Author Correction: Age-associated changes in the impact of sex steroids on influenza vaccine responses in males and females

Correction to: npj Vaccines published online 12 July 2019

In the original version of this Article, an incorrect contract number was quoted for the Johns Hopkins Center for Influenza Research and Surveillance, it should have been HHSN272201400007C. This has now been corrected in the PDF and HTML versions of the Article.

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Correspondence to Sabra L. Klein.

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The original article can be found online at

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