I GOT THE FUCKING FLU AGAIN!!!!!

[Guilmon and a shotgun]

You got the flu again because you have a weak and scrawny body. It's just natural selection.

Ironically, i never get sick and i'm hardly a beacon of intelligence...goes to show how random this natural selection business is.

Although, i always thought illness was a way of improving those who survive...you get the disease, survive and your body's ready to give it the one two next time it comes nosing around your nostrils or other orafices.
Thus, scientists invented vaccinations based on this and everyone was happy...until those tricksy viruses decided to use the fedora hat and fake moustache technique.