Aw no hope it was just a one off! Don't feel bad, its not your fault!
Try not to get too worried. Just keep an eye on him for now. If his nose is just wet he might still have a bit of the infection but his body might be keeping on top of it and beating it on its own.
Thank you, I'll try and keep calm.
He's just sneezed about 5 times after a few moments in between.
I hope his body manages to fight it off, as nothing I know of has weakened his immune system other than the vaccinations which were done ages ago.
Good news.