Results further showed that healthy individuals vaccinated the year before showed higher baseline GMT for the A/H3N2 strain than unvaccinated health controls. In the MTX group, higher baseline antibodies were noted for the seasonal A/H1N1 and B strains in previously vaccinated patients compared with unvaccinated subjects. For the Rituximab group, patients previously vaccinated not only had a higher baseline GMT, but also a higher post-vaccination GMT for the seasonal A/H1N1 than patients who were not vaccinated the prior year.

The safety of the flu vaccine was also tested by researchers and found to be safe. There were no differences noted between the 3 groups in the occurrence of side effects from the vaccination. Researchers determined that RA activity was not influenced by the flu vaccine and used the disease activity (DAS28) score prior to vaccination and at 7 and 28 post-vaccination to assess RA activity in patients in the MTX and rituximab groups.

"Individuals who have compromised immune systems, such as with RA, are at risk for complications from contracting the flu virus," said Dr. van Assen. "We recommend yearly influenza vaccination for all RA patients and preemptive vaccination for flu should be considered by those patients who start rituximab treatment."

Source: Wiley-Blackwell