It may be expected that the most common untoward reactions will be related to sensitivity. They are more likely to occur in individuals who have previously demonstrated hypersensitivity to penicillins and cephalosporins and in those with a history of allergy, asthma, hay fever, or urticaria. All degrees of hypersensitivity, including fatal anaphylaxis, have been reported with penicillin. (See Table 2.)
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