Table 3.

Relative risks for development of senile dementia in herpes zoster and HSV cases, and after anti-viral treatment.

Type of illness/infection	Relative risk
Herpes zoster ophthalmicus
Developing SD within 5 years of HZO diagnosis vs. age-matched controls.	2.97
Herpes zoster
Developing SD within 6 years of HZ diagnosis vs. age-matched controls.	1.1
Developing SD in AVT-treated HZ patients vs. untreated HZ patients	0.55
Herpes simplex types 1 and 2*
Developing SD within 10 years of HSV diagnosis vs. HSV-negative subjects.	2.564
Developing SD in AVT-treated HSV patients vs. untreated HSV patients.	0.092

*All severe cases.