Antifungal resistance profile and enzymatic activity of Candida species recovered from human and animal samples
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Abstract
Candida is currently the most implicated pathogenic fungal species recognized as the major cause of a variety of human infections all over the world. This study investigated species distribution, enzymatic activities, and antifungal resistance profiles of human and animal Candida species. Clinical Candida species (n=220) were isolated from urine, high vaginal swab (HVS) and blood while Candida species
(n=128) were isolated from rectal swab, ear swab, blood, feces, and milk in animals: goat, sheep, cattle, pig and chicken. The identification of the species was performed using standard methods. Enzymatic activity was screened using plate methods. Susceptibility testing was carried out using disk diffusion and broth microdilution methods. A statistically significant difference (P=0.031) was observed in the distribution of Candida spp. recovered from humans and animals. The Pz values of human Candida species for proteinase, hemolysin, lipase and phospholipase were 0.65±0.97, 0.61±0.81, 0.59±0.47 and 0.76±0.74 respectively while that of Candida species recovered from animal were 0.67±0.13, 0.61±0.95, 0.62±0.67 and 0.69±0.70 respectively. No statistically significant difference (P>0.05) in the in vitro
enzymatic activity was observed between the two groups. High azole-resistance rate was observed. Resistance was higher among human Candida isolates compared to animal isolates although the difference was not considered statistically significant (p = 0.519). Our findings suggest that the enzymatic activity (virulence potential) and resistance patterns are similar in the two groups investigated. This study underscores the importance of animals especially pets and their products as potential sources/reservoirs of pathogenic and multi-azole resistant Candida species in Nigeria.
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