Over recent years, pandemic inuenza virus infections have caused concerns about an ever-increasing mobility of populations, especially in air travel. Limiting exposure to fellow travellers who may be suffering from a febrile high temperature has been employed with some success. Pandemic inuenza virus is a virulent human form that causes global outbreak, or pandemic, of serious illness. Because there is little natural immunity, the disease can spread easily from person to person. ere have been pandemic outbreaks in the United States in 1918, 1958, and 1968 with varying degrees of morbidity and virulence. Children under 18 years have tended to have the highest rates of illness, though not of severe disease and death.1