the monkey sars made me do it

why must i get sick?  what purpose does this serve?  on the evolutionary scale, does this change me genetically?  i mean, i get the whole survival of the fittest and me giving my genes that are clearly able to survive the monkey sars epidemic* only helps future generations of humans...

but it is keeping me from my morning walk in.  i want to walk in.  and the monkey sars is making me drive to work.

*by epidemic, i mean that one person is infected with monkey sars... we shall refer to me as ground zero, and ground zero is spreading by getting fat from not getting to walk in...