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Reproduction-inhibiting and parasiticidal effects on Plasmodium gallinaceum and Plasmodium lophurae during initial infection and homologous superinfection in chickens



Reproduction-inhibiting and parasiticidal effects on Plasmodium gallinaceum and Plasmodium lophurae during initial infection and homologous superinfection in chickens



Jour Infect Dis 86(3): 275-294



Homologous immunity to superinfection in chickens was mainly parasiticidal against both P. gallinaceum and P. lophurae and acted on both free merozoites and intracorpuscular erythrocytic stages. To a less extent it inhibited reproduction by reducing the merozoite mean per segmenter and prolonging the asexual cycle. Thus,97-99% of a superinfecting population was often destroyed within 36 hrs., while reproduction was only temporarily decreased 10-50%. When optimal numbers of parasites with a normal merozoite mean and asexual cycle were introduced into latently infected chickens, the merozoite mean decreased sooner and reached a lower value, crisis forms appeared sooner and growth was sometimes slightly slower (lengthening of the asexual cycle) than in initial infections. These reproduction-inhibiting effects, which were not apparent when the superinfecting dose was large enough to break down acquired immunity, are apparently associated with fundamentally parasiticidal mechanisms (antibodies). After the acquisition of a high grade immunity as after the crisis, the few surviving parasites of each brood are removed from the blood before observations can be made on degeneration (as evidenced by crisis forms, lowered merozoite mean and lengthening of the asexual cycle).

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Accession: 023510137

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PMID: 15415632

DOI: 10.1093/infdis/86.3.275



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