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Thank you Hans_olo for the info.
The reason Im concerned that my GP got it wrong was that
a) My son had exact same symptoms of measles, I know fifths is similar but he was squinting from light for a few hours. I cant see that is a symptom of fifths.
b) my sons rash was never on his cheeks except for a few little spots about 3 hours after the first sign of rash, which was blotchy and behind his ears and around his neck.
Luckily my son now seems to be recovering, we had a full nights sleep for first time since Thursday last night and in fact hes still asleep now.
I know that if you get measles after vaccination that its milder but i was just concerned that this GP acted as if it was impossible to get measles and so it could only be fifths.
My son has had viral rashes before with cold symptoms but they were nothing like this, and 4 days of high fever before the rash appeared were like nothing he'd ever had before. 102-105.4 for 4 days with no let up
And yes, I am in my 30s, thanks for the info on the older vaccinations