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Number of H1N1 vaccinations, since October 2009

Codes and Frequencies

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For sample children who had an H1N1 flu vaccination, VACH1N1NO indicates whether the child had 1 dose of the vaccine, or at least 2 doses of the vaccine.

The survey question associated with VACH1N1NO was removed from the NHIS in August 2010. At that time, it was replaced with VACFLUNUM. This replacement variable identifies the number of flu vaccines received in the past year, regardless of whether the vaccine was for H1N1 flu or seasonal flu.

VACH1N1NO is part of a series of variables in 2010 dealing with immunization. For other related variables, please use the IPUMS NHIS search function and drop-down menus.


There are no comparability issues.


  • 2010: Sample children under 18 in quarters 1 and 2 and the first several weeks of quarter 3 who have had an H1N1 vaccine dose.


  • 2010