Clinical Features of Types A and B Food-borne Botulism

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Abstract
Medical records of 55 patients with type A and type B food-borne botulism reported to the Centers for Disease Control during 2 yr were reviewed to assess the clinical features and severity of illness, diagnostic test results, nature of complications and causes of death. Some patients had features not usually associated with botulism including paresthesia (14%), asymmetric extremity weakness (17%), asymmetric ptosis (8%), slightly elevated CSF protein values (14%), and positive responses to edrophonium chloride (26%). Several observations suggest that type A was more severe than type B disease. Although the case-fatality ratio was not significantly greater, patients with type A disease saw a physician earlier in the course of illness, were more likely to need ventilatory support and were hospitalized longer. Patients who died were older than those who survived. Deaths within the first 2 wk resulted from failure to recognize the severity of the disease or from pulmonary or systemic infection; the 3 late deaths were related to respirator malfunction.
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