To the Editor.— Hypokalemia with neuromuscular manifestations has been reported in many clinical situations such as diuretic therapy, laxative abuse, hyperaldosteronism, cortisol excess, Fanconi's syndrome, colonic villous adenoma, and licorice ingestion. It has been seen mainly in white patients and in association with thyrotoxicosis. A recent case occurred in a euthyroid Negro patient.1A letter in theBritish Medical Journal2described hypokalemia in many patients during the English epidemic of influenza A2(1968 Hong Kong strain) but no documentation was presented. We report this case in order to reemphasize this observation and to note its presentation as a form of hypokalemic periodic paralysis. Report of a Case.— A 66-year-old white woman suffered an influenza-like illness one month prior to admission, with chills, fever, muscle-aching, burning of eyes, and cough. She was bedridden for two weeks but began recovery. An epidemic of influenza in her town at this time