Malaria is the most significant parasitic disease threat you will face in most tropical and subtropical countries. It is a microscopic blood- borne parasite transmitted to humans by the bites of infected mosquitoes. There are 300 to 500 million cases a year of malaria worldwide —approximately 1000 a year are reported in U.S. travelers.
Dengue fever and dengue hemorrhagic fever are viral illnesses transmitted by the bite/sting of a mosquito. The mosquito species that carries dengue virus is active, biting during daylight hours, with a peak of activity just after daybreak, and then again for several hours before dark. These insects are often present indoors, and are common in areas of human habitation, including urban and rural areas throughout the tropical areas of the world.
Symptoms of dengue fever include:
Barotrauma is discomfort in the ear caused by pressure differences between the inside and the outside of the eardrum.
The air pressure in the middle ear is usually the same as the air pressure outside of the body. If the eustachian tube (the connection between the middle ear and the back of the nose and upper throat) is blocked, the air pressure in the middle ear will be different than the pressure on the outside of the eardrum, causing barotrauma.