'The discovery that antibodies are not required for protection against infection, while counterintuitive, is not novel. In fact, not only are antibodies not required for immunity, in some cases high levels are found in the presence of active, even lethal infections. For example, high serum levels of antibodies against tetanus have been observed failing to confer protection against the disease. A report from 1992 published in the journal Neurology found severe tetanus in immunized patients with high anti-tetanus titers, one of whom died as a result of the infection'
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