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Seminar 793  

Seminar:  793
1
Speaker(s)
Kuo, Shu-Ting
Topic
The introduction to the morphology of capripoxviruses using EM
Abstract
In recent years, the electron microscope performance and accessory devices were promoted and the observation of viral structure and the estimation of viral size become simple and direct. The first goat pox case occurred in Taiwan in 2008. Epidemic outbreak of sheep pox was in April 2010 and 630 inspection samples examined by electron microscopic .The morphology of capripoxviruses is brick-type and the size is about 270 × 290 nm. The virus surface of tubular corpuscle constitute filaments structure.
2
Speaker(s)
Yu, Chao-Fang; Huang, Tien-Shine; Huang, Chin-Cheng
Topic
Safety and Potency Test on Trivalent Avirulent Live Vaccine and Inactivated Bacterin from DRL againstRiemerella anatipestiferInfection
Abstract
The purpose of the study is to evaluate commercial live trivalent Riemerella anatipestifer(RA) vaccine and inactivated bacterin from DRL. The results showed that a live vaccine is safe in duckling and gosling exposed to the recommended dose. The Beherens-Karber method was used to determine the protection index based on LD50 from vaccinated and control animals. The vaccine induced good protection against homologous serotype challenge in RA-free duckling but poor in those with maternal antibody. The potency tests revealed satisfactory protection using both a live vaccine with following inactivated bacterin booster and two injections of bacterin; however there is no significant difference between these two groups. Aerosol administration of a live vaccine with inactivated bacterin booster injection was found to be efficacious against challenging in field trial.
3
Speaker(s)
Cheng, Ming-Chu
Topic
Avian Influenza virus surveillance in Wild Birds in 2009 and H4 AIV phylogenetic analysis
Abstract
The objective of this report is to analysis the surveillance data on avian influenza virus (AIV) in wild birds in 2009 and the phylogenetic analysis of H4 gene.  In 2009, a total of 5,804 specimens collected from the wild birds in Taiwan for active and passive surveillance. Thirty-five AIVs were isolated from waterfowl specimens on active surveillance. The highest monthly prevalence was in October (2.87%), higher than in the same month in last year (1.84%). The year prevalence of active surveillance on waterfowl was much the same as before last year (0.81 - 0.82%).  Most of AIVs were isolated from the specimens of duck. Although, the prevalence in shorebirds (0.84%) was lower than in ducks (1.02%), but higher than last year (0.43%) and before last year (0.05%).  All of the isolated AIVs were distributed into 15 different H/N subtypes. Most isolates were belonged to H4N6 subtype (seven in 35 isolates). Five different N subtypes of 11 H7 viruses; H7N2, H7N3, H7N5, H7N7 and H7N9, were isolated in 3 different sampling areas and times. These viruses were identified as the nonpathogenic strains by the results of IVPI test and the amino acid moti at cleavage site of hemagglutinin protein. In the results indicated that, no any highly pathogenic avian influenza viruses had be fund in the specimens of active and passive surveillance.