Consulta: creatorFacets:"Ferreira,AJP"
Registros recuperados: 10
Data/hora: 13/06/2024 23:16:32

Identification of turkey astrovirus and turkey coronavirus in an outbreak of Poult Enteritis and Mortality Syndrome
Provedor de dados: 89
Autores: Villarreal,LYB; Assayag,MS; Brandão,PE; Chacón,JLV; Bunger,AND; Astolfi-Ferreira,CS; Gomes,CR; Jones,RC; Ferreira,AJP.
This article reports a survey on turkey astrovirus (TAstV) and turkey coronavirus (TCoV) infections with RT-PCR in 17 turkey flocks affected by acute enteritis and two apparently normal turkey flocks located in the Southeastern region of Brazil by PCR (TAstV and TCoV). Seven out of the 17 affected flocks were positive for TAstV and 14 for TCoV, with seven co-infections. In one of the two apparently normal flocks, a TAstV-TCoV co-infection was found. Although a definitive association of these agents and the signs can not be made, the implications of these findings are discussed.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Astrovirus; Coronavirus; Turkey; Enteritis; Diagnosis.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2006000200010

Epidemiology of Avian Infectious Laryngotracheitis with Special Focus to South America: an update
Provedor de dados: 89
Autores: Parra,SHS; Nuñez,LFN; Ferreira,AJP.
ABSTRACT Avian Infectious laryngotracheitis (AILT) is a respiratory tract disease of great importance because it causes significant economic losses in the poultry industry around the world. It is caused by a Gallid herpesvirus type 1, a member of the genus Iltovirus. The target system for Avian Infectious Laryngotracheitis virus (AILTV) infections is the respiratory system, and the main organ in which the virus remains latent is the trigeminal ganglia. However, the virus has demonstrated tropism for other organs besides the respiratory tract. The main transmission routes are ocular and respiratory. Infected birds with clinical symptoms are main sources of transmission, but birds with latent infections, litter, and contaminated fomites may also transmit the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Avian infectious laryngotracheitis; Biosecurity; Epidemiology; South America; Chicken.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2016000400551

Detection by Rt-Pcr and Molecular Characterization of Tremovirus A Obtained from Clinical Cases of Avian Encephalomyelitis (AE) Outbreaks in Brazil
Provedor de dados: 89
Autores: Torre,D De la; Nuñez,LF; Parra,SHS; Astolfi-Ferreira,CS; Ferreira,AJP.
ABSTRACT This study determined the presence of Tremovirus A as the possible agent related to Avian Encephalomyelitis in broiler chicks from the states of São Paulo (SP) Paraná (PR), Goiás (GO), Santa Catarina (SC) and Rio Grande do Sul (RS), between the years 2006 and 2015. Samples of the nervous, digestive, respiratory, immune, and renal systems, plus muscular organs from broiler chicks with neurological problems such as ataxia and muscle tremors, and four (4) commercial vaccines as positive control, were tested by reverse-transcriptase (RT-PCR) amplification and DNA sequencing. A highly conserved region (P1) of the viral genome, was used to amplify a segment which encodes a structural protein VP4. Out of 112 samples, 46 were positive (42%) for Tremovirus...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chicken; Tremovirus A; Avian Encephalomyelitis; Detection; Molecular characterization.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2018000300527

Enteric viruses in turkey flocks: a historic review
Provedor de dados: 89
Autores: Alavarez,JM; Ferreira,CSA; Ferreira,AJP.
In this review, diagnostic techniques and viral agents involved in enteric diseases affecting turkeys are described. Data from field observations and laboratory researches have been reported in turkey flocks for over 70 years, and several viruses have been identified. After a period of 30 years of inoculation experiments and neutralization studies, adequate visualization of the viruses was achieved using electronic microscopy. During the following years, several studies were then conducted to isolate and classify those viruses using cell-culture, embryo-propagation, serological tests, genome electropherotyping by polyacrylamide gel electrophoresis of double-stranded RNA viruses, and recently, nucleic acid studies. Thus, since the 1990s, the nucleic-acid...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Turkey; Enteritis; Viruses; Poults; Diagnosis.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2014000300001

Dexamethasone Regulates Macrophage and Cd4+Cd25+ Cell Numbers in the Chicken Spleen
Provedor de dados: 89
Autores: Calefi,AS; Quinteiro-Filho,WM; Fukushima,AR; Cruz,DSG da; Siqueira,A de; Salvagni,FA; Namazu,LB; Gomes,COMS; Ferreira,AJP; Palermo Neto,J.
Abstract Dexamethasone (DEX) is a corticoid hormone that is experimentally used to mimic the effects of increased levels of endogenous corticosterone observed during the stress response. Currently, stress is considered one of the major predisposing factors for diseases in the poultry industry. The aim of this study was to analyze the effects of DEX and/or of a 20-fold coccidial vaccine dose on leukocyte phenotypes in the spleen and cecal tonsils of chickens. Twenty specific-pathogen-free (SPF) Leghorn chickens were divided into four groups: a non-treated group (NT), a DEX-treated group (Dex), a vaccinated group (V) and a DEX-treated+vaccinated group (Dex+V). On experimental day (ED) 42, each bird in the vaccinated groups received a anti-coccidial vaccine....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Coccidiosis; Eimeria; Avian immunology; Flow cytometry; Neuroimmunomodulation.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2016000100093

Survey of infectious laryngotracheitis outbreak in layer hens and differential diagnosis with other respiratory pathogens
Provedor de dados: 89
Autores: Chacón,JLV; Brandão,PEB; Villarreal,LYB; Gama,NM; Ferreira,AJP.
Trachea, lung, and conjunctive samples from 51 commercial layer farms from Bastos region, São Paulo, Brazil, were submitted to nested-PCR and virus isolation in SPF chicken embryos for ILT diagnosis. This region experienced an outbreak characterized by respiratory signs, decrease in egg production and increased mortality. Out of the 51 tested field samples, 23 were positive for ILT by nested-PCR, 22 were positive after the virus isolation, and 24 were positive when both techniques were used. Newcastle disease virus, Avian pneumovirus, or Mycoplasma gallisepticum were not detected. Infectious bronchitis virus was detected in one farm and Mycoplasma synoviae was detected in eight farms. The high incidence of infectious laryngotracheitis virus (ILTV)...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Infectious laryngotracheitis; Nested-PCR; Virus isolation.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2007000100009

Detection and molecular characterization of infectious laryngotracheitis virus in laying hens in Brazil
Provedor de dados: 89
Autores: Villarreal,LYB; Brandão,PEB; Chacón,JLV; Doretto Junior,L; Ito,N; Gama,NS; Ishizuka,MM; Luchese,A; Buchala,F; Astolfi-Ferreira,CS; Ferreira,AJP.
Avian Infectious Laryngotracheitis, caused by Infectious Laryngotracheitis Virus (ILTV), has been reported for decades in Brazilian laying and broiler flocks. More recently, outbreaks have occurred in São Paulo State. This study reports the application of PCR and DNA sequencing targeted to the p32 gene of ILTV using laying chicken samples from Bastos, São Paulo, Brazil. Three out of four field samples were positive by PCR. DNA sequencing of two samples evidenced homology of the amplified fragments with the p32 gene of ILTV. The results definitely confirmed the presence of ILTV in the birds during the outbreak. Further studies are needed to establish the sources of infection and to determine whether the detected virus was originated from vaccine or field...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Avian infectious laryngotracheitis; Brazil; P32; PCR; Sequencing.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2004000400011

Molecular Diagnostic of Chicken Parvovirus (ChPV) Affecting Broiler Flocks in Ecuador
Provedor de dados: 89
Autores: Torre,D De la; Nuñez,LFN; Puga,B; Parra,SHS; Astolfi-Ferreira,CS; Ferreira,AJP.
ABSTRACT Enteric diseases affect poultry and cause important economic losses in many countries worldwide. Avian parvovirus has been linked to enteric conditions, such as malabsorption and runting-stunting syndrome (RSS), characterized by diarrhoea, and reduced weight gain and growth retardation. In 2013 and 2016, 79 samples were collected from different organs of chickens in Ecuador that exhibited signs of diarrhea and stunting syndrome, and analysed for the presence of chicken parvovirus (ChPV). The detection method of ChPV applied was Polymerase Chain Reaction (PCR), using primers designed from the conserved region of the viral genome that encodes the non-structural protein NS1. Out of the 79 samples, 50.6% (40/79) were positive for ChPV, and their...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chicken parvovirus; Enteric diseases; Molecular diagnostic; PCR.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2018000400643

Rotavirus detection and isolation from chickens with or without symptoms
Provedor de dados: 89
Autores: Villarreal,LYB; Uliana,G; Valenzuela,C; Chacón,JLV; Saidenberg,ABS; Sanches,AA; Brandão,PE; Jerez,JA; Ferreira,AJP.
Rotaviruses have been identified as one of the main etiological agents of diarrhea and enteritis in mammals, including humans, and in avian species. Few studies have been published about enteric viruses in Brazilian poultry, including those related to rotavirus infection. Such studies demonstrate significant occurrence and the importance of enteric viruses in poultry presenting intestinal problems. Enteric viruses are the primary cause of injuries to the gut, allowing other agents, especially bacteria, to attach, to penetrate, and to replicate in the enteric tissue, leading to further damage. The aim of the present study was to detect rotavirus in the intestinal contents of layers and broilers by polyacrylamide gel electrophoresis (PAGE) and virus...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Enteric viruses; Rotavirus; Isolation; MA104 cells; Chicken.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2006000300009

SURVEILLANCE FOR NEWCASTLE DISEASE VIRUS, AVIAN INFLUENZA VIRUS AND MYCOPLASMA GALLISEPTICUM IN WILD BIRDS NEAR COMMERCIAL POULTRY FARMS SURROUNDED BY ATLANTIC RAINFOREST REMNANTS, SOUTHEASTERN BRAZIL
Provedor de dados: 89
Autores: Guimarães,MB; Hurtado,R; Bello,CP; Vanstreels,RET; Ferreira,AJP.
ABSTRACT The geographic overlap between areas of Atlantic rainforest and human activities allows interactions to occur between humans and wild and domestic animals. Despite the great importance of the domestic animal-wildlife-human interface that occurs at poultry farms in terms of public health, economic production and wildlife conservation, there are few studies in Brazil examining the distribution and health of wild birds that interact with poultry farms. From January to December 2010, mist nets were used to capture 166 free-ranging birds that were within close proximity to three poultry farms in Atlantic rainforest remnants in south-eastern Brazil. The species composition was examined, and molecular methods were used to test for avian influenza virus,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Surveillance; Atlantic rainforest; Poultry farms; Wild birds; Influenza virus; Newcastle disease virus; Mycoplasma gallisepticum.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2016000300387