Most of the Diseases that tourists pick up in Goa , is picked up via footwear , ie when walking about outside , walking through discarded food waste , the s--t & p--s , that is both human & animal in nature , and that is completely un-aavoidable ,is contacted onto the soles of footwear & then transfered all over your apartment / room floor , when you go in .
We really should wear slippers when walking about Indoors -- The disease/ germs are transferred from the floor , onto your bare feet , touch your feet , and their are bugs all over your hands , and from their can soon find their way into your system .
The two best precautions are -- remove footwear before entering your Living space , or wear slippers .