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Humoral response to proFhCatB following vaccination of rats. Animals (n = 8) were injected intramuscularly with 20 μg of proFhCatB protein in the presence of Freund's adjuvant (FA) or Quil A (QA) twice as indicated by the arrows. Blood was taken at 3 weeks postinjection and tested individually for anti-proFhCatB antibody by ELISA using plates coated with 2 μg of proFhCatB per ml.
