Norovirus sickens dozens on PCT Wrightwood

Dozens of Pacific Crest Trail hikers near Wrightwood, California have reported severe gastrointestinal illness in an apparent norovirus outbreak that surfaced publicly on May 20, according to media reports citing hikers and local officials. A shared water cache in the Swarthout Valley area between Cajon Pass and Mount Baden-Powell has emerged as a suspected common exposure point, though officials had not confirmed a source. At least one hiker was airlifted after falling ill, and a nearby camp closed its doors to hikers through May 24 while the situation was monitored. ### Where on the trail are hikers getting sick? Wrightwood, a mountain community along a well-traveled Southern California section of the Pacific Crest Trail, is the center of the reports. Newsweek said the illnesses were tied to hikers moving through the area, and follow-up coverage described the suspected exposure zone as a shared cache in Swarthout Valley. The Pacific Crest Trail Association identifies Wrightwood as part of the Southern California corridor used by thru-hikers moving north in spring. (newsweek.com) May is a busy period on that stretch because northbound hikers are moving out of the desert section and into the San Gabriel and San Bernardino ranges. That pattern can put many hikers in contact with the same trail angels, caches, camp areas and rest stops over a short period. The current reports have focused on those shared touchpoints rather than on a confirmed food vendor or municipal water system. (newsweek.com) ### What has actually been confirmed so far? San Bernardino County Department of Public Health spokesperson Francis Delapaz told SFGATE the department was aware of one case reported on May 18, but said it did not yet have evidence of a confirmed increase or cluster of norovirus cases in the Wrightwood area beyond what would normally be expected. That leaves a gap between the number of hikers describing illness and the number of cases formally reflected in county reporting. (newsweek.com) Ron Hals, a 73-year-old retiree from Fort Bragg, was identified in Yahoo’s repost of SFGATE’s report as one of the sick hikers. Yahoo said Hals was diagnosed with norovirus after becoming violently ill and was flown to Lancaster before being released. ### Why are officials and hikers focusing on a water cache? Newsweek reported that early signs pointed to a shared water cache as a possible source of contamination, but said the exact source had not been confirmed. (europesays.com) Yahoo’s follow-up similarly said sick hikers had been seen near a shared cache the week before the outbreak reports surfaced. (yahoo.com) California public health guidance says norovirus spreads through the fecal-oral route, including contaminated food, drinks, surfaces and objects, and that only a small infectious dose is needed. The California Department of Public Health also says shedding in stool peaks in the first 24 to 48 hours after symptoms begin and can continue for weeks, which helps explain why shared containers, spigots, tables and toilets are a concern in trail settings. (newsweek.com) ### How serious is norovirus in a backcountry setting? The California Department of Public Health says norovirus commonly causes vomiting, diarrhea and nausea and is one of the leading causes of gastroenteritis in the United States. In a backcountry corridor, those symptoms can quickly become a dehydration problem because hikers may be far from medical care and already under physical stress. (cdph.ca.gov) The CDC said on April 29 that 1,092 norovirus outbreaks had been reported by NoroSTAT-participating states between Aug. 1, 2025 and April 9, 2026. CDC data also said the 2025-2026 seasonal year remained within the middle 50% of prior seasons, indicating the Wrightwood reports are notable because of the trail setting, not because federal data show an unusual national surge. (cdph.ca.gov) ### What happens next for hikers on that section? Angeles Crest Christian Camp said, through the Yahoo-republished report, that it had closed to hikers until May 24 while officials monitored the outbreak. California guidance says suspected outbreaks of acute gastroenteritis must be reported immediately by telephone to the local health department, even though individual norovirus cases are not reportable statewide. (cdc.gov) The Pacific Crest Trail Association’s trail conditions page remains one place hikers can check for updates from the corridor, while San Bernardino County public health would handle any local outbreak response. As of May 21, officials had not publicly confirmed a single source for the illnesses. (pcta.org) (yahoo.com)