Puerto Vallarta, Jalisco, August 5, 2026 – Jalisco has confirmed its first two cases of cyclosporiasis, but health officials say both infections were acquired outside Mexico and there is no evidence of local transmission.
The cases involve two women who recently traveled to the United States and Canada and developed symptoms after arriving in Jalisco. Laboratory testing confirmed the infections, according to a report on the state confirmation.
One woman received treatment through the public health system and the other through a private facility. Both have recovered, while health officials continue medical follow-up. One patient is a foreign national, state officials said.
Roberto Rivera Ávila, director of Public Health for the Jalisco Health Secretariat, said neither patient had transmitted the infection to household contacts. One woman lived alone, while the other had three close contacts who did not become ill.
The confirmation comes as U.S. and Canadian health agencies investigate a broader Cyclospora outbreak. The U.S. Centers for Disease Control and Prevention currently lists a multistate outbreak linked to iceberg lettuce, although the investigation into the source remains active.
Mexico’s federal health authorities have also been involved in the cross-border investigation. On July 23, the Health Secretariat reported that laboratory testing found no Cyclospora in 10 lettuce samples from Taylor Farms facilities in Mexico. The results did not establish the source of the Jalisco infections, and officials have not linked either patient to Mexican-grown produce. The federal testing notice is available here.
Cyclosporiasis is caused by the microscopic parasite Cyclospora cayetanensis. It spreads when people consume food or water contaminated with the parasite. Direct person-to-person transmission is considered unlikely because the parasite must remain outside the body for one to two weeks before becoming infectious.
The most common symptoms include frequent watery diarrhea, abdominal cramps, and fatigue. Symptoms may improve and return, and untreated infections can last for several weeks. Diagnosis requires a stool test that specifically screens for Cyclospora, as it may not be included in routine testing.
People who develop persistent watery diarrhea after recent travel should tell a health professional where they have been and ask whether Cyclospora testing is appropriate. Severe diarrhea can also cause dehydration, especially among older adults, children, and people with weakened immune systems.
The two Jalisco cases reportedly bring Mexico’s national total to five. The public reports did not identify Puerto Vallarta as the location of either case and did not announce any local health warning for the city.
PVDN previously reported on Mexico’s testing during the U.S. outbreak in Mexico Finds No Cyclospora as U.S. Cases Near 2,000. Additional local health coverage is available through the Puerto Vallarta healthcare news section.
