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 . The risk of contracting these diseases is low although locally acquired cases of malaria do occur on the Oaxaca Coast. In recent years the incidence of these diseases has become relatively low because of the efforts of Mexican public health authorities. These efforts include the spraying of the walls and ceilings of all homes, hotel rooms, restaurant and other businesses and buses with insecticides from the DDT and malathion families. After biting a person a mosquito will always rest on the nearest wall.