![]() ![]() However, other domains of HA (like the stem) and other proteins are also able to elicit protective Ab responses. Furthermore, most research has focused on Abs directed to the globular head domain of hemagglutinin (HA). However, the precise protection mechanism provided by these Abs still needs to be established. Antibodies (Abs) are very important in preventing the infection and in blocking virus propagation once the infection has taken place. ![]() The seasonal variation of the virus and the likelihood of periodical pandemics caused by completely new virus strains make it difficult to produce vaccines that efficiently protect against this infection. The influenza A virus infection continues to be a threat to the human population. 4Centro de Investigaciones Sobre Enfermedades Infecciosas, Instituto Nacional de Salud Publica, Cuernavaca, Mexico. ![]()
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