Infected
horses
Snail
hunters
Snails
Cercaria
Identification
and distribution of snail reservoirs of Ehrlichia risticii,
the agent of Potomac horse fever by John
E. Madigan
Determination
of the life cycle and the mode of transmission of the agent of Potomac
horse fever (98-02) by John
E. Madigan
Spirochaeta
and Rickettsia Laboratory