Is that the rumor? Last I had heard, the best science is essentially a guess, but the thinking is that people will develop some kind of immunity. We know this

Is that the rumor? Last I had heard, the best science is essentially a guess, but the thinking is that people will develop some kind of immunity. We know this happens with other coronaviruses, and we have found antibodies in people who have recovered from the disease. I don't really know how we can definitively and ethically say "yes, people do develop some immunity to the virus" without deliberately attempting to reinfect people. Maybe an in vitro study would add to the evidence, but in vitro studies frequently don't scale up to whole humans.