https://mp.weixin.qq.com/s/uc54iVcoBX__CfRBU78dTg
https://mp.weixin.qq.com/s/bfRkIBWv_-vtTXhssVF2BQ
Points raised in NY Times article•Standard tests diagnose large numbers of people carrying insignificant amounts of virus.
•Most are not likely to be contagious. If Ct >33, virus not grown in culture.
•A cycle threshold >35 is too sensitive.
•A more reasonable cutoff is Ct 30-35 or even Ct <30.
•In NY state lab, 50% of recent positives had Ct >35.
•In MA, 85- 90% of positives in July had Ct >30.
•Cycle threshold is never included in the results sent to clinicians.
•For outbreak tracing, cheap and abundant rapid tests are needed, even if less sensitive
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