Contact tracing becomes useless after more than 5 days in COVID-19 test-study

Contact tracing has become one of the most powerful ways to constantly break the chain of infections that infect deadly viruses like Covid-19. However, many studies showing that asymptomatic carriers are “hyperspreaders” suggest that little is known about the coronavirus prevalence. New research requires quick testing and quick reporting of results Contact trace As successful as possible.

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Tests that take more than 5 days are useless

According to researchers at the University of Utrecht in the Netherlands, a contact test that takes more than 5 days has little benefit.

Researcher who published the research Public health journal lancet, The contact tracking above is considered the gold standard for combating the outbreak of infectious diseases.

Still, according to experts, contact traces include identification of potentially infected individuals, isolation of infected persons, monitoring of potentially affected persons, and their confirmation and quarantine or quarantine. It will be.

Researchers say three factors are needed for such efforts that could reduce the spread of the virus. First, monitoring should be done on the day the symptom occurs. Secondly, you should monitor your contacts when the results of the day’s checks are returned. Third, the trace coverage should be 100%.

After a test delay of more than 3 days, a full touch trace did not prevent the virus from accelerating its spread. Researchers considered both traditional and app-based methods Contact trace.. Due to its high speed, app-based tracing techniques are more successful than traditional methods, even with less contact area.

If you can reduce the turnaround time, tracking contacts can help.

Researchers say the study strengthens findings from other modeling studies and indicates that contact tracking could be an effective intervention to prevent the spread of the SARS-CoV-2 virus. However, they emphasized that tracking was effective only when the percentage of contacts tracked was high and the process was fast.

“Our study builds on this and details how each step in the process plays a role in the success of this approach,” Mirjam, one of the lead authors of the study. Said Kretzschmar.

Also read: [BEWARE] Authorities Warn Publicly About COVID-19 Contact Tracking Scams

Experts not involved in the study agreed that rapid testing was the key to successful contact tracking. The results are consistent with other studies, said Dr. David Bonsor, a senior scientist and clinician at the Nuffield School of Medicine at Oxford University who did not participate in the study.

“We agree that manual tracking efforts should also return test results within 24 hours and then aim to quickly track people,” he said in a statement.

But before people can harm others, they need to warn and touch the trace to make it work. According to Bonsall, the pre-symptomatic infection rate ensures that the full delay between onset of symptoms and follow-up does not exceed 48 hours.

Louise Ivers and Daniel Weitzner of Global Health and General Hospital Center in Massachusetts Expressed Their concern about relying on the application to keep track of contacts.

In a commentary, Ivers and Weitzner write that these results are “unproven” as a public health intervention.

Also read: Scientists fine-tune smartwatches to detect wearer’s COVID-19 infection 9 days before symptoms occur: Here’s how

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