Of the case-patients who traveled abroad, for which strain resistance was available, 40.3% (67/166) had a strain resistant to ciprofloxacin, compared with 27.0% (294/1,090) of case-patients who did not travel abroad (p<10-3).
To understand the degree of genetic complexity of ammonium resistance, we mated K12, the strain resistant to ammonium toxicity, to the FY4 laboratory strain, which is unable to grow under conditions of ammonium toxicity.
We have documented that almost half of the strains are also resistant to carbapenems and, as published by other Authors [ 55], also colistin has not escaped development of resistance: in fact, we isolated one strain resistant to this drug.
A house fly strain resistant to permethrin, for instance, also developed cross-resistance to different insecticides within and outside the pyrethroid group, with resistance to beta-cypermethrin, cypermethrin, deltamethrin, propoxur, and fipronil all mediated at least in part by P450 detoxification55.
However among the five strains for which the detailed antibiotic resistance profile was determined, BurA1 constitutes the only strain resistant to tobramycin without carrying aac(6′ -iz in its genome.
The strain resistant to combinations of both selenite and selenate showed the lowest resistance of all selected strains.
"There's a big incentive to cheat, to evolve a strain resistant to the killing factor," Dr. Losick said.
Tuberculosis can usually be cured with antibiotics that cost about $16, though recently a virulent strain resistant to standard treatment has flared in South Africa.
Mortality of the Mozo strain (susceptible) compared to that of the Juarez strain (resistant) exposed to 12 µM of ivermectin at different times.
The reason, agency officials said, was that they wanted a weapon against anthrax should they come up against a strain resistant to drugs in the penicillin and tetracycline families of antibiotics.
Martha Devlin contracted MRSA after surgery last September, but the superbug mutated further to become GISA - Glycopeptide-Intermediate Staphylococcus Aureus - a strain resistant even to the few drugs used to treat MRSA.
