Ramani Dhanasekran, Akilan, Ashok Periasamy, Karthikeyan Balakrishnan, and Kulasekar Chandran. “Increase in Cases of Diphtheria in Europe Among Asylum-Seekers”. Global Biosecurity 5, no. 1 (February 20, 2023). Accessed December 21, 2025. https://jglobalbiosecurity.com/index.php/up-j-gb/article/view/184.