Contact tracing, testing and isolation is key for some diseases, but difficult for #COVID19 (and e.g. influenza) due to its contagiousness and many asymptomatic carriers. Can be used as part of a #lockdown strategy, or after herd immunity is reached, but will not work by itself. https://t.co/CH3tCarXlW
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Without a vaccine chasing herd immunity is unethical, inhumane, its madness! Ok? Not having an effective TTI system is costing lives!
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