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Funkční a patologické změny žaludku hostitelů reinfikovaných různými druhy a genotypy žaludečních kryptosporidií
MARKOVÁ, Marie
Representatives of the genus Cryptosporidium are intracellular parasites from the phylum Apicomplexa that parasitise the gastrointestinal tract of vertebrates. Within the genus, the species are divided into two groups depending on the site of infection: intestinal and gastric cryptosporidia. Infection with intestinal species is associated with watery diarrhoea, while infection with gastric species is usually asymptomatic. However, studies have indicated histopathological changes in gastric tissue during infection with these species. This work focuses on the influence of infection and reinfection with Cryptosporidium proliferans and Cryptosporidium muris CAT21 on gastric pH, morphological and pathological changes of the gastric mucosa in experimental mastomys and the mouse strains BALB/c and C57Bl6. In mice infected with C. muris CAT21, an increase in stomach pH was observed only after the primary infection; during reinfection, no increase in pH was observed on any of the days observed. In both groups, an increase in mucosal thickness was observed during infection, but was not as pronounced in BALB/c mice during reinfection as during primary infection. In C57Bl6 mice, reinfection resulted in a slight thickening, but no significant peak was observed and mucosal thickness remained similar. Inflammatory infiltrates were present in the tissue of both BALB/c and C57Bl6 mice during both infection and reinfection. Reinfection with C. proliferans led to an increase in gastric pH in both BALB/c and C57Bl6 mice. Although morphological changes were observed after reinfection, they were less pronounced. The results indicate that reinfection can influence the immune response and gastric morphology, but does not cause significant changes in pH. In addition, the influence of acidic water administration on the course of C. proliferans infection was investigated. No significant differences in the course of infection and pathological changes were observed between groups of mastomys supplied with acidic and tap water and infected with C. proliferans.
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