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Anti-nausea Medication Caused Infection in Cancer Patients

by Julia Samuel on March 21, 2016 at 9:29 PM
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The source of a potential deadly blood infection in more than 50 South American cancer patients has been identified by scientists at The Translational Genomics Research Institute (TGen).

Using advanced genomic sequencing, TGen was able to track a potentially deadly and therapy-resistant fungus, Sarocladium kiliense, to a tainted anti-nausea medication given to dozens of cancer patients in Chile and Colombia, according to a report in Emerging Infectious Diseases, published by the U.S. Centers for Disease Control and Prevention.

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Anti-nausea Medication Caused Infection in Cancer Patients
Anti-nausea Medication Caused Infection in Cancer Patients

"Contamination of medical products, particularly with environmental fungi, poses growing concern and a public health threat, especially in vulnerable populations such as cancer patients," said Dr. David Engelthaler, Director of Programs and Operations for TGen's Pathogen Genomics Division in Flagstaff, Ariz.

"Increased vigilance and the use of advanced technologies are needed to rapidly identify the likely sources of infection to efficiently guide epidemiologic investigations and initiate appropriate control measures," said Dr. Engelthaler.
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This bloodstream-infection outbreak, from June 2013-January 2014, included a cluster of cases at eight hospitals in Santiago, the capital of Chile. All of the patients received the same four intravenous medications. But only one -- ondansetron, an anti-nausea medication -- was given exclusively to cancer patients.

All of the patients infected with S. kiliense received ondansetron from the same source, a pharmaceutical company in Columbia. Two of three lots of unopened ondansetron, tested by the Chilean Ministry of Health, yielded vials contaminated with S. kiliense, forcing a recall of all ondansetron in Chile made by the Columbian manufacturer.

Subsequently, Colombian officials discovered 14 other cases in which patients, given ondansetron from the same Columbian pharmaceutical firm, were infected with S. kiliense. The source of the contamination was identified only as "pharmaceutical company A" in the CDC report.

S. kiliense has been implicated previously in healthcare-related infections, but the lack of available typing methods has precluded the ability to substantiate sources.

"The use of whole-genome sequence typing (WGST) to investigate fungal outbreaks has become integral to epidemiologic investigations," Dr. Engelthaler said. "Our WGST analysis demonstrated that the patient isolates from Chile and Colombia were nearly genetically indistinguishable from those recovered from the unopened medication vials, indicating the likely presence of a single-source infection."



Source: Eurekalert
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