CDC: Flu vaccine recommendations broaden for pregnant women and children

Pregnant women may receive any licensed, recommended influenza vaccine at any time during pregnancy, according to new recommendations from the Centers for Disease Control and Prevention.

This change from the CDC’s previous guidance that pregnant women receive a seasonal inactivated influenza vaccine (IIV) was recommended by the Advisory Committee on Immunization Practices after some heated debate among committee members over evidence presented to support the change in wording (MMWR. 2017 Aug 25;66[(RR-2]:1-20).

The new update gives women the ability to choose between receiving an IIV and FluBlok, a recombinant influenza vaccine (RIV) that is not egg based and can be manufactured more quickly, making it ideal in cases of pandemic or supply shortages, according to the CDC.

Although pregnant women may choose to receive a vaccination during the first trimester, the CDC warns there may be some risk involved.

“Although experience with the use of IIVs is substantial, and data from observational studies are available to support the safety of these vaccines in pregnancy, data are more limited for vaccination during the first trimester,” according to the CDC. “Moreover, there is substantially less experience with more recently licensed IIV products (e.g., quadrivalent, cell culture-based, and adjuvanted vaccines) during pregnancy in general.”

Data also are limited regarding RIVs, the CDC said, with the data used to determine safety among pregnant women “limited to reports of pregnancies occurring incidentally during clinical trials, Vaccine Adverse Event Reporting System (VAERS) reports, and pregnancy registry reports.”

Changes for children

The CDC chose to accept ACIP recommendations regarding Afluria (IIV3), expanding the age of children who can receive the vaccine from 9 years and older to 5 years and older.

Similar labeling changes were accepted for FluLaval Quadrivalent (IIV4), which had previously been given to children 3 years and older but now but will be available for children starting at 6 months of age.

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New products

Recent product licensures included in the MMWR report are Afluria Quadrivalent (IIV4) and Flublok Quadrivalent (RIV4), both for persons over 18 years.

According to the CDC, Flublok Quadrivalent (an RIV) met noninferiority measures, compared with a similar IIV quadrivalent vaccine, for the A(H3H2) and B/Yamagata viruses but not for A(H1N1) or B/Victoria viruses.

Vaccine composition for 2017-2018

Approved viruses for the 2017-2018 season trivalent vaccines are an A/Michigan/45/2015 (H1N1) pdm09–like virus, an A/Hong Kong/4801/2014 (H3N2)-like virus, and a B/Brisbane/60/2008–like virus (Victoria lineage), according to the MMWR. Quadrivalent vaccines will include those viruses, with the addition of an B/Phuket/3073/2013–like virus (Yamagata lineage).

The CDC continues to recommend that the quadrivalent live attenuated influenza vaccine FluMist not be used by anyone for the 2017-2018 season, a decision that was made after evidence showed poor effectiveness against influenza A(H1N1)pdm09 viruses in the 2013-2014 and 2015-2016 seasons.

Vaccine updates published in this report were recommended by ACIP during meetings held in October 2016 and February and June 2017.

ezimmerman@frontlinemedcom.com

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