Publications

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in situ survival of plasmid-bearing and plasmidless pseudomonas aeruginosa in pristine tropical waters.two rare wild-type strains of pseudomonas aeruginosa were mixed in membrane diffusion chambers and then introduced into a natural freshwater environment for 72 h. the plasmid-containing strain (r serotype 15) and the plasmidless strain (h serotype 5) had initial bacterial densities of 2 x 10(5) cells per ml. samples collected from the chambers were analyzed for viable and direct counts and for acquired-resistance frequencies. suspected transconjugant-to-donor ratios ranged from 0.5 to 1.3; trans ...19883144245
multicenter evaluation of the in vitro activity of six broad-spectrum beta-lactam antimicrobial agents in puerto rico. the puerto rico antimicrobial resistance study group.the minimum inhibitory concentrations of 6 broad-spectrum beta-lactam antimicrobial agents were determined by use of the etest versus a total of 569 bacteria in 7 puerto rican hospital laboratories. these included 342 recent clinical isolates of enterobacteriaceae, 63 pseudomonas aeruginosa, 54 acinetobacter species, and 110 oxacillin-susceptible staphylococci. extended spectrum beta-lactamase production was noted among 11% of klebsiella pneumoniae isolates. hyperproduction of amp c cephalospori ...19989554179
enterobacter cloacae and pseudomonas aeruginosa polymicrobial bloodstream infections traced to extrinsic contamination of a dextrose multidose vial.to identify risk factors for polymicrobial bloodstream infections (bsis) in neonatal intensive care unit (nicu) patients during an outbreak of bsis.19989821421
a comparison of the antimicrobial resistance patterns of gram-negative bacilli isolated from community-private and university-affiliated hospitals from puerto rico.few studies have been performed in puerto rico concerning the antimicrobial resistance pattern of clinically significant gram-negative bacilli. the antimicrobial resistance patterns of 5,590 gram-negative bacteria obtained from three community-private hospitals (cph) and three university-affiliated hospitals (uah) were evaluated utilizing the institutions' antimicrobial susceptibility reports for the year 2000. the objectives of this study were: to retrospectively evaluate the reported in vitro ...200314619453
antimicrobial resistance in 11 hospitals in puerto rico: results of an antimicrobial resistance management (arm) program.the antimicrobial resistance management program (armp) was established in 1997 at the university of florida as an ongoing project to document trends in antimicrobial susceptibility patterns in inpatient/outpatient isolates and track resistance that may occur with specific antibiotic use.200718035809
detection of kpc in acinetobacter spp. in puerto rico.during an island-wide pcr-based surveillance study of beta-lactam resistance in multidrug-resistant (mdr) escherichia coli, klebsiella pneumoniae, pseudomonas aeruginosa, and acinetobacter calcoaceticus-baumannii complex isolates obtained from 17 different hospitals, 10 kpc-positive acinetobacter isolates were identified. dna sequencing of the bla(kpc) gene identified kpc-2, -3, and -4 and a novel variant, kpc-10. this is the first report of a kpc-type beta-lactamase identified in acinetobacter ...201020038618
detection of the kpc gene in escherichia coli, klebsiella pneumoniae, pseudomonas aeruginosa, and acinetobacter baumannii during a pcr-based nosocomial surveillance study in puerto rico.a 6-month, pcr-based, island-wide hospital surveillance study of beta-lactam resistance in escherichia coli, klebsiella pneumoniae, pseudomonas aeruginosa, and acinetobacter baumannii was conducted in puerto rico. of 10,507 isolates, 1,239 (12%) unique, multi-beta-lactam-resistant isolates from all geographical regions were identified. the kpc gene was detected in 61 e. coli, 333 k. pneumoniae, 99 p. aeruginosa, and 41 a. baumannii isolates, indicating the widespread dissemination of the kpc gen ...201121444702
microbial regulation in gorgonian corals.gorgonian corals possess many novel natural products that could potentially mediate coral-bacterial interactions. since many bacteria use quorum sensing (qs) signals to facilitate colonization of host organisms, regulation of prokaryotic cell-to-cell communication may represent an important bacterial control mechanism. in the present study, we examined extracts of twelve species of caribbean gorgonian corals, for mechanisms that regulate microbial colonization, such as antibacterial activity and ...201222822369
genetic environment of the kpc gene in acinetobacter baumannii st2 clone from puerto rico and genomic insights into its drug resistance.carbapenems are considered the last-resort antibiotics to treat infections caused by multidrug-resistant gram-negative bacilli. the klebsiella pneumoniae carbapenemase (kpc) enzyme hydrolyses β-lactam antibiotics including the carbapenems. kpc has been detected worldwide in enterobacteriaceae and pseudomonas aeruginosa isolates associated with transposon tn4401 commonly located in plasmids. acinetobacter baumannii has become an important multidrug-resistant nosocomial pathogen. kpc-producing a. ...201627259867
isecp1-mediated transposition of blakpc into the chromosome of a clinical isolate of acinetobacter baumannii from puerto rico.carbapenems are the last-resort antibiotics for the treatment of infections caused by multidrug-resistant gram-negative bacilli. klebsiella pneumoniae carbapenemase (kpc) hydrolyses β-lactam antibiotics including the carbapenems. kpcs have been detected in enterobacteriaceae and pseudomonas aeruginosa isolates worldwide associated with transposon tn4401 commonly located in plasmids. acinetobacter baumannii has become an important multidrug-resistant nosocomial pathogen capable of hydrolysing the ...201425246647
activities of carbapenem and comparator agents against contemporary us pseudomonas aeruginosa isolates from the capital surveillance program.antimicrobial susceptibilities of contemporary pseudomonas aeruginosa clinical isolates were determined from the capital 2010 surveillance program. isolates were collected from 100 sites throughout the usa and puerto rico, and included isolates representing a range of patient demographics and infection types. a total of 2722 isolates were tested for susceptibility to a broad spectrum of agents, with susceptibilities ranging from 98.8% for colistin to 74% for levofloxacin. doripenem was the most ...201323391609
two novel class i integron arrays containing imp-18 metallo-β-lactamase gene in pseudomonas aeruginosa clinical isolates from puerto rico.during a β-lactam resistance surveillance study, 12 imp-18-positive pseudomonas aeruginosa isolates belonging to 9 different pulsed-field gel electrophoresis groups were identified. in nine isolates, a class i integron with a novel gene array was identified that contained bla(imp-18) and bla(oxa-224), while in two isolates the class i integron contained bla(imp-18) and bla(oxa-2) but in a new arrangement. our findings show the dissemination of two novel class i integrons in p. aeruginosa from di ...201222290962
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