Although an influenza vaccine has been available for 70 years. influenza virus still causes seasonal epidemics and worldwide pandemics. Currently available vaccines elicit strain-specific antibody responses to the surface haemagglutinin (HA) and neuraminidase (NA) proteins. but these can be ineffective against serologically-distinct viral variants and novel subtypes. https://www.unitedssports.shop/product-category/ball-bag-personal/