Care should be taken to avoid being bitten by insects like mosquitos as these are the carriers of a lot of these diseases. Viruses such as Dengue Fever is transmitted by mosquitos in the area and there is no prevention or vaccine other than preventing a bite by the infected mosquito. Sandflies, found near beaches and water, are very common small flies who bite by the dozens. The bites are hardly felt, yet afterwards they itch and hurt for days. Head and body lice from bedding or people may spread some diseases also, this is hard to prevent other than by staying in hotels with clean sheets every day.
Scorpions are common, and their bites are extremly painful and sometimes fatal.
They have an annoying habit of hiding during the day in clothes, shoes and other cool shaded places. Shaking your boots and pants out before putting them on can help control this, and wearing long pants and boots in risky areas. Rest frequently in the hot Mexican climate. Drink plenty of water even if your not thirsty and make sure that the water you drink is from a bottle. Ice cubes in restaurants should have a hole in the middle of them indicating they are made from purified water.