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The present form of the grippe is an infectious disease finding its way through the respiratory mucous membrane, and the resulting toxins, by their migrations, tend to induce a lasting lassitude and depression that are characteristic symptoms in many of the cases. The primary cause of this disease is the susceptibility of the system. This is shown by the fact that some persons enjoy entire freedom, while others succumb to its influence every time it appears.
There are many conditions that favor it. What is called a poor circulation is accompanied by an inability to throw off morbific influences, and persons in that condition are likely to suffer from every epidemic. The same applies to indigestion, for when the body is not well nourished there is but feeble reactive force. Those having a torpid liver find the grippe an added burden to the discomfort of life, and those with an
SHEPARD CH. ALCOHOL IN THE GRIPPE.. JAMA. 1895;XXV(13):517-519. doi:10.1001/jama.1895.02430390003001a