A condition similar to egg-drop syndrome-1976 (EDS-76) occurred in 14 broiler breeding flocks in 2 farms in Japan from December 1978 to January 1980, and it was diagnosed as EDS-76 by serologic and virological investigations. Egg production fell suddenly when the hens were 30 to 55 weeks of age, and the depression lasted 3 to 7 weeks. Production fell 6 to 25%. Depressed egg production was accompanied by the laying of shell-less, soft-shelled, and thin-shelled eggs associated with loss of egg-shell pigment. Eleven isolates of hemagglutinating adenovirus were isolated from cloacal swabs (10 isolates) and a uterus (1 isolate) of hens in one farm. One isolate, cloned and named JPA-1, had the same antigenicity in serologic tests and the same biological and physicochemical properties as the BC14 strain of EDS-76 virus.
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First report on genetic characterization of egg drop syndrome 1976 virus in Egypt.
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J Vet Diagn Invest
March 2014
1Andrea Vögtlin, Institute of Virology and Immunology (IVI), Sensemattstraße 293, 3147 Mittelhäusern, Switzerland.
Between 2008 and 2012, commercial Swiss layer and layer breeder flocks experiencing problems in laying performance were sampled and tested for infection with Duck adenovirus A (DAdV-A; previously known as Egg drop syndrome 1976 virus). Organ samples from birds sent for necropsy as well as blood samples from living animals originating from the same flocks were analyzed. To detect virus-specific DNA, a newly developed quantitative real-time polymerase chain reaction method was applied, and the presence of antibodies against DAdV-A was tested using a commercially available enzyme-linked immunosorbent assay.
View Article and Find Full Text PDFRestriction enzyme analysis of Indian isolates of egg drop syndrome 1976 virus recovered from chicken, duck and quail.
Vet Res Commun
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Division of Avian Diseases, Indian Veterinary Research Institute, Izatnagar 243 122, UP, India.
Egg drop syndrome 1976 (EDS-76) is caused by a haemagglutinating adenovirus belonging to group III of the genus Aviadenovirus in the family Adenoviridae. All isolates are serologically identical, but have been divided into three groups based on restriction endonuclease (RE) analysis. In this study the viral DNA of various Indian EDS-76 viral isolates (CEDS-A, CEDS-B, EDS-M, EDS-ML, EDS-1/AD/86, EDS-KC and QEDS) obtained from different avian species and different geographical regions were digested with restriction endonucleases viz.
View Article and Find Full Text PDFNo evidence for adaptation of current egg drop syndrome 1976 viruses to chickens.
Avian Dis
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Department of Infectious Diseases, National Institute of Animal Health, 3-1-5 Kannondai, Tsukuba, Ibaraki 305-0856, Japan.
In order to determine whether the current field strains of egg drop syndrome (EDS) 1976 viruses adapt to chickens, we compared the growth efficiency of three Japanese field strains (PA-1/79, AWI/98, Gifu/01) in chicken and duck embryo liver cells. The growth efficiency in chicken or duck embryo liver cells was almost similar in these strains. The fiber protein may carry the type-specific antigen and the hemagglutination activity, and hexon protein may contain the subgroup-specific antigenic determinants.
View Article and Find Full Text PDFDetection of egg drop syndrome 1976 virus by polymerase chain reaction and study of its persistence in experimentally infected layer birds.
Acta Virol
February 2004
Division of Avian Diseases, Indian Veterinary Research Institute, Izatnagar 243 122, Bareilly, U.P., India.
Polymerase chain reaction (PCR) assay was developed for the detection of Egg drop syndrome 1976 (EDS-76) virus in tissues, namely in the uterus, spleen and buffy coat. It was also used to study the persistence of the virus in tissues of experimentally infected layer birds. The PCR assay could detect as little as 10 fg of purified EDS-76 viral DNA.
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