How do you all deal with and avoid parasites and infestations?
Stay out of cabanas, they have some wonderful ones with spinning beds and mirrored ceilings, lazer show etc, but the reality is that they are used several times a day by filthy 200peso whores and probably not disinfected as often as would be considered hygenic.
Try not to have sex with anyone you don't know well enough to invite to dinner with your friends.
Try to resist the urge to scratch every street dogs infested ears, yes they pull funny faces and it is rewarding to give them some brief relief but again, they are filthy and most certainly are carrying some forms of parasite.
Me and my wife once caught something, a rash in all our warmer parts of our body, it was quite a few years ago and I can't even remember what it was, but it took some getting rid of with plenty cream and special wash. I understand it is quite common though as the pharmacy had the body wash behind the counter and she knew straight away where the cream was. We had been staying in cheap hotels while our home was repaired, go figure
Just touch fists, I stopped entirely shaking hands with anyone after I got this red eye infection that was very painful, at best I offer them an elbow, at worse I ignore their advance for a handshake and accept that I may have offended them.
Don't get arrested,police holding cells must be one of the most filthy, infected disgusting environments imaginable to us, apparently they are a breeding ground for all sorts of things and people can get quite sick after a day or two inside.
Other than that then your are just unlucky I think. There is only ever so much someone can do.