Two influenza or flu vaccine syringes are resting on a table of a drugstore in Tehatta, West Bengal, India, on September 13, 2025. The seasonal flu (influenza) vaccine Influvac Tetra is consisting of two type A strains (H1N1 and H3N2) and two type B strains (Victoria and Yamagata). According to the WHO, influenza, or ‘flu,’ is a highly contagious respiratory illness that is spreading easily through the air or when people are touching contaminated surfaces.
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