Introduction of emergency measures could have have prevented more than 500 million SARS-CoV-2 infections, a new study on six countries has found.
The study published in in the journal Nature, is the first peer-reviewed analysis of the effects of emergency measures on the number of infections.
The sudden emergence and rapid spread of SARS-CoV-2 forced governments around the world to make quick decisions in response to a virus that could be fatal for a significant number of people — particularly those over the age of 65, with underlying health conditions, or from Black, Asian, and minority ethnic backgrounds.
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Although measures varied from country to country, they typically involved the closing of nonessential businesses, the shutting of schools, the implementation of physical distancing measures, restrictions on traveling, and an emphasis on home isolation.
However, these measures also come with major economic and social costs, which can themselves have a negative effect on public health.
The researchers also initially included Iran, but several factors meant that they were unable to compare these data with those of the other countries.
The international team had expertise in multiple languages, making it possible to gain a significant amount of information on the various policies implemented in these countries.
The study found that the emergency measures across these countries reduced the number of infections by approximately 530 million.
According to the lead author of the study, Prof. Solomon Hsiang: “So many have suffered tragic losses already. And yet, April and May would have been even more devastating if we had done nothing, with a toll we probably can’t imagine.”
“It’s as if the roof was about to fall in, but we caught it before it crushed everyone. It was difficult and exhausting, and we are still holding it up. But by coming together, we did something as a society that nobody could have done alone and which has never been done before.”
Travel restrictions and bans on gatherings were more mixed, with some countries showing benefits and others not.
School closures did not seem to have significant benefits, although the authors noted that more research is necessary to determine conclusively whether this was the case.
What is clear from the research is the significant overall reduction in infections that resulted from the implementation of emergency measures.
As Prof. Hsiang notes, “the last several months have been extraordinarily difficult, but through our individual sacrifices, people everywhere have each contributed to one of humanity’s greatest collective achievements.”
“I don’t think any human endeavor has ever saved so many lives in such a short period of time. There have been huge personal costs to staying home and canceling events, but the data show that each day made a profound difference. By using science and cooperating, we changed the course of history,” Prof. Solomon Hsiang.