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serological survey of infectious bursal disease virus serotypes 1 and 2 in california turkeys.the prevalence of two infectious bursal disease (ibd) viruses--serotype 1, of chicken origin, and serotype 2, of turkey origin--was studied in california turkeys. serum samples were collected from 15 turkey flocks representing nine counties. the virus-neutralization test was used. overall, only 15% of 342 samples were positive for serotype 1, whereas 89% were positive for serotype 2. however, 12 out of 15 flocks had a least one sample positive for serotype 1, and 14 out of 15 flocks had at least ...19846098247
characteristics of a very virulent infectious bursal disease virus from california.an outbreak of infectious bursal disease (ibd) in two california layer flocks resulted in the isolation of two infectious bursal disease viruses designated ra and rb. increased mortality plus gross and histopathology in the layer flocks suggested ra and rb could be very virulent infectious bursal disease virus (vvibdv). preliminary studies indicated that high mortality resulted when bursa homogenates from the layer farms were used to inoculate specific-pathogen-free (spf) chicks. in addition, ra ...200920095162
viral competition and maternal immunity influence the clinical disease caused by very virulent infectious bursal disease virus.the very virulent form of infectious bursal disease virus (vvibdv) causes an immunosuppressive disease that is further characterized by the rapid onset of morbidity and high mortality in susceptible chickens. in 2009, vvibdv was first reported in california, u. s. a., and since that time only a few cases of acute infectious bursal disease attributed to vvibdv have been recognized in california. in other countries where vvibdv has become established, it rapidly spreads to most poultry-producing r ...201122017037
health survey of backyard poultry and other avian species located within one mile of commercial california meat-turkey flocks.a survey was conducted to characterize domestic and exotic bird populations, estimate seroprevalence to selected disease agents, and describe health management practices on 62 premises containing "backyard" flocks located within one mile of 22 commercial california meat-turkey flocks participating in national animal health monitoring system (nahms). chickens were present on 56 backyard premises and turkeys on seven. antibodies were identified against mycoplasma gallisepticum, m. synoviae, m. mel ...19911854324
historical, spatial, temporal, and time-space epidemiology of very virulent infectious bursal disease in california: a retrospective study 2008-2011.in december of 2008 very virulent infectious bursal disease virus (vvibdv) was identified in a commercial flock in northern california. since then several other backyard and commercial facilities in california have had flocks affected by the same strain and other unique (previously unseen) strains of ibdv. previous to this incident, very virulent infectious bursal disease (vvibd) had never been identified in north america. following the initial outbreak in 2008, california became the first state ...201323678733
a cooperative approach to animal disease response activities: analytical hierarchy process (ahp) and vvibd in california poultry.very virulent infectious bursal disease virus (vvibdv) was first detected in the united states at the end of 2008. since its detection, federal and state animal health officials, the poultry industry and the research/academic community have led response activities through a collaborative effort. by june 2011, much still remained unknown regarding the basic epidemiology and ecology of vvibd in california, although there were a number of potential activities to fill this information gap. available ...201526113122
diversity of genome segment b from infectious bursal disease viruses in the united states.several phylogenetic lineages of the infectious bursal disease virus (ibdv) genome segment b have been identified. although this genome segment has been shown to contribute to virulence, little is known about the genetic lineages that exist in the united states. the nucleotide genome segment b sequences of 67 ibdv strains collected from 2002 to 2011 in the united states were examined. although they were from nine different states, a majority (47) of these viruses were from california. a 722-base ...201222545543
chicken anemia virus in broilers: dynamics of the infection in two commercial broiler flocks.chicken anemia virus (cav) can cause a disease syndrome characterized by severe anemia, bone marrow atrophy, and severe immunosuppression in young chicks. maternal antibodies prevent these clinical signs but do not prevent infection, transmission of the virus, or immunosuppression. the clinical disease is rare today because of the widespread practice of vaccinating breeders, but the subclinical form of the disease is ubiquitous. the dynamics of cav infection, cav antibody responses, relative lym ...200314708998
the diagnosis of very virulent infectious bursal disease in california pullets.this report documents the occurrence of a very virulent infectious bursal disease virus (vvibdv) in northern california commercial brown pullets. diagnosis was made from multiple accessions from two neighboring and epidemiologically related ranches submitted to the california animal health and food safety (cahfs) laboratory. pullets, 11 and 14 wk of age from ranch a (ra) and ranch b (rb) respectively, were submitted from infectious bursal disease virus vaccinated flocks experiencing a drastic in ...200919630244
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