BETHESDA, Md. (AP) — A deadly germ untreatable by most antibiotics has killed a seventh person at the National Institutes of Health Clinical Center in Maryland.

The Washington Post reported the death Friday. NIH officials told the paper that the boy from Minnesota died Sept. 7. NIH says the boy arrived at the research hospital in Bethesda in April and was being treated for complications from a bone marrow transplant when he contracted the bug.

He was the 19th patient at the hospital to contract an antibiotic-resistant strain of KPC, or Klebsiella pneumoniae. The outbreak stemmed from a single patient carrying the superbug who arrived at the hospital last summer.

The paper reported the Minnesota boy’s case marked the first new infection of this superbug at NIH since January.

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