Experimental Transmission of the Rickettsiae of the Spotted Fevers of Brazil, Colombia, and the United States by the Argasid Tick Ornithodoros nicollei

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Abstract
The argasid tick, O. nicollei, engorged in the first nymphal stage on guinea pigs infected with the spotted fevers of Brazil, Colombia, and the U. S., respectively, subsequently transmitted the specific agents by feeding on fresh guinea pigs. The ticks remain infective throughout the nymphal and adult stages and transmit the rickettsiae of Brazilian and Colombian spotted fever through the egg to the next generation. Evidence of infection of guinea pigs is apparent earlier following the larval feeding in the Fl generation than following feeding in the later developmental or adult stages. This suggests that the larvae may be the most efficient transmitters.