1/ @WHO published current COVID testing guidance on March 19.
https://apps.who.int/iris/bitstream/handle/10665/331501/WHO-COVID-19-laboratory-2020.5-eng.pdf?sequence=1&isAllowed=y

Only two sources in WHO's guidance discuss PCR Cycle Thresholds, both are from China and use CT from 37 to 40.

37 to 40 is now standard driving the case-demic, per NYT:
https://nytimes.com/2020/08/29/health/coronavirus-testing.html

2/ First source cited in @WHO's COVID testing guidance:
https://ncbi.nlm.nih.gov/pmc/articles/PMC7121484/

Second source cited in @WHO's testing guidance (PCR cycle thresholds in appendices):
https://nejm.org/doi/10.1056/NEJMoa2002032

3/ So that's the banal story of how the excessive 37 to 40 cycle thresholds became global standard for COVID PCR testing, driving the case-demic. China's numbers 37 to 40 were simply the only ones included in @WHO's global testing recommendations. https://www.nytimes.com/2020/08/29/health/coronavirus-testing.html

4/ The author of this @nytimes article must know the reason every COVID lab is conducting PCR tests at 37 to 40 cycle thresholds is because of WHO guidance based on two studies from China. Yet, the article never mentions @WHO or China.

Why is that? https://www.nytimes.com/2020/08/29/health/coronavirus-testing.html