Chickenpox is associated with a 47% lower risk of glioma (brain tumors) among people younger than 40, and among people of all ages - by 21%.Does not infection with varicella-zoster virus affect risk of adult glioma? 1997, Wrensch, Am J Epidemiol
Chickenpox is associated with a 60% reduced risk of glioma and herpes zoster by 50%.Prevalence of antibodies to four herpesviruses among adults with glioma and controls. 2001, Wrensch, Am J Epidemiol
Those who had the flu and ARVI, the risk of glioma (brain tumors) and meningioma (tumors of the meninges) was 27-28% lower.