DS has had rubella (he is immunised but we found out later he has issues with his immune system which are still being investigated). Google rubella as the doctors all looked at the rash and said it looked exactly like german measles as soon as they saw it (2nd one came in for 2nd opinion as it is very rare in an immunised child). He was sick the same as being normal sick, but you should determine what he has as you need to stay away from babies, other non immunised children and especially pregnant women.