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Like other scientists and public health experts, we have argued that more asymptomatic people, not fewer, need to be tested to bring the pandemic under control. Now, in the face of a dysfunctional C.D.C., it's up to states, other institutions and individuals to act.

relentless and often unpredictable coronavirus has, among its many quirky terrors, dredged up once again the issue that will not die, science versus pseudoscience. The scientists, experts who would be the first to admit they are not infallible, are now in danger of being drowned out by the growing chorus of pseudoscientists, conspiracy theorists, and just plain troublemakers who seem to be as symptomatic of the virus as fever and weakness.

To control an epidemic, authorities will often impose varying degrees of lockdown. In a paper in the journal Chaos, scientists have discovered, using mathematics and computer simulations, why dividing a large population into multiple subpopulations that do not intermix can help contain outbreaks without imposing contact restrictions within those local communities.

Part of pandemic preparedness is acknowledging that human, wildlife, and ecological health are inseparable.