THE complex nature of chronic bronchitis makes it difficult to define the relative importance of the many factors that might contribute to its pathogenesis and course. 1,2 The progressive decline of ...
Local resistance to IBV (Massachusetts serotype) was observed in tracheal organ culture from birds previously immunized against the virus. This was evidenced, upon homologous virus inoculation, by the ...
The use of tracheal exudates for detecting precipitating infectious bronchitis (IB) antigen by the agar-gel precipitin (AGP) technique is described. Of 47 experimentally infected tracheas, 24 gave ...
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