A poxvirus antigen associated with pathogenicity for rabbits.

Area of Science:

• Virology
• Molecular Biology
• Genetics

Background:

• Cowpox virus (CPXV) exhibits variants, including white pock variants, which differ in pathogenicity.
• White pock CPXV variants fail to produce a specific precipitating antigen, termed "d" substance.
• Previous research established a link between CPXV variants and antigen production.

Purpose of the Study:

• To investigate the presence of "d" substance in various poxviruses.
• To determine the genetic linkage between "d" substance production and rabbit skin pathogenicity.
• To analyze recombinant poxviruses for antigen production and pathogenicity.

Main Methods:

• Analysis of soluble antigen preparations from rabbitpox virus, vaccinia virus, and variola virus for "d" substance.
• Testing of recombinant poxviruses derived from variola, cowpox, and rabbitpox viruses.
• Comparison of recombinant virus "d" substance production with their previously recorded intradermal effects in rabbits.

Main Results:

• "d" substance was demonstrable in rabbitpox and neurovirulent vaccinia virus antigens, but not in variola virus antigens.
• Recombinant viruses showed specific patterns of "d" substance production.
• Results were correlated with known rabbit skin pathogenicity of these recombinant viruses.

Conclusions:

• Functional genes for "d" substance production and rabbit skin pathogenicity are closely linked on the poxvirus genome.
• While linked, the interdependence of these two functions remains inconclusive.
• This study provides insights into poxvirus genetics and antigen expression.