<img height="1" width="1" style="display:none" src="https://www.facebook.com/tr?id=799546403794687&amp;ev=PageView&amp;noscript=1">

Other public health experts worry Colorado and the U.S. may be flying blind. Many governments dropped non-pharmaceutical interventions like masking and contact tracing, while not beefing up surveillance enough to give warning of a potential coming surge, said May Chu, an epidemiologist and clinical professor, also at the Colorado School of Public Health.