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Volume 7, Number 3—June 2001
Dispatch

Expanding Drug Resistance through Integron Acquisition by IncFI Plasmids of Salmonella enterica Typhimurium

Alessandra Carattoli*Comments to Author , Laura Villa*, Cristina Pezzella*, Eugenio Bordi†, and Paolo Visca†‡
Author affiliations: *Istituto Superiore di Sanità, Rome, Italy; †National Institute for Infectious Diseases Lazzaro Spallanzani, Rome, Italy; ‡Università di Roma Tre, Rome, Italy

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Table

Designation and relevant characteristics of representative IncFI plasmids used for genetic analysis of integrons

No. Plasmid Host strain Origin, yeara Resistance patternb Trac kb Ref.
1 IncFI/97 ST 366 Albania, 1997 Ap Cm Sm Sp Su Tc Hg Km Tp + 120 7
2 NTP101 ST DT 208 England, 1974 Ap Cm Sm Sp Su Tc Hg - 135 3
3 pZM3 SW 20 Algeria, 1970 Ap Cm Sm Sp Su Tc Hg Km + 165 10
4 TP181 ST DT 208 Iran, 1975 Ap Cm Sm Sp Su Tc Hg Km + 165 3
5 pZM111 SW WZM111 Italy, 1978 Ap Cm Hg Km Gm + 130 5
6 PZM61 SW WZM6 Italy, 1974 Ap Cm Tc Hg Km - 145 11

a Year of isolation.
b Abbreviations: Ap = ampicillin; Cm = chloramphenicol; Sm = streptomycin; Sp = spectinomycin; Su = sulfonamides; Tc = tetracycline; Hg = mercuric ions; Km = kanamycin; Tp = trimethoprim; Gm = gentamicin.
cAutotransferring properties.

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