As a pre medical student who has taken biology and various health science classes, I would say its probably not likely your sickness could transmit to your snake. If you have a bacterial infection... Bacteria could effect the snake but bacteria transmission generally only occurs though fluids as in you would have to sneeze directly on the snake. A flu bug is a virus and virons are very specific to the cells from which they can infect. The HIV virus effects only 1 cell type in the human body. T-Cells.. Your snake will be fine. Just wash your hands before and after you handle it.