A disease similar to Reye's syndrome has been found to exist as an endemic disorder in Thailand. Autopsy evidence has established its occurrence since at least 1963. During a four-month period, 13 cases were found at one hospital, and evidence suggests it is common throughout the entire northeastern region of Thailand.
Olson LC, Bourgeois CH, Keschamras N, Harikul S, Sanyakorn CK, Grossman RA, Smith TJ. Encephalopathy and Fatty Degeneration of the Viscera in Thai Children. Am J Dis Child. 1970;120(1):1-2. doi:10.1001/archpedi.1970.02100060035001