[The influence of acidity on Escherichia coli O157 strains isolated from surface water and clinical material].
E. coli O157 strains isolated from surface water and from a sick human were tested for their ability to survive in environment with pH < or = 7. Examinations were carried on TSB broth with pH range < or = 7 (modified with 1 M HCl) in temperatures 5 degrees C, 25 degrees C, 36 degrees C after 5 hours and 24 hours. It was shown that some of E. coli O157 strains have the survival ability in acid medium pH = 2 and 3 within 5 h in temperatures 5 degrees C, 25 degrees C, 36 degrees C. E. coli O157 strain, of human origin, grows at pH > 4 in temp. 25 degrees C and strain E. coli O157 from water at pH = 4 in this temperature. The acid tolerance of E. coli O157 suggested that the strain be came pathogenic for humans.
Michalska-Szymaszek
Małgorzata
M
Wojewódzka Stacja Sanitamrno-Epidemiologiczna w Rzeszowie, Oddział Laboratoryjny w Tarnobrzegu. gogo29@wp.pl
D001681:Biological Assay; D015169:Colony Count, Microbial / Q000379:methods; D004784:Environmental Monitoring / Q000379:methods*; D004787:Environmental Pollution / Q000032:analysis; D004927:Escherichia coli Infections / Q000517:prevention & control; D019453:Escherichia coli O157 / Q000302:isolation & purification*; D005618:Fresh Water / Q000737:chemistry*; D006801:Humans; D006863:Hydrogen-Ion Concentration; D011044:Poland; D013696:Temperature; D014871:Water Microbiology; D014873:Water Pollutants / Q000302:isolation & purification*
D014873:Water Pollutants