Multidrug-resistant "superbugs" that can cause dangerous infections in hospitals are becoming increasingly resistant to alcohol-based hand sanitizers and disinfectants designed to hold them at bay, scientists said.

In a study of what the researchers described as a "new wave of superbugs," the team also found specific genetic changes over 20 years in vancomycin-resistant Enterococcus (VRE) — and were able to track and show its growing resistance.

Their findings were published Wednesday in the Science Translational Medicine journal.