Abstract
Nasal epithelial cells were collected by cotton swabs for the diagnosis in experimental and field cases of infectious bovine rhinotracheitis and field cases of bovine viral diarrhea in calves. A portion of the cells was washed twice in phosphate buffered saline and a 25 µL drop was placed on microscope slides. The cells were dried, fixed and stained according to the direct fluorescent antibody technique. Another portion of the same specimen was inoculated onto primary bovine skin cell cultures for virus isolation. In the experimental studies for infectious bovine rhinotracheitis, 29/35 specimens were positive by fluorescent antibody technique and 32/35 by cell culture and in the field cases, 22/119 were positive by fluorescent antibody technique and 19/119 by cell culture. In the field cases of bovine viral diarrhea, 28/69 samples were positive by fluorescent antibody technique and 14/69 by cell culture. When fluorescent antibody technique was performed on inoculated cell cultures a total of 24/69 specimens were positive for bovine viral diarrhea. The sensitivity of fluorescent antibody technique was thus comparable to that of cell culture method for infectious bovine rhinotracheitis and bovine viral diarrhea.
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