The meningitis thing bothered me too - Tom gave it to Jerry by rubbing it on his ring and then rubbing his back and no one else gets sick, not even Tom?
I thought he injected with a little needle he had on a ring?
Oh ok - I must have missed the needle - that makes much more sense.
The meningitis thing bothered me too - Tom gave it to Jerry by rubbing it on his ring and then rubbing his back and no one else gets sick, not even Tom?