The problem with achieving 'natural immunity' is developing it requires you to catch the disease. Measles, mumps, and chick-pox are mostly mildish illnesses, but they can all turn nasty. Killers. Not unusual for measles to cause blindness or even death. Grown men fear mumps for good reason – it causes agonising swelling of the testes and sterilisation.
The advantage of artificially immunising against disease is that vaccines are much less aggressive than wild bugs. As soon as they became available, most countries used them and real outbreaks all but disappeared. Denied of hosts Smallpox has been eliminated entirely, but not the others. Sadly, because vaccines are not completely safe, and one has been falsely linked to autism, many parents have chosen not to vaccinate their children, and as a result, the real diseases are back. (In my opinion objecting to vaccination is so stupid the state should stamp on the parents. Selfishly refusing vaccination endangers the population as a whole – people risking their own kids is one thing, but in my view it's not acceptable for other children to suffer because of misplaced parental concerns. )
Before 1950 contagious diseases were common, and they were rampant before 1930. Measles killed 1,145 children in 1941 Britain, between the years 2000 – 2016 only 1, 2 or zero per year. I'm lucky to be here because my mum, aged 4, only just survived Diphtheria.
Immunity provided by vaccination is at least as good as naturally acquired immunity, applied consistently it protects everybody, and it's far less dangerous.
Dave
Edited By SillyOldDuffer on 23/05/2019 13:12:33
Edited By SillyOldDuffer on 23/05/2019 13:15:09