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Over half of people in 10 states who died of opioid overdoses during the second half of 2016 tested positive for fentanyl, according to new data published today in CDC's Morbidity and Mortality Weekly Report (MMWR) Early Release.

The report found that out of a total of 5,152 opioid overdose deaths, almost 3,000 tested positive for fentanyl, and over 700 tested positive for drugs that have similar chemical structures to fentanyl (fentanyl analogs) - including the extremely potent fentanyl analog, carfentanil, which is used to sedate large animals.

This is the first report on data from the State Unintentional Drug Overdose Reporting System (SUDORS), which tracks fatal opioid overdoses and is a component of CDC's Enhanced State Opioid Overdose Surveillance (ESOOS) program. SUDORS makes it possible to use toxicology and death scene investigation data previously unavailable across states, to provide insights into specific substances and circumstances driving overdoses. This information can help uncover changes in the opioid epidemic and inform interventions.

CDC researchers examined opioid overdose deaths from July 1 to December 31, 2016 in 10 states: Maine, Massachusetts, Missouri, New Hampshire, New Mexico, Ohio, Oklahoma, Rhode Island, West Virginia, and Wisconsin.

Recent CDC actions in response to the opioid overdose epidemic  

Because of the large proportion of opioid overdose deaths testing positive for fentanyl and fentanyl analogs, opioid overdose surveillance must expand to track the rapidly changing illicit opioid market. Funding for enhanced and timely surveillance is one of CDC's key investments to inform opioid overdose prevention efforts. CDC has: