H.H.
you are NOT paranoid at all....any type of exposure or illiness to a newborn can turn serious very, very fast. I would not take any chances. I know you have to go so I would drive seperately and get a seperate room if at all possible. Also discuss this with your dr...they might be able to provide you some guidance on this.
I have a 5 month old...when he was 5 1/2 weeks old, my older son came down with H1N1 even after having recieved the first dose of the vaccination. Our pediatrician told me to put my newborn in a seperate room and not to take him out until my older son was 110% over the flu. By the grace of god, my newborn did not get it...I too was breastfeeding which helped but I think the isolation did it too. He was isolated for 3 weeks...to some this may sound extreme and crazy but he stayed healthy.