Experts recommend that people take a rapid test for COVID-19 19 hours before the party instead of the day before.

Early data suggests that people with the new Omicron variant are more contagious than people using Delta.

An expert added to make sure that those who attended the party in the past few days did not experience cold-like symptoms.

Experts in response to the spread of Omicron variants said that people attending the party should undergo a quick test before the event to check for the presence of COVID-19.

Early data from the United Kingdom indicate that people infected with the new variant of Omicron are infected much faster than people infected with Delta. Experts warn that premature testing may miss cases.

The Omicron variant has 32 mutations in the part of the virus that infects human cells and is spreading rapidly in South Africa and the United Kingdom-probably because its mutations have helped it partially escape the immune response from previous infections and existing vaccines. According to the World Health Organization, we still don’t know whether Omicron will be more deadly than Delta—it is a mutant virus in itself—it is still the most common variant in the world.

Michael Mina, a former assistant professor of immunology and infectious diseases at Harvard University’s School of Public Health, said on Twitter on Sunday that testing one or two days before the incident “doesn’t work.”

"The type of test is not important, the most important thing is to test before participating in the event," he said. He said that you can go from "undetectable" to "very high" number of virus particles within 24 hours, called viral load.

Tim Spector, professor of genetic epidemiology at King's College London, said that Omicron has a very short "spread time." People should take a quick test "a few hours before leaving home", he told the Guardian on Sunday, adding that if people use crowded public transportation to participate in events, people should wear "high-quality masks."

Spector has 4.5 million users worldwide and runs the Zoe COVID-19 symptom tracker app. It said on Twitter on Thursday that the app’s self-reported data indicated that the infection took approximately 48 hours. He said that ideally, a quick test should be carried out within 12 hours before the incident.

Specter said: “Avoid large gatherings and divide your group into smaller groups so you can control the environment and let everyone test on the same day,” adding that people should also check that no one has appeared in the past. According to the Guardian, the symptoms of a cold are three to four days.

Spector said in a tweet on December 5 that Zoe app users participated in their 60th birthday in the UK, all guests were vaccinated, some people were vaccinated with boosters, and all were negative in a quick test 24 hours ago. Spector said that of the 18 people who attended, 16 people were reported to have been infected with Omicron, which caused mild symptoms after the event.

The Centers for Disease Control and Prevention recommends that people use rapid testing regardless of their vaccination status or symptoms. "A negative self-test result means that the test did not detect the virus. You may not have an infection, but the infection is not ruled out. Repeating the test within a few days and at least 24 hours between the two tests will increase your confidence that you are not infected." it says.

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