Deadly infections with bacteria that resist even the strongest antibiotics are on the rise in hospitals in the United States, and there is only a “limited window of opportunity” to halt their spread, health officials warned Tuesday. http://www.nytimes.com/2013/03/06/health/deadly-drug-resistant-infections-rise-in-hospitals-report-warns.html?ref=us&_r=0  The bacteria, normally found in the gut, have acquired a lethal trait: they are unscathed by antibiotics. Forty-two states have had cases of carbapenem-resistant infection. The problem is most common in the Northeast.