People reinfected with cold coronaviruses. Posted May.
Why should we assume SARS-CoV-2 would be different?
Answer cannot be "novel virus", "no solid evidence that it reinfects", "I am an expert" or "magic pony for Christmas", although the latter would be most accurate.
A general finding is that antibody is present in a significant portion of adults who, in spite of possessing this antibody, can go on to have reinfection and illness.
I'm not sure I have the time to explain just how much information is out there so I am just going to post screenshots of articles dealing with airborne/aerosol spread until I get tired.