CTX-M-producing E. coli are a rapidly developing problem in the UK, with CTX-M-15 particularly common. The diversity of producers and geographical scatter of referring laboratories indicates wide dissemination of blaCTX-M genes. Because of the public health implications, including for the treatment of community-acquired urinary tract infections, the spread of these strains--and CTX-M-15 beta-lactamase in particular--merits close monitoring.

Objective To determine whether maternal influenza virus infection in the second and third trimesters of pregnancy results in transplacental transmission of infection, maternal auto-antibody production or an increase in complications of pregnancy.Design Case-control cohort study.Population Study and control cohorts were derived from 3975 women who were consecutively delivered at two Nottingham teaching hospitals between May 1993 and July 1994. A complete set of three sera was available for 1659 women.Paired maternal ante-and postnatal sera were screened for a rise in anti-influenza virus antibody titre by single radial haemolysis and haemagglutination inhibition. Routine obstetric data collected during and after pregnancy were retrieved from the Nottingham obstetric database. Cord samples were tested for the presence of IgM anti-influenza antibodies, and postnatal infant sera were tested for the persistence of influenza-virus specific IgG. Paired antenatal and postnatal sera were tested against a standard range of auto-antigens by immunofluorescence.

A survey was conducted of the antimicrobial susceptibilities of 595 Acinetobacter spp. isolated from routine clinical specimens in 54 sentinel laboratories throughout the UK during 2000. Isolates of the Acinetobacter baumannii complex (genomic groups 2, 3 and 13TU; n = 443) were distinguished from other genomic groups (n = 152) by PCR fingerprinting of tDNA spacer regions. MICs of amikacin, cefotaxime, ceftazidime, ciprofloxacin, colistin, gentamicin, imipenem, meropenem, minocycline, piperacillin, piperacillin/tazobactam, rifampicin, sulbactam and tetracycline were determined on IsoSensitest agar and interpreted, wherever possible, using BSAC breakpoints. Tigecycline (GAR-936), a new glycylcycline, was also tested. Resistance to cephalosporins, aminoglycosides and ciprofloxacin was widespread, but carbapenems, colistin, sulbactam, minocycline and tigecycline were each active against >80% of the isolates. Isolates of A. baumannii were more often resistant to cefotaxime, ceftazidime, piperacillin, piperacillin/tazobactam, ciprofloxacin, gentamicin and tetracyclines than those belonging to other genomic groups, but were less often resistant to colistin; no significant differences between genomic groups were noted in the susceptibilities to amikacin, carbapenems, rifampicin or sulbactam. The relative activities of the tetracyclines were minocycline > tigecycline > tetracycline. Thirteen carbapenem-resistant isolates (MICs > or =8 mg/L; 2.2%) were received from six centres; four centres sent single isolates; one sent three and one sent six. An allele of bla(IMP) was detected in one of these isolates, but the other 12 isolates either had carbapenemase-independent resistance, or undetectable carbapenemase activity combined with other resistance mechanisms. In conclusion, carbapenems, colistin and minocycline retained greatest activity against the Acinetobacter isolates collected. Tigecycline was less active than minocycline, but both agents overcame most tetracycline resistance.

No abstract

The Public Health Laboratory Service receives antibiotic susceptibility data for bacteria from bloodstream infections from most hospitals in England and Wales. These data were used to ascertain resistance trends to ciprofloxacin from 1990 through 1999 for the most prevalent gram-negative agents: Escherichia coli, Klebsiella spp., Enterobacter spp., and Proteus mirabilis. Significant increases in resistance were observed for all four species groups. For E. coli, ciprofloxacin resistance rose from 0.8% in 1990 to 3.7% in 1999 and became widely scattered among reporting hospitals. The prevalence of resistance in Klebsiella spp. rose from 3.5% in 1990, to 9.5% in 1996 and 7.1% in 1999, while that in Enterobacter spp. rose from 2.1% in 1990 to 10.5% in 1996 and 10.9% in 1999. For both Klebsiella and Enterobacter spp., most resistance was localized in a few centers. Resistance was infrequent and scattered in P. mirabilis, but reached a prevalence of 3.3% in 1999.