Outbreak of scarlet fever at a hospital day care centre: Analysis of strain relatedness with phenotypic and genotypic characteristics

被引:19
作者
Hsueh, PR
Teng, LJ
Lee, PI
Yang, PC
Huang, LM
Chang, SC
Lee, CY
Luh, KT
机构
[1] NATL TAIWAN UNIV HOSP,DEPT INTERNAL MED,TAIPEI 100,TAIWAN
[2] NATL TAIWAN UNIV HOSP,DEPT LAB MED,TAIPEI,TAIWAN
[3] NATL TAIWAN UNIV HOSP,DEPT PEDIAT,TAIPEI 10016,TAIWAN
[4] NATL TAIWAN UNIV,SCH MED TECHNOL,TAIPEI 10764,TAIWAN
关键词
outbreak; scarlet fever; antimicrobial susceptibilities; cellular fatty acids; chromatogram; random amplified polymorphic DNA patterns;
D O I
10.1016/S0195-6701(97)90194-8
中图分类号
R1 [预防医学、卫生学];
学科分类号
1004 ; 120402 ;
摘要
An outbreak of scarlet fever involving 12 children occurred at a hospital day care centre from February to March 1996. Twenty-five throat isolates of Streptococcus pyogenes (GAS, group A streptococcus) available from 24 children, including 10 children with scarlet fever and 14 asymptomatic carriers, and one asymptomatic staff member were studied for the presence of genes encoding streptococcal pyrogenic exotoxin types A (speA), B (speB), and C (speC) and for protease activity. Antimicrobial susceptibilities using the E-test, cluster analysis by cellular fatty acid composition and random amplified polymorphic DNA (RAPD) patterns by means of arbitrarily-primed polymerase chain reaction (APPCR) of the isolates were performed to investigate the outbreak. Only one isolate from an asymptomatic child possessed the speA gene. All isolates possessed the speB gene and 24 (96%) isolates were positive for the speC gene. There was no difference in protease activity between isolates from children with scarlet fever and from asymptomatic carriers. Thirteen isolates (10 recovered from children with scarlet fever, two from asymptomatic children, and one from the staff member) were considered to be the same strain according to the identical antimicrobial susceptibility profile and RAPD patterns and were also considered to be similar by cluster analysis of fatty acid composition. These findings suggest that the outbreak was caused by a unique clone of GAS. We conclude that RAPD typing and cluster analysis by cellular fatty acids composition both provide a powerful tool for epidemiological investigation of GAS infections.
引用
收藏
页码:191 / 200
页数:10
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