So-called herd immunity is a feature of many infectious diseases and can, in some cases, dampen an outbreak if enough people get asymptomatic, or "sub-clinical" cases and acquire protective antibodies. After a while, the virus - be it flu, measles, polio - can't find non-immune people to be its hosts.
But some specialists with wide experience of disease outbreaks are highly sceptical about whether this phenomenon happens in Ebola, or whether it could affect an epidemic.....? "We tend to think we can answer all the questions, but this is one of those things we may end up being taught by the virus itself."...Dr.Ram Mohan Reddy
