Spread through the bite of an infected mosquito, viruses such as dengue, West Nile and yellow fever kill more than 50,000 people worldwide every year, according to estimates by the WHO and the CDC. (Malaria — which is also spread by mosquitos, but is caused by a parasite rather than a virus — kills more than 600,00 people yearly.)
At least 40 percent of the world’s population, or about 2.5 billion people, are at risk of serious illness and death from mosquito-borne viral diseases, according to the CDC.
Dengue fever, which is endemic to parts of South America, Mexico, Africa and Asia, claims approximately 22,000 lives every year, according to the CDC. Dengue hemorrhagic fever is a deadly infection that causes high fevers and can lead to septic shock.
These diseases occur in regions neighboring the United States, making them a threat in this country.
“Dengue is very active in the Caribbean, and travelers to the Caribbean come back to the United States with dengue,” said Dr. Robert Leggiadro, a New York physician and professor of biology at Villanova University in Pennsylvania.
People infected with dengue while traveling abroad can spread the disease at home when mosquitos bite them, and then bite other people, Leggiadro said.
Even more deadly than dengue is yellow fever, which mostly affects people in Latin America and Africa. The disease causes an estimated 30,000 deaths worldwide, according to the WHO.
Less deadly, but still dangerous is West Nile virus, a viral neurological disease that is spread by mosquitos that bite humans after feasting on birds infected with the virus. Although the vast majority of people infected with this virus will not show symptoms of West Nile, the disease has killed an estimated 1,200 people in the United States since it was first seen here in 1999, according to the CDC.
Not everyone is at high risk of contracting rotavirus, but for children around the world, this gastrointestinal virus is a very serious problem. Approximately 111 million cases of gastroenteritis caused by rotavirus are reported every year globally, according to the CDC. The vast majority of those affected by the virus are children under the age of 5, and about 82 percent of deaths associated with the virus occur in children in developing nations.
Globally, an estimated 440,000 children who contract the virus die each year from complications, namely dehydration. In the United States, a vaccine for rotavirus was developed in 1998, but was later recalled due to safety concerns. A newer vaccine, developed in 2006, is now available and is recommended for children ages 2 months and older.
Despite routine vaccinations for rotavirus in the United States, the CDC estimates that between 20 and 60 children under age 5 die every year from untreated dehydration caused by the virus.
While some parents in the United States have expressed concern about the complications that may arise as a result of vaccinating for rotavirus, Leggiadro told Live Science that vaccination for this and other preventable diseases is the best way to safeguard against diseases that, if left untreated, can be deadly.
Source | HuffingtonPost