Breaking In: We may all need to still embrace social distancing till 2020 – Harvard Expert

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Scientists have warned in an analysis that suggests there could be resurgences of Covid-19 for years to come.

The paper, published in the journal Science, concludes that a one-time lockdown will not be sufficient to bring the pandemic under control and that secondary peaks could be larger than the current one without continued restrictions.

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One scenario predicted a resurgence could occur as far in the future as 2025 in the absence of a vaccine or effective treatment.

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Marc Lipsitch, a professor of epidemiology at Harvard and co-author of the study, said: “Infections spread when there are two things: infected people and susceptible people. Unless there is some enormously larger amount of herd immunity than we’re aware of … the majority of the population is still susceptible.

“Predicting the end of the pandemic in the summer [of 2020] is not consistent with what we know about the spread of infections.”

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It may be possible to relax distancing measures periodically while maintaining cases within a volume that health services can cope with, but the grave health risks of infection to some people will remain the same until a vaccine or highly effective treatments are available.

New treatments, a vaccine, or increasing critical care capacity could alleviate the need for stringent physical distancing, according to the paper in Science. “But in the absence of these, surveillance and intermittent distancing may need to be maintained into 2022,” the authors conclude.

The overall numbers of cases in the next five years, and the level of distancing required, were found to depend crucially on the overall current levels of infection and whether all those who are infected gain immunity and, if so, for how long. The authors cautioned that these are big unknowns and that a precise prediction of the long-term dynamics is not possible.

If immunity is permanent, Covid-19 could disappear for five or more years after the first outbreak, the paper suggests. If people have immunity for about a year, as is seen for some other circulating coronaviruses, an annual outbreak cycle would be the most likely outcome.

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Asked to speculate on which of these scenarios was more likely, Lipsitch said: “Reasonable guesses are that there might be partial protection for close to a year. On the long end, it might be several years of good protection. It’s really speculative at this point.”

Under all scenarios considered, however, the models found that a one-time lockdown would result in a resurgence after restrictions are lifted.

Other teams have found evidence that the immune response varies across people, with those who only have mild or no symptoms showing a far weaker response.

“What you would expect to see – hope to see – is that people who have had it once … the disease would get milder,” she said before the latest paper was released.

Mark Woolhouse, a professor of infectious disease epidemiology at Edinburgh University, said: “This is an excellent study that uses mathematical models to explore the dynamics of Covid-19 over a period of several years, in contrast to previously published studies that have focused on the coming weeks or months.

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“It is important to recognise that it is a model; it is consistent with current data but is nonetheless based on a series of assumptions – for example about acquired immunity – that are yet to be confirmed. The study should therefore be regarded as suggesting possible scenarios rather than making firm predictions.”

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