Full article at http://neurosciencenews.com/apoe4-parasitic-disease-5910/
Trumble and colleagues examined cognitive performance and parasite exposure data from a remote population of forager-horticulturalists in the Bolivian Amazon, called the Tsimane. The Tsimane experience high parasite loads, making them a suitable population for study for the role of the E4 allele in this circumstance. The researchers undertook a genetic analysis, measured immune markers of parasitic infection, and conducted cognitive tests on 372 Tsimane men and women aged 6 to 88 years.
The research is in The FASEB Journal. (full access paywall)