Abstract
The development of the avidity of 19S and 7S neutralizing antibodies was studied after the immunization of young rabbits with ΦX 174 bacteriophage. Both 19S and 7S antibodies formed during the entire course of the immunization process were able to neutralize bacteriophage ΦX 174 without the participation of thermolabile serum components: neither heat inactivation at 56°C nor addition of piglet complement into the neutralizing system influenced the titer in the neutralization test. In both immunoglobulin classes (IgM and IgG) the first antibodies formed possessed a low avidity that increased in the course of the immunization process so that in the secondary response antibodies of both 19S and 7S type were formed possessing a high binding activity towards the specific antigen. Following the immunization with a high dose of the phage antigen (1010 PFU of ΦX 174 phage) 19S antibodies were formed at a relatively fast rate, the avidity of which did not further increase during immunization. When a low antigen dose was used for immunization the avidity of antibodies significantly increased in the course of immunization.
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Hájek, P. Neutralization of bacterial viruses by antibodies of young animals. Folia Microbiol 15, 9–16 (1970). https://doi.org/10.1007/BF02867042
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DOI: https://doi.org/10.1007/BF02867042