Abstract
THE limitation to the value of the diagnostic procedure of examining bovine fæces for the larvæ of Dictyocaulus viviparus has become increasingly clear during recent years. It has always been realized that immature worms would not reveal their presence in this way, and more recently the effect of host resistance has been recognized in reducing the rate of egg production by the female worms. A third source of error in attempting to diagnose parasitic bronchitis in cattle by fæcal examinations has now come to our notice, in that we have found Dictyocaulus larvæ invading the lungs of a partially resistant host, to be retarded in their development for some weeks and in some instances for months, and to constitute a possible source of disease that could not be detected by ordinary means even on post-mortem examination.
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TAYLOR, E., MICHEL, J. Inhibited Development of Dictyocaulus Larvæ in the Lungs of Cattle and Sheep. Nature 169, 753 (1952). https://doi.org/10.1038/169753a0
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DOI: https://doi.org/10.1038/169753a0
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