Varicella is associated with a 47% decrease in the risk of glioma (brain tumor) among people under the age of 40 years, and a 21% for people of all ages.Does not infection with varicella-zoster virus affect risk of adult glioma? 1997, Wrensch, Am J Epidemiol
Varicella is associated with a 60% decrease in the risk of glioma, and herpes zoster with a 50% decrease..Prevalence of antibodies to four herpesviruses among adults with glioma and controls. 2001, Wrensch, Am J Epidemiol
Subjects who reported a history of infectious diseases (e.g., colds, flu) showed a 30% reduction in risk of glioma (brain tumor) development.