered an aborted plot to murder Charles Turner, a former U.S. Attorney for Oregon who was investigating the commune.

The Victims

The 751 victims were ordinary residents and visitors who ate at restaurants in The Dalles in the autumn of 1984. Forty-five people were hospitalized with severe gastrointestinal illness, and although no deaths were recorded, several victims — including infants and elderly people — were critically ill. The provided sources do not name individual victims of the salmonella outbreak, but the case is widely regarded as the largest bioterror incident in U.S. history measured by number sickened.

The broader victim group also includes the residents of Wasco County, whose democratic process the cult attempted to subvert, and former Rajneeshee members who were intimidated within the commune.

Investigation

Initially, Oregon public health officials treated the outbreak as an unusual but conventional foodborne event. Suspicions only escalated in 1985, when investigators began noting that the commune's leadership had publicly threatened political opponents and that several former members described internal poisoning plots.

The FBI and Oregon authorities raided Rajneeshpuram and discovered open vials and laboratory paraphernalia at the commune's medical clinic. A pivotal moment came when the CDC compared the strain recovered from the clinic with the strain that had sickened diners: the laboratory analysis confirmed an exact genetic match, tying Rajneeshpuram conclusively to the attack.

A federal grand jury in Oregon ultimately named 21 defendants in a related wiretapping indictment, while Ma Anand Sheela — Rajneesh's personal secretary and the commune's de facto operations director — and licensed nurse practitioner Dianne Onang were charged in the product-tampering case. The investigation was documented in detail in a Department of Defense historical review of biological incidents.

Trial and Verdict

Ma Anand Sheela and Dianne Onang were convicted of product tampering for their roles in the salmonella poisoning. Sheela, identified at birth as Shila Ambala Patel, was the chief organizer of the attack and the operational head of Rajneeshpuram during the relevant period. Bhagwan Shree Rajneesh himself was not convicted in the salmonella case based on the available sources, though he was central to the commune and was eventually deported from the United States on separate immigration-related charges.

The convictions established a legal and historical precedent: the Rajneeshee attack was officially classified as bioterrorism, and the case became a foundational reference for U.S. biodefense policy.

Today

The Rajneeshee bioterror attack remains a benchmark case in the study of domestic terrorism, cults and public health emergency response. It returned to mainstream attention with the 2018 Netflix documentary Wild Wild Country, which examined the rise and fall of Rajneeshpuram, and is regularly cited in academic literature on biosecurity and food safety. The site of the former commune is now a Christian youth camp, and The Dalles has largely moved on — but the 1984 attack continues to serve as a sobering reminder that bioterrorism can originate from within a community as easily as from abroad.