• Korean Journal of Veterinary Research
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• v.8 no.1
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• pp.24-30
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• 1968

From 1962 to 1968, serum samples were collected from fowls of six provinces in Korea. The investigator tested for serum neutralizing antibody against the Beaudette strain of intecfious bronchitis virus. Twenty(40 percent)serum samples out of fifty revealed a neutralization index of more than 30. Neuralizing antibodies of infectious bronchitis virus are widely spread among chickens in Korea. Intensive poultry farming zones, adult chickens have been neutralizing antibody of infectious bronchitis virus.

• Korean Journal of Veterinary Research
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• v.9 no.2
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• pp.27-29
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• 1969

Observation of transmissive antibody was made on the rabbit inoculated in the virus of avian infection bronchitis. Throughout the studies, the following experimental results were obtained and summarized here. 1. The antibody of rabbit inoculated with the virus of avian infectious bronchitis were persisted for 2-years. 2. The antibody of adult rabbit against the avian infectious bronchitis virus were transmitted to the suckling rabbit and persisted for 15-weeks.

• Journal of the korean veterinary medical association
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• v.25 no.5
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• pp.282-291
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• 1989

Incidence of infectious bronchitis virus(IBV) infection in vaccinated breeder chickens was investigated by hemagglutination inhibition(HI)test for IBV using Mass 41 antigen. In the breeder chickens with the reduced egg production. chalky deposit. wrinkled

• Korean Journal of Veterinary Research
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• v.30 no.1
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• pp.79-84
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• 1990

A single inoculation of combined vaccines of Newcastle disease and avian infectious bronchitis of chicken, in a form of gel-oil emulsion type (gel-OEV) was tested their immunogenecity in chickens. The results were summerized as follows: 1. Average minimum and maximum ELISA antibody titers of ND were recorded 2407 and 13144 respectively. In the case of IB, 1824 and 4496 were recorded as minimum and maximum titers. 2. The distribution of average proportional groups, in the lowest and the highest, were 1.6 and 7.0 in ND ELISA and 1.4 and 2.8 in IB ELISA antibody titers. 3. ND ELISA antibody titers were significantly increased upto 7th week after the vaccination. On the other hand, IB ELISA antibody titers were raised upto 4th week after the vaccination.

• Korean Journal of Veterinary Service
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• v.25 no.1
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• pp.97-103
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• 2002

Infectious bronchitis(IB) is a viral disease in which continued evolution of the virus is of paramount importance for annual endemics and epidemics in chickens. Since the isolation of IB viruses(IBVs) in the 1930s, over 50 serotypes or variants have been reported worldwide. Continuing evolution is most prominent in the suface glycoproteins of IBV but also occurs in other parts of the genome. This genetic variability results from accumulation of molecular changes that can occur by a number of different mechanisms including genetic drift (point mutations) and genetic shift(RNA recombination). GA98 is a new serotype of IBV identified recently in the United States. In this paper, the evolutionary trend of IBV will be discussed using GA98 serotype as a model.

• Korean Journal of Poultry Science
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• v.27 no.2
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• pp.91-98
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• 2000

Phylogenetic tree constructed from the nucleotide sequences of the S1 gene showed that the 15 Korean strains of infectious bronchitis virus(IBV) examined were classified into 2 genetically distinct groups, except one respiratory strain, RB86, which was clustered with Massachusetts group. All the 5 respiratory strains belonged to Korean group I and the rest 9 nephropathogenic strains belonged to Korean group II according to the analysis, based on S1 gene sequences. Like previous classifications corresponded with the geographic origin, Korean stains were discriminated from geographically distinct reference strains of IBV. The nephropathogenic strains within Korean group IIsharing 96% homology were continuously isolated since 1990, and seemed to be genetically stable. Whereas the respiratory strains within Korean group Ⅰ sharing 88% homology were sporadically isolate since 1986m and seemed to be genetically unstable. Because we found putative accumulated point mutation as well as recombination events in Korean group Ⅰ, we discussed why genetic variations have often occurred in respiratory strains rather than nephropathognic strains.

• Korean Journal of Veterinary Service
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• v.21 no.2
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• pp.133-139
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• 1998

Serum samples collected from 30 breeders and their progeny 30 chicks. The antibodies against infectious bronchitis(IB), infectious bursal disease (IBD) and Newcastle disease(ND) viruses were detected by ELISA using commercial ELISA kit. The breeders were vaccinated against IB, IBD and ND viruses according to general vaccination program. Geometric mean titers(GMT) of ELISA were monitored from 1-day old to 17-day old chicks and compared with breeder chickens. The GMT of ELISA to IB, IBD and ND were declined half level of the breeder antibody titer at 6-, 8- and 7-day old. And, the GMT of ELISA to IB, IBD and ND were declined than that of protective titer at 6-, 1-, and 4-day old. Thereafter, the GMT of ELISA was declined and disappeared according to ages of chicks. Taken together, this study led to conclusion that time-course of maternal antibody titers of chicks from vaccinated breeders, and this is very important data for vaccination to chicks.

• KOREAN POULTRY JOURNAL
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• v.14 s.148
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• pp.85-87
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• 1982

• KOREAN POULTRY JOURNAL
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• v.10 no.2 s.100
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• pp.91-93
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• 1978

• KOREAN POULTRY JOURNAL
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• v.5 no.12 s.50
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• pp.94-97
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• 1973