Summary
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1.
The clinical and pathological pictures produced in experimental swine by a strain of swine pox virus obtained in Iowa are described.
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2.
The infective agent is a virus of the elementary body type and is capable of storage in glycerol for relatively long periods of time. It is not pathogenic for rabbits and failed to lapinize in four “blind” serial passages in rabbits.
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3.
One attack of swine pox renders pigs solidly immune to reinfection, but the presence of virus-neutralizing antibodies in the sera of recovered swine is quite irregular.
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4.
Hog lice are capable of transmitting swine pox virus from animal to animal but probably serve more as mechanical vectors than as true intermediate hosts.
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5.
Vaccinia virus and the strain of swine pox virus studied in this investigation are not immunologically related.
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6.
It is suggested that discrepancies in the literature concerning the relationship between vaccinia and swine pox viruses may indicate the existence in swine under field conditions of two distinct pock diseases. One of these diseases is probably caused by infection with vaccinia virus while the other is caused by infection with a virus of the type studied in the present investigation.
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Shope, R.E. Swine pox. Archiv f Virusforschung 1, 457–467 (1940). https://doi.org/10.1007/BF01240652
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DOI: https://doi.org/10.1007/BF01240652