I was seconding what you posted, Oopsminty, as there are people around whose logic goes "Immunisation has almost eliminated XXXX so I don't need to be immunised"
I have had whooping cough twice, too, the second time was as an adult just fifteen years or so ago. I remembered the first time and was able to tell the GP the diagnosis. I also remembered that a child with a nasty cough had stood near me about 10 days before I felt ill.
My daughter had it as a child - she obligingly produced a coughing fit and whoop in front of the GP, who said he had never encountered the whoop before. Vaccination had weakened the disease so that people didn't have the obvious signs any more, so it was not being diagnosed as often.