COVID-19 Response Roundup

University of California, San Diego researchers are developing a color-changing sticker for masks that detect SARS-CoV-2 in the user's breath or saliva—the sensor is meant to aid surveillance, not replace standard testing protocols, they emphasize. CBS  

KF94 Buzz: A mask called KF94 (“Korean filter” and 94% filtration efficiency) is the South Korean equivalent of the N95—comparable, but potentially easier to use, find, and afford. NPR Goats and Soda

Heavy caseloads and patients’ reluctance to cooperate could be hurting contact tracing efforts, according to the CDC’s Morbidity and Mortality Weekly Report; upping staffing levels and boosting public awareness could help. CIDRAP

Quantifying the effect of curfews—more typically used in response to natural disasters or conflict—is tricky; not all after-hours outings are high risk. The New York Times

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