Some visitors have asked if Malaria is a problem. Although rarely a problem for tourists, it does exist and has been a problem for some residents. A period of heavy rains increases the likelihood of an outbreak. This would most likely be after the rains come around August-September. A type of malaria they have in Oaxaca is called Vivax and is rather easy to cure.
Symptoms are typically fever, vomiting, sweats and chills that persist for days or weeks.
Outbreaks may be rather localized since the mosquito's range is only a mile or two. If you are concerned about malaria, see your doctor prior to leaving for preventative medication. Also, use your mosquito repellant when necessary. Mosquitos are a constant nuisance on the Oaxaca Coast. However, some types of mosquitos carry the diseases malaria and dengue fever .