The Home Medical Library, Volume 2…
“ Whenever doubt exists as to the nature of the disorder, a microscopic examination of the expectoration or of the mucus from the throat by a competent physician will definitely determine the existence of influenza, if the special germs of that disease are found. It is the prevailing and erroneous fashion for a person to call any cold in the head the grippe; and there are, indeed, many cases in which it becomes difficult for a physician to distinguish between grippe and a severe cold with muscular soreness and fever, except by the microscopic test. ”
