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Yes, it’s done all the time. We even had that exact combination setup at our DZ for this month (before COVID-19).

There is no specific rule preventing it.

Holy dishonest reporting batman! Actual WHO quotes/timeline: Dec 31 - China reports first case to WHO. Jan. 7 — China identifies novel coronavirus as cause of the outbreak. Jan 15 - WHO: "According to the latest information we have, there is no clear evidence of sustained human-to-human transmission and there are no infections reported among health care workers. The fact that some cases do not seem to be linked with the Huanan seafood market means we cannot exclude the possibility of limited human-to-human transmission." Jan 15 - WHO: "It is not surprising that there are cases outside of China, and it is possible that there will be cases in other countries in the future. @WHO encourages all countries to continue preparedness activities. We have issued interim guidance on how to do this." Jan 20 - WHO: "it is now very clear from the latest information that there is at least some human-to-human transmission of #nCoV2019. Infections among health care workers strengthen the evidence for this." The US administration was encouraged to prepare for this on Jan 15th - the same day the WHO said they "cannot exclude" the possibility it is contagious. By Jan 20 they were clear - it was contagious. Trump on Mar 10th, almost 2 months later: "It will go away."

It's also hardly started. Something tells me that within a month you'll be back telling us that you understand more than anyone else how serious this downturn is going to be because your sister's an economist.