A Summer Survey of the Parasites of Two Microtus pennsylvanicus pennsylvanicus (Ord) Populations

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Abstract
The seasonal incidence of 3 hemo-parasites, Babesia microtia, Trypanosoma microti, and Haemobarto-nella microti of the field mouse, M. p. pennsylvanicus was studied from June to Oct., 1954 in 2 collecting areas at Ithaca, N. Y. One area was wet with some standing water in the spring, and the other well drained and dry. Babesia infections were most prevalent in the wet field, Haemobartonella in the dry field, tending to diminish during the course of this study. The number of trypanosome infections tended to remain constant in both areas. Some favorable interaction between the trypanosomes and the sporozoan in multiple infections was observed, as well as a possible unfavorable interaction between Haemobartonella and either the trypanosome or the sporozoan. There was no significant effect of the parasites upon the mortality of the mice, nor was there any significant difference in rates of infection between sexes or among age groups.
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