I was 18 in 1970 I don,t remember what I was doing but I think it was OK.I was 18 in 1974, I was too busy boozing and NOT getting my leg over to worry about what what was going on around me!
On a serious note would this have been regarded as serious as it is today, or would it have been allowed to spread and kill loads of people without all the knowledge and prevention we have in place now.