Abstract
Data are presented on the life span and pathology of 15 inbred and 2 outbred strains of mice, and 1 inbred and 1 outbred strain of rats, maintained under specified-pathogen-free (SPF) conditions. Among the mice, longevity ranged from 312 to 802 days. Survival curves for each strain are given. Neoplasia was the most common pathological finding.