Abstract:
:Enteroaggregative Escherichia coli (EAggEC) are emerging enteropathogens associated with human diarrhea diseases and food poisoning cases. They show distinctive aggregative pattern of adherence to cultured human epithelial cells. However, EAggEC strains are diverse and not all of them have the aggregative adherence fimbria I (AAF/I), AAF/II and heat-stable enterotoxin 1 (EAST1) genes. We attempted to determine the incidence of EAggEC in E. coli isolates from diarrhea patients in Taiwan and to characterize these EAggEC strains. We used three activity assays including HeLa cell adhesion, human blood hemagglutination and bacterial clumping tests and polymerase chain reaction (PCR) primers designed from an aggregative adherence pattern associated plasmid (pCVD432) to screen the EAggEC strains in 403 E. coli isolates including 63 laboratory isolates and 340 clinical isolates obtained from diarrheal disease cases. All these 403 E. coli strains were also assayed with novel PCR primers designed from AAF/I (aggA), AAF/II (aafA) and EAST1 (astA) genes. Results showed that except for the three EAggEC reference strains, only three clinical isolates were identified as EAggEC strains. Including the reference strains, all the E. coli strains with EAggEC activity generated positive PCR results to the aggA gene based primers, but not to the aafA and astA gene targeted primers.
journal_name
Diagn Microbiol Infect Disjournal_title
Diagnostic microbiology and infectious diseaseauthors
Tsai CC,Chen SY,Tsen HYdoi
10.1016/s0732-8893(03)00043-9subject
Has Abstractpub_date
2003-07-01 00:00:00pages
159-65issue
3eissn
0732-8893issn
1879-0070pii
S0732889303000439journal_volume
46pub_type
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