Occurrence ofCryptosporidium hominisin cattle bordering the Lake Mburo National Park in Kiruhura district, Western Uganda
AbstractBackgroundCryptosporidiumis an emerging opportunistic zoonotic pathogen that causes diarrheal illness in a wide range of hosts including livestock and humans. Globally there is exponential increase in livestock production to meet the worlds’ demand for animal protein as well as for financial reasons. However, there is raised concern of the public health threat due to contamination of the environment by livestock waste carrying zoonotic pathogens such asCryptosporidium. This study set out to establish the prevalence ofCryptosporidiumas well as the circulating genotypes in order to elucidate the potential role of cattle in the spread of human cryptosporidiosis. We collected rectal coprological samples from 363 cattle in 11 households in Kiruhura district, Southwestern Uganda. The samples were screened for presence ofCryptosporidiumoocysts using the phenol auramine staining method followed by fluorescent microscopy. DNA was then extracted from the microscopy positive samples and the COWP gene amplified using PCR. Amplified gene products were sequenced and subjected to phylogenetic analysis.ResultsThe overall animal level prevalence ofCryptosporidiumwas 7.7% (95% CI: 5.1-10.9), and herd level prevalence was 33.3% (95% CI: 18.5-52.2). We found a statistically significant difference (p=0.02) between infection in bulls as compared to cows. There was however no significant difference in the prevalence among the different cattle breeds sampled, with the following prevalence’s observed in Crosses 9.2%, Ankole 5.7%, Friesian 7.1%, and Boran 2.8% respectively. The COWP gene was successfully amplified from 20 of the 28 microscopy positive samples. All the sequenced DNA amplicons were confirmed to beC. hominis, with 98%-100% identity to sequences in the GenBank.C. hominiswas the only genotype isolated from this study, further asserting that cattle could be a potential high risk source of human cryptosporidiosis.ConclusionThis study represents the first time naturally occurringC. hominishas been isolated from cattle in Uganda. This further provides evidence of cattle possibly being biological reservoirs forC. hominisand cattle could be a potential high risk source of human cryptosporidiosis.