I think this is an important point. While R0 for #COVID19 is relatively high at 2.5-3, it doesn't come close to some airborne diseases like tuberculosis (R0=10), chickenpox (R0=10-12), and measles (R0=13-18)https://twitter.com/engagedpractx/status/1252498745247199232 …
This is untreated pulmonary infections, R0 drops substantially with treatment
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Sounds odd to base contact tracing guidance on determining near contacts of treated TB patients. Example: Norwegian guidance aim to trace,in addition to households,those that have been exposed 8 hours or more to pat. with microscopy conf. dx. Doesn't align with R0 of 10.
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I also thought treated TB patients don't transmit, or that the risk of transmission is minimized (to far below R0<1). Here is the guidance (in Eng) of our national institute of public health: https://www.fhi.no/en/id/infectious-diseases/TB/tuberculosis-tb-in-norway---fact-sh/ …. Doesn't align with Ro of 10 of untreated TB patients.
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