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Serology results for 116 noncases from whom sera were collected
Of the 39 cases, 31 had a history of smallpox vaccination (see Results).
Twenty-three of 25 of these positive results were considered equivocal, as determined by analysis of the IgM results for the confirmed cases (see Discussion), and 2 of 25 may have been true cases for whom sufficient sample collection was lacking for confirmation based on clinical and epidemiologic data.
