When the illness was first observed, doctors were reluctant even to call it the flu. It seemed to be a new disease, they said. Some called it bronchopneumonia, others called it epidemic respiratory infection. Doctors suggested it might be cholera or typhus, or perhaps it was dengue fever or botulism. Still others said it was simply an unidentified pandemic disease. Those who used the term “influenza” insisted on enclosing it in quotation marks.