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Content on this page was developed during the 2009-2010 H1N1 pandemic and has not been updated.

  • The H1N1 virus that caused that pandemic is now a regular human flu virus and continues to circulate seasonally worldwide.
  • The English language content on this website is being archived for historic and reference purposes only.
  • For current, updated information on seasonal flu, including information about H1N1, see the CDC Seasonal Flu website.

Vaccine Information for Clinicians and Health Care Professionals

CDC recommends influenza vaccination as the first and most important step in protecting against the flu.  The 2010-11 seasonal influenza vaccine will provide protection against 2009 H1N1 plus influenza B and influenza H3N2 strains.  However, the 2010-11 seasonal vaccine is usually not available until September or later.  Because sporadic cases of 2009 H1N1 continue to be detected in the United States and 2009 H1N1 viruses are being reported in other parts of the world, CDC continues to encourage vaccination with available doses of monovalent 2009 H1N1 vaccine until the seasonal influenza vaccine becomes available. Getting vaccinated against 2009 H1N1 at this time might be especially important for:

  1. Children 6 months through 8 years of age who have not yet received a 2009 H1N1 vaccine. Getting a dose of 2009 H1N1 vaccine now means they will only need one dose of seasonal vaccine when it becomes available.
  2. People who are traveling to areas where 2009 H1N1 is occurring, and
  3. People who are at higher risk of flu-related complications, but have not yet received a 2009 H1N1 vaccine. This people with lung disease, like asthma or chronic obstructive pulmonary disease (COPD), diabetes, heart, or neurologic disease, and women who are pregnant.

New For the 2010-2011 Influenza Season

ACIP 2009 H1N1 Influenza Vaccine Recommendations

Vaccine Information Statements and Other Free Educational Materials

Questions and Answers

Providing H1N1 Vaccine

FDA Resources

Vaccine Safety and Monitoring

Vaccine Dosage, Administration, and Storage


Pneumococcal Vaccine

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