Post by Admin on Mar 18, 2020 2:01:48 GMT
The reason we may be in for an extended period of disruption, Kucharski says, is that the main thing that seems to be working right now to fight this pandemic is severe social distancing policies.
Drop those measures — allow people to congregate in big groups again — while the virus is still out there, and it can start new outbreaks that gravely threaten public health, particularly the older and chronically ill people, those most vulnerable to severe illness. “There’s no way [the virus] is going to go away in the next few weeks,” he says.
The way things are looking now, we’ll need something to stop the virus to truly end the threat. That’s either a vaccine (there are some now entering clinical trials but it could be a year before they are approved) or herd immunity. This is when enough people have contracted the virus, and have become immune to it, to slow its spread.
Herd immunity is not guaranteed. Currently it’s unclear if, after a period of months or years, a person can lose their immunity and become reinfected with the virus (which would make achieving herd immunity more difficult). Also, herd immunity will come at the cost of millions of people becoming infected, and possibly millions of people dying.
It outlines two scenarios for combating the spread of the outbreak. One is mitigation, which focuses on “slowing but not necessarily stopping epidemic spread.” Another is suppression, “which aims to reverse epidemic growth.”
In their analysis, isolation of confirmed cases and quarantine of older adults without social distancing would still result in hundreds of thousands of deaths, and an “eight-fold higher peak demand on critical care beds over and above the available surge capacity in both [Great Britain] and the US.”
Suppression, which requires “social distancing of the entire population,” can save more lives and prevent hospitals from becoming extremely overburdened. But it needs to be maintained “until a vaccine becomes available (potentially 18 months or more),” the report states. And it warns “transmission will quickly rebound if interventions are relaxed.” Make no mistake: Suppression comes at a huge cost to our society, economy, and perhaps even personal well-being.