Epidemiological Study on Beta-hemolytic Streptococcal Infections in Yamagata Prefecture

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  • SAKANO SATOJI
    Department of Bacteriology, Tohoku University School of Medicine

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Epidemiological and bacteriological survey of streptococcal infections in a rural prefecture, Yamagata, has been continued for 15 years. After the World War II, cases of acute nephritis were detected from 1955 to 1957, and these infections yielded the isolation of group C streptococci. The outbreak of scarlet fever in 1959 was caused by types 1 and 6 of group A streptococci. Thereafter, from the outbreaks of pharyngitis and nephritis, either type 6, or 12, or 22 group A streptococcus was isolated as a causative agent.<br> One year survey made recently on the correlation of the clinical pictures with the isolated streptococcus strains revealed that the clinical manifestations of the children under 10 years old, att older school age, and of the adults were in the form of acute pharyngitis, catarrhal tonsillitis and parulent tonsillitis, respectively. These were infections due to types 12 and 22. Variation of types of group A streptococcus in these 15 years in Yamagata Prefecture was discussed on the basis of nation-wide isolation results of streptococci

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