During the chill or rigor there may be chattering of the teeth, and this usually augurs a severe attack. In one of my cases incessant and prolonged chattering occurred without the presence of a chill or general rigor, but this is rare.
A man, aged 65, was awakened at midnight with uncontrollable chattering of the teeth. I saw him within an hour and found him in a great state of nervous excitement and alarm. His subjective symptoms were a feeling of uneasiness and an indefinite dread of impending evil. The skin was pale, pinched and cool; pulse 96, respirations 20, and temperature 99 degrees. He was restless, tossed about in bed, passed his urine frequently, and his teeth chattered incessantly and uncontrollably. This latter continued for more than two hours, subsiding gradually. Although the skin was cool, yet there was neither chilliness nor rigors. The ordinary symptoms of
WELLS EF. PNEUMONIC FEVER—ITS SYMPTOMATOLOGY.. JAMA. 1894;XXII(16):565-572. doi:10.1001/jama.1894.02420950001001