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. 1995 Jul;101(1):114–120. doi: 10.1111/j.1365-2249.1995.tb02286.x

Influence of the genetic pattern and sex of mice in experimental paracoccidioidomycosis.

L M Singer-Vermes 1, T N Sakamoto 1, C A Vaz 1, V L Calich 1
PMCID: PMC1553286  PMID: 7621580

Abstract

Eight genetically different strains of mice were compared regarding the dissemination of Paracoccidioides brasiliensis to the lungs, liver and omentum/pancreas, DTH responses and specific antibody production at 16 weeks after intraperitoneal infection with Pb18, a virulent P. brasiliensis isolate. The degree of dissemination of the infection varied: B10.A and C57B1/6, the most susceptible mouse strains, had positive cultures and high colony-forming unit (CFU) counts in all analysed organs. DBA/2 and A/Sn mice had negative cultures, being thus classified as the most resistant strains. CBA/J, C3H/HeJ, F1(A/SnxB10.A) and BALB/c mice were regarded as relatively resistant, since discrete fungal growth was observed only in one or two of the studied organs. All mouse strains, except B10.A mice, produced specific DTH responses which did not seem to be associated with the severity of disease. Production of high levels of specific antibodies was found in all strains except in the DBA/2 and C57B1/6 mice. The influence of the host sex on the outcome of paracoccidioidomycosis was evident only in susceptible animals: female B10.A mice displayed lower CFU counts in the three examined organs, whereas no differences were found between male and female A/Sn animals. The higher resistance of female B10.A mice was not accompanied by differences in their capacity to maintain a DTH reaction, nor in their production of antibody. This fact argues against the widely believed association of susceptibility to P. brasiliensis infection with both impaired DTH reactivity and increased humoral response.

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Selected References

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