@pointythings if there was no evidence that infection/exposure gives immunity then they wouldn't be developing a vaccine. It is evidence of antibody and t-cell response that is currently driving vaccine development.
"if natural infection with the virus can elicit a robust T cell response then this may mean that a vaccine could do the same,” said Fiona Watt, executive chair of the Medical Research Council.
Charles Bangham, chair of immunology at Imperial College London, said, “This excellent study provides strong evidence that T cell immunity to SARS-CoV-2 may last longer than antibody immunity.”
He added, “These results provide reassurance that, although the titre of antibody to SARS-CoV-2 can fall below detectable levels within a few months of infection, a degree of immunity to the virus may be maintained. However, the critical question remains: do these persistent T cells provide efficient protection against re-infection?”
One of the more recent publications There are plenty more if you want to look. As said in the article, we don't know yet whether exposure provides long term protection - but we don't know that about the vaccine yet either and yet you seem happy enough to push that idea. As I said, time will tell.
I'm not wilfully missing anything. I just happen to disagree with you. I could also be carrying flu asymptomatically (as around 70% of flu cases can be)and pass that on to that woman and yet I'm not offered the flu vaccine every year, nor am I guilt tripped about it.