![]() ![]() Third, the CDC team also looked at similar flu-surveillance data from five other site across the U.S. It only means that if it was circulating, it was at such low levels that it could not be detected even when testing 5,000 specimens from people with respiratory illness.” “That doesn’t mean the virus wasn’t present anywhere in the community. 20 “showed no evidence of COVID-19 infection,” Butler says. More than 5,000 samples from this study collected from people with respiratory symptoms from Jan. Those came from people who were participating in the Seattle Flu Study to monitor for flu prevalence, and provided samples from the nose and back of the throat which could be re-analyzed for SARS-CoV-2. That conclusion is supported by another set of tests on specimens collected from nasal passages from people in the Seattle area, where the first U.S. case was identified in Washington state other cases identified in the area shared similar genetic signatures. Based on the these sequences, which serve as a type of genetic fingerprint for tracing different strains and lineages of the virus, the researchers believe there was one virus lineage introduced from China in late January, when the first confirmed U.S. and elsewhere also suggest that the virus wasn’t spreading widely in the U.S. Second, genetic sequences of the SARS-CoV-2 virus in the U.S. The 14 counties the agency focused on included those that ended up having early community-based cases and likely were among the first regions to have spread of the disease. Those data, part of the National Syndromic Surveillance Program, include 4,000 health care facilities in 47 states who report information on emergency room visits. First, he says, emergency room data from 14 counties across the country did not show an uptick in some of the hallmark symptoms of the disease, including fever, cough and difficulty breathing, until Feb. earlier than late January, but didn’t spread until then. Jay Butler, the CDC’s deputy director for infectious diseases head of the agency’s COVID-19 response and a co-author of the recent paper, highlights four lines of evidence to support idea that COVID-19 was in the U.S. But COVID-19 tests developed by the CDC were also delayed because of early contamination issues, which meant that public health officials were behind in identifying those who were infected.ĭr. government initially screened passengers arriving from infection hot spots in China in mid-January before stopping arrivals from the country altogether several weeks later. ![]()
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