Pfizer Animal Health has received USDA approval for a killed virus swine influenza vaccine to help protect pigs from the pandemic H1N1 strain of swine influenza virus. The vaccine is approved  for vaccination of healthy swine, including pregnant sows and gilts, three weeks of age or older against SIV subtype H1N1.

Pfizer became the first U.S. biologics manufacturer to receive a USDA conditional license for this new vaccine.   Earlier this year, the USDA provided a master seed of the pH1N1 strain to multiple manufacturers in anticipation of potential transmission in swine herds.   Producers today have not detected widespread transmission of the pH1N1 strain within swine herds.

“This gives us hope that this pH1N1 strain can be managed by producers like any other seasonal swine flu strain in pigs,” said Gloria Basse, senior director of the U.S. swine business for Pfizer.  Producers are advised to consult their veterinarian on the use of this new conditionally-licensed vaccine, as well as continue to follow American Association of Swine Veterinarians and National Pork Board recommendations for routine flu preventive measures. 

An adequate inventory of this new vaccine is available to ensure supply in key pork-producing states, according to the company.  Local use of the new pH1N1 vaccine requires the approval of state veterinarians and Pfizer is working to achieve state-by-state approvals. 

“Our new conditionally-licensed pH1N1 vaccine adds another valuable swine influenza management tool to Pfizer Animal Health’s FluSure XP Defense System toolbox,” said Steve Sornsen, DVM, director of veterinary services for Pfizer. “This new vaccine was developed from the USDA master seed virus and helps protect pigs against current pH1N1 strains circulating in humans and pigs. Serologic studies in pigs vaccinated with this vaccine showed an increase in antibody titers against the pandemic H1N1 strain.”

The new vaccine is a freeze-dried preparation containing the A/California/04/2009 (H1N1) isolate and requires a 2-mL dose and a booster after three weeks. The new vaccine is available in 50-dose and 250-dose sizes.

It also contains Amphigen to help stimulate immune responses. For more information about this new vaccine, producers should ask their veterinarian or visit

Source: Pfizer Animal Health