A1 Refereed original research article in a scientific journal

Molecular Detection of Medically Important Candida species from Droppings of Pigeons (Columbiformes) and Captive Birds (Passeriformes and Psittaciformes)




AuthorsQueiroz-Aaltonen Isabelle Regina de, Neto Marcílio Ferreira de Melo, da Fonseca Luísa Andrea Villanueva, Silva Denise Maria Wanderlei, Fernanda Cristina Albuquerque Maranhão

PublisherInstituto de Tecnologia do Paraná - Tecpar

Publication year2021

Journal: Brazilian Archives of Biology and Technology

Journal name in sourceBRAZILIAN ARCHIVES OF BIOLOGY AND TECHNOLOGY

Journal acronymBRAZ ARCH BIOL TECHN

Article numbere21200763

Volume64

Number of pages11

ISSN1516-8913

eISSN1678-4324

DOIhttps://doi.org/10.1590/1678-4324-2021200763

Web address https://www.scielo.br/j/babt/a/dS8xsQLg4V5rWrbGKMYmSqy/?lang=en

Self-archived copy’s web addresshttps://research.utu.fi/converis/portal/detail/Publication/69254268


Abstract

Passeriformes and Psittaciformes birds and pigeons (Columba livia) are known to be reservoirs of microorganisms, and their stool allows fungi development. Since accumulated avian excreta can interfere with public health, this study aimed to perform a molecular screening of medically important Candida species in pigeon droppings in public places and birds raised in captivity. Excreta collected from captive birds (3 residences) and pigeons (4 districts) were inoculated on Sabouraud dextrose agar with chloramphenicol for Gram staining and subculture on Hicrome® Candida. Three DNA extraction methods were performed for comparison (commercial kit, in-house and by boiling) and PCR to screen 6 clinically important Candida species among the isolates. The correlation between phenotypic and molecular methods was calculated by kappa/K. Only 6 C. parapsilosis (20%) were identified from captive birds’ feces among 30 isolates (80% not identified), while pigeons’ feces harbored a greater diversity, with the 6 pathogenic species confirmed among 41 isolates: C. albicans (31.70%/13), C. krusei (14.63%/6), C. tropicalis (14.63%/6), C. parapsilosis (17.10%/7), C. glabrata (14.63%/6) and C. guilliermondii (7.31%/3); 100% correlation between tested methods (K = 1) for the first 3 species. Boiling DNA extraction method was fast and efficient to obtain viable DNA from Candida spp. for PCR. Our results indicate that pigeon droppings harbor more potentially pathogenic species than birds in residential captivity, which probably have non-albicans Candida less frequently isolated in infectious processes. The greater availability of nutrients may have contributed to a diversity of Candida spp. in feces from public environments.


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