Investigation and OutcomesOn January 21, CDC launched a multistate investigation in collaboration with the Georgia Department of Public Health, Texas Department of State Health Services, and Washington State Department of Health to identify and characterize cases.This activity was reviewed by CDC, deemed not research, and was conducted consistent with applicable federal law and CDC policy.*Thirteen family members traveled to Arenal and Manuel Antonio, Costa Rica, during December 21-28, 2024.Investigation revealed that 12 of the 13 family members toured Venado Caves, a popular tourist location, on December 24 (day 0).All reported seeing bats and having direct contact with bat droppings while crawling and squeezing through tight spaces in the cave.All 12 persons became mildly or moderately ill after returning to the United States, 8-19 days after exposure.
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Ghai et al. (2025) studied this question.
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