Vaccinated man excretes live poliovirus for nearly 3 decades
Strains in immune-compromised Briton differ slightly from vaccine’s
![poliovirus](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2015/08/082615_ss_polio_free.jpg?fit=860%2C460&ssl=1)
CHANGING FACE An immunodeficient man has been excreting live poliovirus for 28 years. His viral strains differ from the one he received in a vaccine. A simulated virus particle shows some of these changes, in surface regions (red) that interact with human immune proteins and elsewhere (blue).
G. DUNN ET AL/PLOS PATHOGENS 2015 (CC BY 4.0)