Influenza Vaccine Suppliers & Bulk Manufacturers

Available Forms: Injection

Available Strengths: -

Reference Brands:

Category: Vaccines

Inactivated influenza vaccine is an inactivated vaccine (made from a dead virus). It helps develop immunity by forming antibodies, which are proteins that protect against infection caused by viruses present in the vaccine.

Product Description:

Inactivated influenza vaccine contains influenza viruses that have been grown, killed and either split or purified into surface antigens, so they cannot replicate but still present haemagglutinin to the immune system. Antibody against haemagglutinin prevents the virus attaching to respiratory cells. Protection takes about two weeks to develop and wanes over months.

The defining feature of influenza vaccine is that it is a different product every year. Influenza viruses drift continuously, and the World Health Organization recommends the strain composition twice a year — once for each hemisphere's season — which manufacturers then produce to. Quadrivalent formulations cover two influenza A and two B lineages; trivalent has returned in some markets after one B lineage stopped circulating. High-dose and adjuvanted formulations exist for older adults, whose response to standard vaccine is weaker.

Sourcing notes. Any enquiry must specify the season and hemisphere, the valency, the production platform — egg-based, cell-based or recombinant — and the presentation, since single-dose prefilled syringes and multi-dose vials differ in price and in thiomersal content. Cold chain at 2 to 8°C, never frozen. Production is annual and capacity is committed early, so late orders cannot be filled.