Frequency of neuraminidase antibody rises to two doses of H1N1-containing vaccine was 10% in unprimed subjects aged <26 years and about 18 to 36% in older persons.
Concentrates of H1N1 virus used to prepare vaccines for clinical investigations performed in the spring of 1978 had neuraminidase activity at that time which decreased during storage to almost undetectable levels (three lots) or by 50% (one lot) by the winter of 1978.
Conventional seasonal influenza vaccines use a trivalent mixture of split viruses, containing two influenza A subtypes (H1N1 and H3N2) and one variant of influenza B virus without the loss of immunogenicity to an individual subtype within the vaccine formulation.
Because it was shown earlier that previous exposure to H3N2 virus did not affect H5-specific ASC responses and the H1 HA and H5 HA share some structural similarity and common epitopes , the effect of the H1N1-mediated priming on the H5N1 ca vaccines was investigated.
H1N1vaccine-induced immunity prevented replication of the H5N1 ca vaccine virus
H1N1vaccine primes faster B cell responses to the H5N1 vaccine than the H3N2 vaccinated animals
H1N1 ca vaccine-induced faster B cell responses to the H5N1 vaccine virus is due to the H1 HA
However, despite restricted replication of the H5N1 ca virus in the upper respiratory tract of the H1N1 exposed ferrets, the level of H5N1-specific neutralizing antibodies in the animals that previously received the H1N1 ca vaccine was similar to the seronegative animals.
Our observation of protection across substantial sequence divergence means that H5-derived vaccines might also protect against circulating H1N1 and H3N2 subtypes.
This conference report highlights selected presentations on the response to the H1N1 influenza pandemic, future strategies for combating pandemic influenza, and the role of novel vaccine technology in the pandemic response.
To identify immunological predictors of resistance to influenza A infection and illness, the immunological status of live and inactivated virus vaccines subsequently challenged with H1N1 or H3N2 wild-type virus was examined.
Administration to children of the bivalent vaccine containing H1N1 and H3N2 recombinants induced efficient production of antibody to H1 and H3 hemagglutinins and N1 and N2 neuraminidases without adverse reactions.
During the first wave, people under the age of 20 were almost exclusively infected () and they also had a marked lower immune response to inactivated vaccines containing H1N1, suggesting that they did not have any immunological memory against this virus ().
We demonstrate that mice immunized with inactivated vaccines based on human H1N1 virus from 1918 to 1943 or based on classical swine H1N1 viruses confer complete protection from death against a lethal challenge with the 2009 H1N1 virus.
Nevertheless, these results indicate that inactivated vaccines based on classical swine H1N1 viruses and on human 1918 and 1943 H1N1 viruses protect against death in mice infected with the 2009 pandemic H1N1 virus and suggest that they likely share significant antigenic similarity.
Using a panel of 11 different influenza viruses from 1918–2009, we tested the ability of inactivated vaccines based on these viruses to protect against a mouse-lethal 2009 pandemic H1N1.
Therefore, a vaccine based upon an inactivated A/NJ/76 (H1N1) virus was developed and administered to nearly 40 million people in the United States.
Grippovac SE-AZh a polytype, subunit influenza virus vaccine containing H1N1 and H3N2 influenza A virus strains and one influenza B virus strain has been tested in 80 volunteers.
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