When a parent chooses not to vaccinate their child, they put many other people at risk. Some infants cannot be vaccinated due to medical complications, and even fully-vaccinated people are not always fully protected. Jessica Parsons tells the story of baby Finn on Aetiology, who was diagnosed with Ewing’s Sarcoma at the age of 3 months and has been undergoing chemotherapy, surgery, and blood transfusions ever since. Because he was immunosuppressed, Finn could not be vaccinated, and despite responding well to cancer treatments, his life was imperiled by a case of whooping cough. Meanwhile, on ERV, Abbie Smith explains that vaccination against measles does not guarantee that you will not contract and even transmit the disease. But 87% of measles infections in 2011 in the U.S. occurred in unvaccinated individuals. These are the people keeping antiquated pathogens in circulation, endangering the lives and well-being of others.