R Factors Present in Epidemic Strains of Shigella and Salmonella Species Found in Mexico

  • Jorge Olarte


The appearance of Shigella flexneri resistant to common antibiotics (tetracycline, chloramphenicol and streptomycin) was detected in Mexico as early as 1955 (1,2). of particular importance was the clinical failure observed in the treatment with tetracycline of children with acute dysentery caused by strains of S. flexneri resistant in vitro to this antibiotic. After the discovery of R plasmids in Japan, we tested our culture collection of Shigella, Salmonella and Escherichia coli, including strains which were isolated between the years 1955 and 1969, and found that a large proportion of the resistances observed in these cultures was transmisible to E. coli K-12 (3).


Resistant Strain Mexico City Typhoid Fever Phage Type Shigella Flexneri 
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Copyright information

© Springer Science+Business Media New York 1981

Authors and Affiliations

  • Jorge Olarte
    • 1
  1. 1.Laboratorio de BacteriologiaIntestinal Hospital Infantil de MexicoMexico 7Mexico

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