Some advice on staying healthy in the rural tropics. Do NOT do what this guy is doing, ie, going barefoot. Walking around in bare feet is a good way, among other things to pick up soil borne parasites. In this case, the individual in  the photo ignored such sound practice because  it was extremely muddy and he didn't want to wreck his shoes while trying to get his vehicle unstuck, calculating that in a low traffic area with few animals around he might be OK. Still not advisable. Such a person would be best advised to monitor his health carefully, and  possibly get some basic lab tests done upon arriving home.