The updated guidelines now say a close contact is someone who was within 6 feet of an infected individual for a total of 15 minutes or more, over a 24-hour period, according to a CDC statement Wednesday.
Whereas in the past the CDC said exposure time had to be 15 continuous minutes or more, the new definition says these short encounters can be spread out but if they add up to 15 minutes, there's a chance of infection. "Because the general public has not received training on proper selection and use of respiratory PPE, such as an N95, the determination of close contact should generally be made irrespective of whether the contact was wearing respiratory PPE", the CDC guidelines note.
Previously, CDC defined close contact as being within 6 feet of an infected person for at least 15 minutes.
This event happened in late July to mid-August, and the CDC did not name the correctional facility.
The excess novel coronavirus deaths would be in addition to the official toll of 216,025 published by the CDC on October 15, the report said. None had any symptoms, but the next day, all six tested positive.
The officer continued working rather than going into quarantine.
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Researchers noted that the study, tracing transmission among people in a Vermont correctional facility, once again once again confirms that wearing masks is still a priority for staying safe from the virus and reducing the risks of transmission, noting that between individuals who tested positive there were instances of being in close contact with at least one of the parties not having their masks on for brief periods.
Health officials went back and reviewed surveillance video of those encounters.
During one eight-hour shift, the correctional officer was within 6 feet of an infectious inmate an estimated 22 times, for a total of about 17 minutes of exposure, according to the CDC report.
The exposure was also traced to two other prison staff members who tested positive.
"The more time you spend with someone" who is infected with COVID-19, Schaffner said, "the more likely you are to get infected. It may have been that one of these six prisoners was a superspreader shedding an very bad lot of virus".
Wednesday's briefing comes as many states report increases in the number of COVID-19 cases. However, the average percentage change in deaths compared with previous years was largest for adults aged 25-44 years (26.5 per cent), the report said.