摘要 |
An inactivated influenza virus preparation is described which comprises a haemagglutinin antigen stabilized in the absence of thiomersal, or at low levels of thiomersal, wherein the haemagglutinin is detectable by a SRD assay. The influenza virus preparation may comprise a micelle modifying excipient, for example alpha-tocopherol or a derivative thereof in a sufficient amount to stabilize the haemagglutinin.
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