Yis R, Sait Yildirim M. Changes in seroprevalence and acute infection rates after vaccination and herd immunity in a pediatric hospital in the Southeastern Anatolia region of Turkey: Effects of adding hepatitis a vaccine to the Extended National Immunization Progra. annalsmedres [Internet]. 2021 May 25 [cited 2024 May 18];27(3):0743-8. Available from: http://www.annalsmedres.org/index.php/aomr/article/view/683