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Sera from patients having syphilis gave positive tests for rheumatoid factor in 11 per cent of 147 cases studied when the F II latex and tanned sheep cell procedures were used. The sensitized sheep cell test was positive, however, in but one serum giving positive results by the F II tests. The factor in syphilis sera responsible for positive rheumatoid reactions was separable from Wasserman antibody.
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Peltier et al. (1959) studied this question.
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