One common way of transmitting Weil's disease is from soft drinks cans.
The shops buy cans on bulk pallets, and store them in the back. The rats run around at night over the tops of the cans. The shops put the cans on display and in their fridge compartments and sell them on to unsuspecting punters.
Wash your cans before you drink directly from them. Or use a glass.
My bike stays in the car, covered and chained up until I take it to transition - but I wonder how secure transition really is? Most events I've done have been spot on, but the worst was at RAF Halton Sprint triathlon in May, where you think security would be a given - The transition area at the end of the race was a free for all. Everyone was allowed in and no checks were made when taking my bike out.