Abstract
The ability of inactivated influenza A vaccines to induce serum HI antibody and immunity to challenge infection was studied in hamsters and in volunteers. Groups of hamsters were immunized with 200 IU of influenza virus A/Scotland/74, A/Port Chalmers/73, A/England/72, or A/Hong Kong/68. The serum HI antibody response of animals to, and immunity to challenge infection was directly related to the known relationship between the vaccine and test viruses. Thus, hamsters given A/Hong Kong/68 or A/England/72 vaccine produced serum HI antibody and immunity to A/Hong Kong virus infection, and animals given A/Scotland/74, A/Port Chalmers/73, and A/England/72 produced antibody and immunity to A/Scotland infection.
In a volunteer study, groups of students were immunized with 400 IU of the same vaccines as used above. The ability to infect these volunteers with WRL 105 virus given 4 weeks later was directly related to the vaccine-induced serum HI antibody to the challenge virus. The highest titers of serum HI antibody to A/Scotland virus were found in volunteers inoculated with homologous vaccine, lower titers were found in volunteers given A/Port Chalmers or A/England/ 72 vaccine and the lowest levels were seen in volunteers given A/Hong Kong/68 vaccine: the largest number of infections by the challenge virus was seen in volunteers given A/Hong Kong/68 vaccine, less were observed in volunteers given A/England/72 vaccine, and least were found in groups given A/Port Chalmers or A/Scotland/74 vaccine. Compared with the incidence of infection in volunteers given B/Hong Kong/73 vaccine, all groups given heterologous influenza A vaccines showed some immunity to challenge infection.
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Potter, C.W., Jennings, R. & Nicholson, K. Immunity to influenza virus infection induced by heterologous, inactivated vaccines. Med Microbiol Immunol 166, 99–108 (1978). https://doi.org/10.1007/BF02121139
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DOI: https://doi.org/10.1007/BF02121139