9NEWS Health Expert Dr. Payal Kohli discusses why the so-called nightmare bacteria is so hard to treat. Infection rates from drug-resistant “nightmare bacteria” rose almost 70% between 2019 and 2023, according to a new report from Centers for Disease Control and Prevention scientists. Bacteria that are difficult to treat due to the so-called NDM gene primarily drove the increase, CDC researchers wrote in an article published Monday in the Annals of Internal Medicine. Only two antibiotics work against those infections, and the drugs are expensive and must be administered through an IV, researchers said. Bacteria with the gene were once considered exotic, linked to a small number of patients who received medical care overseas. Though the numbers are still small, the rate of U.S. cases jumped more than fivefold in recent years, the researchers reported. “The rise of NDMs in the U.S. is a grave danger and very worrisome,” said David Weiss, an Emory University infectious diseases researcher, in an email. It’s likely many people are unrecognized carriers of the drug-resistant bacteria, which could lead to community spread, the CDC scientists said. That may play out in doctors’ offices across the country, as infections long considered routine and easy to treat — like urinary tract infections — could become chronic problems, said Dr. Maroya Walters, one of the report’s authors. Antimicrobial resistance occurs when germs such as bacteria and fungi gain the power to fight off the drugs designed to kill them. The misuse of antibiotics was a big reason for the rise — unfinished or unnecessary prescriptions that didn’t kill the germs made them stronger. In recent years, the CDC has drawn attention to “ nightmare bacteria ” resistant to a wide range of antibiotics. That includes carbapenems, a class of antibiotics considered a last resort for treatment of serious infections. Researchers drew data from 29 states that do the necessary testing and reporting of carbapenem-resistant bacteria. They counted 4,341 cases of carbapenem-resistant bacterial infections from those states in 2023, with 1,831 of them the NDM variety. The researchers did not say how many of the infected people died. More local videos here: https://youtube.com/@9news Subscribe to NEXT: https://youtube.com/@Nexton9NEWS Stay connected: 9NEWS Website: https://www.9news.com/ Facebook: https://www.facebook.com/ilike9news X: https://twitter.com/9NEWS Instagram: https://www.instagram.com/9newsdenver/ Download the 9NEWS App: https://www.9news.com/appredirect/ Sign up for the 9NEWSLETTER: https://www.9news.com/email 9NEWS (KUSA) is located in Denver, Colorado.