https://planetsave.com/articles/man-vaccinated-against-polio-28-years-ago-has-been-shedding-mutated-highly-virulent-form-the-whole-time-other-mutated-strains-found-in-sewage-samples-the-world-over/ Science, Animals, Planet Earth, & More Sat, 29 Aug 2015 13:18:54 +0000 hourly 1 https://wordpress.org/?v=6.6.2