Herd immunity and primary immune deficiencies
This letter addresses the issues adjoining the article by Bernadou et al. Measles outbreak linked to insufficient vaccination coverage in Nouvelle-Aquitaine Region, France, October 2017 to July 2018. Euro Surveill. 2018;23(30):pii?=?1800373. https://doi.org/10.2807/1560-7917.ES.2018.23.30.1800373.