I agree, I think there is likely meaningful immunity. But, it is very much up in the air on how long that immunity will last. SARS immunity lasts a few years (

I agree, I think there is likely meaningful immunity. But, it is very much up in the air on how long that immunity will last. SARS immunity lasts a few years (1-3 years I believe). On the other hand, several extant coronaviruses contribute to the common cold, and my understanding is that immunity for these is only a few months or less. This is partly why one can catch a cold multiple times in a year.