Public health responses to the 2009 H1N1 pandemic included widespread vaccination campaigns, antiviral distribution, public health messaging, and travel advisories. Governments and health agencies worked to rapidly develop and distribute an H1N1 vaccine, which became available in the fall of 2009. The Centers for Disease Control and Prevention (CDC) and WHO played crucial roles in coordinating the global response, providing guidance on prevention and treatment, and monitoring the spread and evolution of the virus.
