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The chemo therapy of rodent malaria 32. the influence of p amino benzoic acid on the transmission of plasmodium yoelii and plasmodium berghei by anopheles stephensi



The chemo therapy of rodent malaria 32. the influence of p amino benzoic acid on the transmission of plasmodium yoelii and plasmodium berghei by anopheles stephensi



Annals of Tropical Medicine and Parasitology 74(3): 276-282



More oocysts of P. yoelii developed in A. stephensi if the mosquitoes received a supplement of p-aminobenzoic acid (PABA) in their diet prior to taking an infective blood meal, than in unsupplemented control insects. The optimum concentration was 0.05% PABA in 10% sucrose. This effect was not observed if the blood meal was taken prior to feeding with PABA. Similarly, PABA administered to gametocyte-carrying mice increased the numbers of oocysts developing in mosquitoes fed on them subsequently, the effect also being dose-dependent and not mediated through an increase in gametocyte numbers. Sulfadoxine (which blocks PABA uptake) had the opposite action, reducing the numbers of oocysts either when fed directly to mosquitoes or to donor mice. These results are discussed with reference to a possible relationship between sulfonamides and contaminating microorganisms in the vector mosquitoes.

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Accession: 006614072

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