I think i rather go with her,i have watched her say twice this week,it is a new virus,they cannot just say it is like all the other ones so we will assume immunity,they need to test us now,in six months,in a year,18months,only then can they be certain
Feel free to go with her Karen, she and her organisation was also telling the world there was no human to human transmission at the end of January.
Also I'm afraid you're wrong about saying when they'll be certain. They'll be certain in 20 years. That's how long definitive studies take.
In the meantime, the rest of the world who actually have to deal with fighting the disease, will be relying on 300 years of research on viruses to assume that people will have immunity for years, long enough for the vaccine to arrive. Because that's how every other similar virus works.