"No study detected live virus beyond day 9 of illness, despite persistently high viral loads," - is it possible that IgA antibodies in the mucosa neutralizes th

"No study detected live virus beyond day 9 of illness, despite persistently high viral loads," - is it possible that IgA antibodies in the mucosa neutralizes the virus even before it gets spread? That could also explain the strange heterogenity of the virus spreading - maybe some people have more IgA or have IgA earlier and don't really spread a live virus?