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Sera of young roof rats and cotton rats born of mothers with high complement-fixing titers for murine typhus fever displayed low grade and diminishing titers of these antibodies for about two months. The presence of transient complement-fixing antibodies in offspring of rats immune to murine typhus might introduce a source of error in complement fixation surveys of this disease in rat populations.
1 This study was conducted by the International Health Division of The Rockefeller Foundation and the Florida State Board of Health.
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