Exactly. as long as your not running around like an idiot disturbing it, you shouldnt have much of a problem... You can get ill from breathing in pigeon faeces, twist an ankle falling through a dodgy floor, but it doesnt stop us from exploring pigeon-infested death-trap derps. TBH,
@Kraxous, if you are so concerned about it, or concerned about climbing onto hoardings then why choose exploring as a hobby?