Finally, some unexpectedly good news on community spread in Victoria:
Untrackable new cases in Victoria are drying up. The incidence of community spread cases with an unknown source are every epidemiologists nightmare. So their absence is a marker of how well the restrictions work– and whether the “fire” is under control. It’s cheery news.
Community spread is the number that matters most — more than daily infections. Known cases can be track-and-traced. Unknown cases mean whole clusters are spreading invisibly and restrictions need to be wider. Despite the depressing schedule planned in Victoria, if this reduction in unknown cases is sustained, then other options for pandemic management become possible. The NSW-style-management with intense tracking and tracing may suddenly become an option within weeks. (Though there may be a 50 case spike tomorrow just to prove me wrong.) Tracking and tracing works best at lower levels, and becomes overwhelming quickly as the number of clusters rise.
With strong restrictions, the exponential rise in infections can become an exponential fall. Where before each person might infect three new people, now three people staying home are only infecting one (or something like that). Two lines get extinguished instead of amplified, as the virus […]
via JoNova
September 7, 2020 at 01:16PM
