Centers included in the study, periods of isolation of CTX-M-3-producing organisms, and numbers of isolates recovered in particular institutions

CenteraLocationType of centerTime of collection (mo.yr)No. of isolates
TotalK. pneumoniaeK. oxytocaE. coliE. cloacaeC. freundiiS. marcescensM. morganii
BBBielsko-BiałaSecondary hospital11.99–04.0010523
CZCzȩstochowaSecondary hospital09.99–01.001481113
GDGdańskSecondary hospital04.9811
KAKartuzyPrimary hospital04.9811
KRCracowTertiary teaching hospital03.98–05.98211
SUSuwałkiSecondary hospital08.99–03.0012741
SZSzczecinTertiary teaching hospital03.98–06.98541
WA IWarsawTertiary specialist hospital09.98–10.98911241
WA IIWarsawTertiary specialist hospital10.992c2
WA IIIWarsawTertiary specialist hospital10.99–04.00321
WA IVWarsawOutpatients clinicb11.99–02.003111
WA VWarsawTertiary teaching hospital03.98–05.9871231
WA VIWarsawTertiary specialist hospital03.98–05.9822
WOWołominPrimary hospital10.99–06.008311111
WRWrocławTertiary teaching hospital03.98–05.9851112
  • a Tertiary specialist hospitals WA I, WA II, WA III, and WA VI are reference centers that specialize in hematology, oncology, rheumatology, and pediatrics, respectively.

  • b Isolates identified in the outpatient clinic of WA IV were collected from patients who had been hospitalized shortly before strain identification.

  • c Two K. pneumoniae isolates were collected from the same patient.