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. 1996 Apr;64(4):1166–1172. doi: 10.1128/iai.64.4.1166-1172.1996

Antigen recognition during progression from acute to chronic infection with a cagA-positive strain of Helicobacter pylori.

H M Mitchell 1, S L Hazell 1, T Kolesnikow 1, J Mitchell 1, D Frommer 1
PMCID: PMC173899  PMID: 8606074

Abstract

We have previously published two reports on acute infection with Helicobacter pylori, one of an adult male and one of a family of four. In the present study, we have isolated H.pylori from each of twin boys in the family and compared these by use of random amplified polymorphic DNA PCR. In addition, we have monitored the antibody response over time of the family and the adult male by Western blotting (immunoblotting) with two different strains of H. pylori as the antigen and by use of a commercial kit. The acutely infected twin boys were infected by an identical strain of H. pylori. The twin boys responded to antigens of 19, 26.5, and 29 kDa 30 days after the initial diagnosis, with recognition of 43-to 49-, 66-, 69-, and 87-kDa antigens by day 63. One twin responded to the CagA antigen on day 63, whereas the other responded on day 857. Antibody to the CagA antigen was not detected by use of the infecting strain, UNSW-RU1. Investigation of UNSW-RU1 revealed the presence of cagA. In two acutely infected adults (one, the father of the boys), the initial response to a 45-kDA antigen was later followed by responses to 19-, 29-, 49-, 60-, 77-, and 84-kDa antigens. Sera from the twins' younger sister, born 17 months after the twins acute episode, indicated that she also had become infected. This report supports intrafamilial transmission of H. pylori. Initial antibody responses in the children were to small-molecular-size antigens; in the adults, the initial responses were to larger-molecular-size antigens. The pattern of the serological response differs according to the antigen used. This has implications in regard to international data comparisons.

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Selected References

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