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Dangerous multidrug-resistant infections are surging in children across the country, researchers report in the Journal of the Pediatric Infectious Diseases Society.

From 2007 to 2015, the number of kids treated in hospitals for certain types of multidrug-resistant infections rose 750 percent, researchers found. Though overall incidence is still low, researchers say the study’s findings are pointing to worry trends—namely, silent spreading within communities, and severe, potentially life-threatening infections becoming common.

“The rate of rise was very rapid,” the study’s lead author, pediatrician Sharon Meropol of Case Western Reserve University, told CIDRAP News. “And if that continues it’s not going to be long before we get much higher rates.”