Viral rashes usually only last a few days.

I will also add that if the rash looks like burst capillaries (lots of little red lines through it) it is possibly a menninga chocol and you should see your GP straight away. I know no-one in here has described a rash like that, but thought I would add that in case anyone else is looking over this info and needs to know. It is also not a bad piece of info to file away in the back on your mind JIC.

Ali - hope your baby is better soon. Sick babies really are very sad.