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- [4] STUDIES ON OPACITY FACTOR PRODUCTION BY PHARYNGEAL ISOLATES OF GROUP-A STREPTOCOCCI JOURNAL OF INFECTIOUS DISEASES, 1976, 134 (02): : 189 - 192
- [5] RELATIONSHIP BETWEEN M-ANTIGEN AND OPACITY FACTOR IN GROUP-A STREPTOCOCCI JOURNAL OF GENERAL MICROBIOLOGY, 1971, 65 (JAN): : 69 - +