Diphtheria booster advised
In October 2003, a man who had been working in a rural village in Haiti returned to Pennsylvania and was admitted to a hospital with a severe sore throat and respiratory distress. He was diagnosed with respiratory diphtheria and died. The clinical efficacy of the diphtheria vaccine is 97%, but the man had never been immunized.
Diphtheria is contracted by inhaling the bacteria directly from an infected person. It can lead to heart failure, paralysis and coma. Even death can occur in as little as a week; the mortality rate for diphtheria can be as high as 20%.