I still do not get it. 12 people have a decreased sensitivity to which antibodies? - some specific antibodies or antibodies in general? Which vaccine (or all of them)? Provided sources are vague about this.
'Preliminary studies suggest that this virus exhibits decreased susceptibility to neutralizing antibodies from several people with a history of infection.'
( the best so far: https://news.ycombinator.com/item?id=24991194 )