Read on Twitter
Except for the fact that it's exactly what happens with most other viruses, including other coronaviruses, but I guess if you're retarded enough this doesn't count as evidence 
https://twitter.com/WHO/status/1253995619921821698
https://twitter.com/WHO/status/1253995619921821698
Some elaboration on why I think this is scare-mongering. It's the same kind of confusion about what constitutes "evidence" that explains why the WHO insisted for so long that masks didn't work. https://twitter.com/phl43/status/1254072850161565696
Here is a good thread making the same point, but with more details. https://twitter.com/gro_tsen/status/1254069215264419841
