Incidence of Infection and Host Specificity of Cuterebra tenebrosa in Bushy-Tailed Wood Rats (Neotoma cinerea) from Central Washington

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Abstract
C. tenebrosa Coquillett bot flies were studied under natural and laboratory conditions in bushy tailed wood rats and 7 other small mammal [Neotoma fuscipes, Rattus norvegicus, Peromyscus maniculatus, Mus musculus, Sylvilagus nuttalli, Oryctolagus cuniculus and Cavia cobaya] host species. Larvae demonstrated strong host specificity for N. cinerea. Monthly trapping samples of wood rats in central Washington [USA] showed infection peaks of 65-70% in May and 30-40% in late summer. In laboratory-induced infections, wood rats supported 7 larvae without host mortality. Natural infections in trapped rats ranged from 1-6 per host. Larvae developed in lateral and dorsal warbles in laboratory and natural infections. Few wood rats demonstrated evidence of acquired immunity in repeated infections over 2 yr.

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