1984 Rajneeshee Bioterror Attack

The 1984 Rajneeshee bioterror attack was the food poisoning of 751 individuals in The Dalles, Oregon, United States, through the deliberate contamination of salad bars at ten local restaurants with salmonella. A leading group of followers of Bhagwan Shree Rajneesh (later known as Osho) had hoped to incapacitate the voting population of the city so that their own candidates would win the 1984 Wasco County elections. The incident was the first and single largest bioterrorist attack in United States history. The attack is one of only two confirmed terrorist uses of biological weapons to harm humans since 1945.

Having previously gained political control of Antelope, Oregon, Rajneesh's followers based in nearby Rajneeshpuram, Oregon, sought election to two of the three seats on the Wasco County Circuit Court that were up for election in November 1984. Fearing they would not gain enough votes, Rajneeshpuram officials decided to incapacitate voters in The Dalles, the largest population center in Wasco County. The chosen biological agent was Salmonella enterica Typhimurium, which was first delivered through glasses of water to two County Commissioners and then, on a larger scale, at salad bars and in salad dressing.

751 people contracted salmonellosis as a result of the attack; 45 of whom were hospitalized. There were no fatalities. Although an initial investigation by the Oregon Public Health Division and the Centers for Disease Control did not rule out deliberate contamination, the actual source of the contamination was only discovered a year later. On February 28, 1985, Congressman James H. Weaver gave a speech in the United States House of Representatives in which he "accused the Rajneeshees of sprinkling salmonella culture on salad bar ingredients in eight restaurants". At a press conference in September 1985, Rajneesh accused several of his followers of involvement in this and other crimes, including an aborted plan to assassinate a United States Attorney; and he asked State and Federal authorities to investigate. Oregon Attorney General David B. Frohnmayer set up an Interagency Task Force, composed of Oregon State Police and the Federal Bureau of Investigation, and executed search warrants in Rajneeshpuram. A sample of bacteria matching the contaminant that had sickened the town residents was found in a Rajneeshpuram medical laboratory. Two leading Rajneeshpuram officials were indicted and served 29 months in a minimum-security federal prison.