Field studies demonstrated a 21.3% prevalence of Pterygodermatites coloradensis in Peromyscus leucopus and a decreasing mean worm burden during the October to April, 1977-79, study period. Decreasing worm burden may be due to fewer available infested intermediate hosts, the short life span of adult worms, or both. Forest and cave salamanders are probably not effective transfer hosts of P. color...
