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I read recently (I apologize for not having the link) that current spread in South East Asia is an indicator that the virus may not be impacted by summer months.

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Immediately after Boris Johnson completed his Monday evening news conference, which saw a somber prime minister encourage his fellow citizens to avoid "all nonessential contact with others," his aides hustled reporters into a second, off-camera briefing.

That session presented jaw-dropping numbers from some of Britain’s top modelers of infectious disease, who predicted the deadly course of coronavirus could quickly kill hundreds of thousands in both the United Kingdom and the United States, as surges of sick and dying patients overwhelmed hospitals and critical care units.

The new forecasts, by Neil Ferguson and his colleagues at the Imperial College COVID-19 Response Team, were quickly embraced by Johnson’s government to design new and more-extreme measures to suppress the spread of the virus.

The report is also influencing planning by the Trump administration. Deborah Birx, who serves as the coordinator of the White House coronavirus task force, cited the British analysis at a news conference Monday, saying her task force was especially focused on the report’s conclusion that an entire household should self-quarantine for 14 days if one of its members is stricken by the virus.

The Imperial College group reported that if nothing was done by governments and individuals and the pandemic remained uncontrolled, then 510,000 would die in Britain and 2.2 million in the United States over the course of the outbreak.

These kinds of numbers are deeply concerning for countries with top-drawer health-care systems. They are terrifying for less-developed countries, global health experts say.

If Britain and the United States pursued much more ambitious measures to mitigate the spread of coronavirus, to slow but not necessarily stop epidemic over the coming few months, they could reduce mortality by half, to 260,000 people in the United Kingdom and 1.1 million in the United States.

Finally, if the British government quickly went all-out to suppress viral spread — aiming to reverse epidemic growth and reduce the case load to a low level — then the number of dead in the country could drop to below 20,000. To do this, the researchers said, Britain would have to enforce social distancing for the entire population, isolate all cases, demand household quarantines of households where anyone is sick, and close all schools and universities — and do this not for weeks but for 12 to 18 months, until a vaccine is available.