Q: Is one day isolation sufficient to stop forward transmission of COVID-19?
A: People with COVID-19 could potentially transmit it to others well beyond a day after developing symptoms or testing positive. New guidance from the CDC advises people to isolate until they have been fever-free and with symptoms improving for at least 24 hours, and then take precautions for five days, which covers the period when “most people are still infectious.”
May 11 will mark the end of the federal public health emergency for COVID-19, bringing changes to health care and public benefits.
Polymerase chain reaction, or PCR, tests for COVID-19 are highly accurate. People on social media, however, are circulating lists of germs that they baselessly claim will cause such tests to be falsely positive. In reality, it’s the opposite. The lists include pathogens that have been tested by the manufacturers and did not react to the test.
The demand for at-home, rapid COVID-19 tests — sparked by the fast-spreading omicron variant in December — has continued in 2022. With that demand have come questions about the tests’ efficacy, how to use them and where to get them. We answer those queries and more.
Researchers use genomic sequencing — not the clinical tests used to diagnose patients with COVID-19 — to identify and track specific variants of the novel coronavirus, SARS-CoV-2, including the highly contagious delta variant. But viral posts try to deny the existence of the variant by misleadingly claiming there is “no ‘Delta Variant’ test.”
The COVID-19 vaccines currently in use must be administered via injection. But Instagram posts baselessly suggest that Bill Gates and George Soros will use COVID-19 tests to secretly vaccinate people who haven’t yet received the shots. There is no evidence for that conspiracy theory, and scientists say trying to administer a vaccine with a swab would likely not be effective.
Scientists consider polymerase chain reaction, or PCR, tests a highly reliable tool for diagnosing COVID-19. But social media posts are misrepresenting a recent Centers for Disease Control and Prevention announcement regarding the eventual discontinuation of its own test, falsely claiming the government has conceded that PCR tests aren’t reliable.
A chemical widely used to sterilize medical devices is also used for nasal swabs in COVID-19 testing. But a viral video misleadingly suggests that the swabs are dangerous — saying that the chemical causes cancer and can alter DNA. Experts say the chemical’s use in this context does not pose a threat to human health.
A viral headline shared on social media falsely asserts that the Centers for Disease Control and Prevention changed testing thresholds to “virtually eliminate” COVID-19 cases among vaccinated individuals. That’s wrong. The threshold in question simply applies to whether or not there is enough virus present in a sample for further analysis.
The Biden administration has made no changes to COVID-19 testing policies for either U.S. Immigration and Customs Enforcement or Customs and Border Patrol. But a claim circulating online falsely suggests that the administration has stopped testing detained immigrants before they are released.