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Jorge Luis Chacón
University of São Paulo
21Publications
10H-index
272Citations
Publications 21
Newest
#1Jorge Luis Chacón (USP: University of São Paulo)H-Index: 10
#2Luis Fabian N Nuñez (USP: University of São Paulo)H-Index: 5
Last.Antonio José Piantino Ferreira (USP: University of São Paulo)H-Index: 16
view all 6 authors...
Infectious laryngotracheitis (ILT) is a highly infectious respiratory disease that causes morbidity and mortality in commercial chickens. Despite the use of attenuated vaccines, ILT outbreaks have been described in broiler and long-lived birds. Molecular approaches, including polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP) and DNA sequencing, are used to characterize ILT viruses (ILTVs) detected in vaccinated and unvaccinated geographical regions. As part of an ILT ...
#1Luciana Allegretti (USP: University of São Paulo)H-Index: 3
#2L. Revolledo (USP: University of São Paulo)H-Index: 6
Last.Alberto Ferreira (USP: University of São Paulo)H-Index: 3
view all 7 authors...
In Brazil, the blue-fronted Amazon parrot (Amazona aestiva) is a common pet. The faecal microbiota of these birds include a wide variety of bacterial species, the majority of which belong to the Gram-positive lactic acid bacteria (LAB) clade. The aim of this study was to investigate differences in the diversity and abundance of LAB and Bifidobacterium spp. in the cloacae between wild and captive birds and to select, identify and characterise LAB for consideration as a parrot probiotic. Cloacal s...
#1Joelma Moura-Alvarez (USP: University of São Paulo)H-Index: 2
#2Luis Fabian N Nuñez (USP: University of São Paulo)H-Index: 5
Last.Antonio José Piantino Ferreira (USP: University of São Paulo)H-Index: 16
view all 8 authors...
Twenty-two flocks of turkeys affected by enteric problems, with ages between 10 and 104 days and located in the Southern region of Brazil, were surveyed for turkey by PCR for turkey astrovirus type 2 (TAstV-2), turkey coronavirus (TCoV), hemorrhagic enteritis virus (HEV), rotavirus, reovirus, Salmonella spp., and Lawsonia intracellularis (Li) infections. Eleven profiles of pathogen combination were observed. The most frequently encountered pathogen combinations were TCoV-Li, followed by TCoV-TAs...
#1Jorge Luis Chacón (USP: University of São Paulo)H-Index: 10
#2M. S. Assayag (USP: University of São Paulo)H-Index: 3
Last.A. J. Piantino Ferreira (USP: University of São Paulo)H-Index: 6
view all 7 authors...
Abstract1. The possibility that infectious bronchitis virus (IBV) variants isolated from broilers with enteric and respiratory problems have a different tropism and pathological outcome from those IBV strains causing classical respiratory disease was investigated.2. IBV variants were isolated from broiler flocks with enteric and respiratory problems in two regions of Brazil. The USP-10 isolate, of enteric origin, was inoculated via the oral oroculonasal routes into IBV-antibody-free broilers and...
#1Elena MettifogoH-Index: 9
Last.Antonio José Piantino Ferreira (USP: University of São Paulo)H-Index: 16
view all 8 authors...
Several viruses have been identified in recent years in the intestinal contents of chickens and turkeys with enteric problems, which have been observed in commercial farms worldwide, including Brazil. Molecular detection of these viruses in Brazil can transform to a big threat for poultry production due to risk for intestinal integrity. This disease is characterized by severely delayed growth, low uniformity, lethargy, watery diarrhea, delayed feed consumption, and a decreased conversion rate. C...
#1Jorge Luis Chacón (USP: University of São Paulo)H-Index: 10
#2Juliana Nogueira Rodrigues (USP: University of São Paulo)H-Index: 2
Last.Antonio José Piantino Ferreira (USP: University of São Paulo)H-Index: 16
view all 6 authors...
As part of an epidemiological study of infectious bronchitis virus (IBV) in Brazil, 252 samples from IBV-suspect flocks were tested and the IBV-positive samples were analysed by sequencing of hypervariable regions 1 and 2 of the S1 gene. A high prevalence of IBV variants was found and the sequence analysis of 41 samples revealed a high molecular similarity among the Brazilian isolates (from 90.2 to 100% and from 85.3 to 100% nucleotide and amino acid identity, respectively). The Brazilian isolat...
#1Jorge Luis Chacón (USP: University of São Paulo)H-Index: 10
#2Matheus Y. Mizuma (USP: University of São Paulo)H-Index: 2
Last.Antonio José Piantino Ferreira (USP: University of São Paulo)H-Index: 16
view all 8 authors...
SUMMARY. Avian metapneumovirus (AMPV) causes turkey rhinotracheitis and is associated with swollen head syndrome in chickens, which is usually accompanied by secondary infections that increase mortality. AMPVs circulating in Brazilian vaccinated and nonvaccinated commercial chicken and turkey farms were detected using a universal reverse transcriptase (RT)-PCR assay that can detect the four recognized subtypes of AMPV. The AMPV status of 228 farms with respiratory and reproductive disturbances w...
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