These people are the ulitmate hippies. In 1987 at a gathering of thousands in a National Forest in Western NC, many of them got sick from giardia from drinking unclean spring water. As a result, they were crapping all over the place and stepping in each others diaherria resulting in dysentery:
A serious public health threat arose at the 1987 Gathering. At the site of this Gathering, many Rainbow Family members did not boil water from springs that were high in fecal coliform bacteria. During the week of July 1-4, many people had diarrhea and fever. As people at the Gathering became sick, they used the latrines less and less. Uncovered human wastes were scattered where people traveled and camped. Many people went barefoot and their stepping in uncovered human wastes helped transmit the disease. Hospitals in two states notified the Centers for Disease Control (CDC, now called the Centers for Disease Control and Prevention) in Atlanta that cases of confirmed shigellosis had been detected among people who had attended the Gathering. Shigellosis is a highly contagious form of dysentery, caused by shigellae bacteria. The disease is transmitted by direct or indirect fecal-oral contact from one person to another or by contaminated food or water. Individuals primarily responsible are those who fail to clean adequately their fecally contaminated hands. Transmission by water, milk, or flies may occur as a result of direct fecal contamination. One need ingest only a small number of organisms to contract the disease, and symptoms normally appear within seven days.
Two CDC doctors visited the site of the Gathering the week after July 4 and interviewed a large percentage of the Rainbow Family members remaining at the site. The doctors estimated that 65 percent of those people had shigellosis. At the doctors' suggestion, the Forest Service closed the site to other members of the public from July 15 to 29 for health reasons. By the middle of August, 25 states reported outbreaks of shigellosis traced to people who had attended the Gathering. In early October, cases of the disease were still being reported in 25 states.