The US Centers for Disease Control and Prevention (CDC) has published a new report containing data from the National Antimicrobial Resistance Monitoring System (NARMS), which contains both good and bad news.
The data, for the year 2012, tracks resistance in humans, retail meats and food animals and reveals that multi-drug resistance in Salmonella decreased over the last ten years, with resistance to clinically important cephalosporins and fluoroquinolones remaining low in 2012. But resistance to quinolone drugs in Salmonella typhi rose to 68% casting doubts on the effectiveness of common treatments for typhoid fever.
One in five isolates of Salmonella Heidelberg was found to be resistant to the cephalosporin Ceftriaxone, which is used to treat Salmonella infections. This serotype has been involved in several recent outbreaks associated with raw chicken, including the on-going Foster farms outbreak.
The report also shows that Campylobacter resistance to the fluoroquinolone drug ciprofloxacin stayed at 25% in 2012, despite the withdrawal of FDA approval for the use of the related drug enrofloxacin in poultry in 2005. Resistance to some antimicrobial drugs in Shigella strains was also found to be increasing.
The full NARMS report can be found on the CDC website here.