Jun 1, 1976

In vitro differentiation and pH sensitivity of field and cell culture-attentuated strains of transmissible gastroenteritis virus

Infection and Immunity
R G Hess, P A Bachmann

Abstract

Characteristics of four transmissible gastroenteritis (TGE) virus field strains (Miller, Purdue, Bl, and V203) and four cell culture-attenuated strains (Purdue, SH, CKp, and Bl) were studied to find methods of differentiation between the two groups of viruses. TGE field virus strains did not replicate as well as attenuated strains at 37 C and could not be passaged serially for more than four to six passages at 33 C. There were clear differences in plaque size when the strains were compared. Field strains had average plaque sizes ranging from 3.59 to 3.15 mm, whereas attenuated strains induced plaques that were larger than 4.2 mm. Variations were observed in stability of strains at pH 3.0. Field strains and cell culture-attenuated strains CKp-270 and SH-114 were reduced in titer by about 1 log10. A reduction of about 3 log10, however, was obtained with cell culture strains B1-300 and Purdue-113.

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Mentioned in this Paper

Viral Vaccines
Transmissible gastroenteritis virus
Vaccines, Attenuated
Virus Replication
Cell Culture Techniques
Bacteriophage Plaque Assay
Dental Plaque
Cell Differentiation Process
Senile Plaques
PH.3

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