"Herd immunity" may just be wishful thinking.
Some studies have shown no antibodies in the blood 3-4 months after the afflicted had "recovered". If that's the case, there may be no effective vaccine..
Why would antibodies stay in the blood forever? Of COURSE they will disappear over time.
Basic immunology teaches that when the body gets a bug, it produces antibodies to fight the bug. If it's a new bug, the body learns from it, learns how to make antibodies after you get sick, and after the infection is gone, when reinfected, it will be better able to fight off the bug. By making new antibodies for it.
??
