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Phages WSa and MSa are serologically distinct. (A) MαMSa antibodies react with the mutant phage MSa but not with the wild phage WSa. The peak of phage WSa coincides with the peak of the negative control. (B) RαWSa antibodies react with the heterologous antigen (phage MSa) more strongly than with the homologous one (phage WSa).
