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Antibody levels in vaccinated and control cats before and after FIPV challenge. Sera collected at the indicated times were tested by ELISA using N protein electrophoretically purified from detergent-disrupted FIPV virions. Arrows indicate vaccine doses. (○) Mean±S.D. of ELISA OD-values in vaccinated cats. (•) Mean±S.D. of ELISA OD-values in control cats.
