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Emerging cases of pertussis among early infants born to unvaccinated mothers, an infectious disease long absent in Northwestern Greece. Mediterr J Hematol Infect Dis [Internet]. 2017 Jun. 20 [cited 2026 Apr. 23];9(1):e2017043. Available from: https://www.mjhid.org/mjhid/article/view/2017.043