April 2019: ‘Leaky’ Vaccines Can Produce Stronger Versions of Viruses
https://www.healthline.com/health-news/leaky-vaccines-can-produce-stronger-versions-of-viruses-072715?fbclid=IwAR04NtZwzEF9R6xYEdaJ7OWbe4s6oMqLKcz-LjQtopoCyPbHdyOZuRrz5Is
Imperfect Vaccination Can Enhance the Transmission of Highly Virulent Pathogens
https://journals.plos.org/plosbiology/article?id=10.1371/journal.pbio.1002198