TLDR; oxygen molecules are affected by 5G frequency of 60ghz and when you breathe those molecules with lungs your hemoglobin in body is not able to get those molecules into rest of your body, this is admitted by mobile companies but they don't care, wuhan and china uses 5g in whole country and all the "outbreak" cities have 5G, all quarantined cruise ships also have 5G.

https://www.youtube.com/watch?v=CtfqUtW_8AA&t=1182s
watch the video atleast if you don't want to read