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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Detection and characterization of Cryptosporidium species and genotypes in three chicken production systems in Brazil using different molecular diagnosis protocols

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Santana, Bruna Nicoleti [1] ; Kurahara, Brayan [1] ; Nakamura, Alex Akira [2] ; Camargo, Vinicius da Silva [1] ; Ferrari, Elis Domingos [1] ; da Silva, Giane Serafim [3] ; Nagata, Walter Bertequini [1] ; Meireles, Marcelo Vasconcelos [1]
Total Authors: 8
[1] Univ Estadual Paulista Unesp, Fac Med Vet, Rua Clovis Pestana 793, BR-16050680 Aracatuba, SP - Brazil
[2] FAI, Adamantina - Brazil
[3] Agencia Paulista Tecnol Agr, Inst Biol, Votuporanga - Brazil
Total Affiliations: 3
Document type: Journal article
Source: PREVENTIVE VETERINARY MEDICINE; v. 151, p. 73-78, MAR 1 2018.
Web of Science Citations: 4

The objective of this study was to determine the occurrence of Cryptosporidiwn spp. in domestic chickens raised in different chicken production systems in Brazil using three nested PCR protocols. The purification and concentration of oocysts present in 190 fecal samples from chickens raised in extensive, semi-intensive and intensive production systems were accomplished by centrifugal flotation in Sheather's solution and were followed by the extraction of genomic DNA. The detection and molecular characterization of Cryptosporidium species and genotypes were performed using three nested polymerase chain reaction (nested PCR) protocols targeting the 18S rRNA gene followed by sequencing of the amplified fragments. Subgenotyping of C. meleagridis was performed using a nested PCR reaction targeting the gp60 gene. Sample identified as Cryptosporidium sp. genetically similar to Cryptosporidiwn xiaoi and Cryptosporidium bovis by 18S rRNA gene sequencing were further analyzed by nested PCR targeting the actin gene and subsequent sequencing of the amplified fragment. Positive amplification for Cryptosporidiwn spp. was observed in 12.6% (24/190) of the samples, including C. baileyi (9.8%; 18/190), C. meleagridis (0.5%, 1/190), C. parvtun (2.1%; 4/190) and Cryptosporidium sp. (0.5%; 1/190). Subgenotyping of C. meleagridis revealed the presence of the zoonotic subtype IIIgA23G3R1. Sequencing of the 18S rRNA gene and the actin gene fragments revealed a Cryptosporidiwn genotype in an extensive poultry system genetically related to C. xiaoi and C. bovis. There was no significant difference in the frequency of positive results obtained by the three nested PCR protocols (p > 0.05); additionally, the agreement obtained by Kappa index ranged from substantial (0.70) to almost perfect (0.9). (AU)

FAPESP's process: 15/26334-8 - Cryptosporidium spp. in domestic birds and wild birds in the South and Southeast Brazil: occurrence, evaluation of methods of diagnosis and molecular characterization
Grantee:Marcelo Vasconcelos Meireles
Support Opportunities: Regular Research Grants