Add TN to the list of states that now have an active case of measles …. Texas still has the most cases. So, the questions for this morning Am I protected against measles? Do I ever need a booster vaccine? if you were born after 1957 will one dose of measles vaccine be sufficient to be considered protected from measles. If you answered yes to each question, you are correct. But the question we have for Dr Chris smith Director, School of Nursing from the UTC, why the outbreak….and we know Measles is a nasty virus. But what exactly is it and why is it deadly