When you make a bioweapon, you want it to easily spread with a high R naught value, but not cause mortality, as then the infected ppersih before transmission.

Every indication in the medical journals is multiple stage infections causing immense long term crippling issues which is far worse than mortality. It's theorized it will be immensely costly in terms of premature disability and so wreck national healthcare budgets, either public or private.

If like tuberculosis, that causes a caeseating granuloma, which coccoons off in the lungs, and so when the patient gets older, it flares back up and spreads in a nursing home.

As it's a bioweapon, anything is plausible. The Chinese military dreamt up a way to cause the USA to fall and knowing that even if they lost 200 million, they could overrun the USA. How many soldiers now have reduced total lung capacity? How many will get pulmonary fibrosis? How many will have premature dementia which is one of the most expensive aspects of long term care?