Summary
The characteristics of CHAT attenuated poliovirus grown in the WI-26 strain of human diploid fibroblasts were compared with the virus strains isolated from the feces of children who had received this vaccine.
Only type 1 strains were found. Only 1 out of 32 of these strains isolated 1–5 weeks after vaccination showed a partial increase in capacity to replicate at 40° (rct/40 intermediate). Eight of 158 fecal isolates showed some increase in replication at 39° (rct/39 intermediate).
Testing with strain-specific antiserum prepared by immunizing rabbits with CHAT virus disclosed loss of antigenic identity in isolates from 4 out of 5 children after 4 weeks but not after 1 week of intestinal multiplication of the vaccine.
A bovine serum that specifically inhibited plaque formation with the CHAT virus, yet did not affect any of 26 other type 1 strains — either attenuated or virulent — proved to be a genetically stable marker of the virus. Thirty-two of 33 fecal isolates were identified as the CHAT strain with this inhibitor.
Dextran sulfate did not inhibit plaque formation with the CHAT virus in contrast to its inhibitory effect on LSc2ab virus. The nonsensitive character of CHAT to dextran sulfate was unchanged in the 11 strains of CHAT virus derived by a single human passage of the vaccine.
The mean titer of CHAT virus measured in primary human tissue culture was log10 2.09 PFU less than the titer as measured in primary MKTC. Despite preparation of the vaccine in HDCS instead of in MKTC this property of CHAT, designated theH marker, was retained.
Our findings point to a high degree of genetic stability of the CHAT vaccine cultivated in HDCS.
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Presented, in part, before the American Society of Immunologists, April, 1963.
Associate Member of the Wistar Institute and Associate in Medicine, The University of Pennsylvania, School of Medicine.
Supported by grant AI-01799-06 from the National Institute of Allergy and Infectious Diseases, United States Public Health Service.
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Pagano, J.S., Böttiger, M. Studies of the vaccine virus isolated during a trial with an attenuated poliovirus vaccine prepared in a human diploid cell strain, including use of a strain-specific bovine serum inhibitor. Archiv f Virusforschung 15, 19–34 (1964). https://doi.org/10.1007/BF01241418
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DOI: https://doi.org/10.1007/BF01241418