| viral pathogenesis of a nephrotropic infectious bronchitis virus isolated from commercial pullets. | infectious bronchitis was diagnosed in 3-to-4-week-old pullets from an outbreak in a commercial flock in california. the disease was characterized by head swelling, watery discharge from the eyes and nostrils, and urates in kidneys. mortality ranged from 1.8% to 12.5% per week. the isolation of a coronavirus from a suspension of pooled kidneys from clinically ill chickens at the fifth passage in 10-day-old chicken embryos, gross and histologic renal lesions, and seroconversion by enzyme-linked i ... | 1991 | 1649594 |
| genetic diversity of avian infectious bronchitis virus california variants isolated between 1988 and 2001 based on the s1 subunit of the spike glycoprotein. | twenty-nine isolates of avian infectious bronchitis virus (ibv) recovered from commercial chicken flocks in california between 1988 and 2001 and identified as california variants by serotype and direct automated cycle sequencing of the ibv spike glycoprotein s1 subunit, were further characterized phylogenetically and by nucleotide sequence comparison. california variants were grouped according to production type of chicken, by comparison with public access sequence databases (ncbi genbank and em ... | 2003 | 12536299 |
| 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 ... | 2009 | 20095162 |
| attenuated live vaccine usage affects accurate measures of virus diversity and mutation rates in avian coronavirus infectious bronchitis virus. | the full-length genomes of 11 infectious bronchitis virus (ibv) field isolates from three different types of the virus; massachusetts (mass), connecticut (conn) and california (cal) isolated over a 41, 25 and 8 year period respectively, were sequenced and analyzed to determine the mutation rates and level of polymorphisms across the genome. positive selection was not detected and mutation rates ranged from 10(-4) to 10(-6)substitutions/site/year for mass and conn ibv types where attenuated live ... | 2011 | 21539870 |