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Mosquito-borne disease

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Mosquito-borne disease

Endemic range of yellow fever in Africa (2005)
Endemic range of yellow fever in South America (2005)

Mosquito-borne diseases or mosquito-borne illness are disease caused by bacterial, viruses or parasites transmitted by mosquitoes. They can transmit disease without being affected themselves.

Some important diseases transmitted by mosquitoes include: malaria, dengue, Filariasis and West Nile virus.[1]

Nearly 700 million people get a mosquito borne illness each year resulting in greater than one million deaths.[1]

Types

Mosquito borne illnesses include: malaria, dengue, West Nile virus, chikungunya, yellow fever, Japanese encephalitis, St Louis encephalitis, Western equine encephalitis, Venezuelan equine encephalitis, Eastern equine encephalitis and La Crosse virus.[1]

Protozoa

The female mosquito of the genus Anopheles carries the malaria parasite (see Plasmodium). Worldwide, malaria is a leading cause of premature mortality, particularly in children under the age of five, with an estimated 207 million cases and more than half a million deaths in 2012, according to the World Malaria Report 2013 published by WHO.

Myiasis

The human botfly (Deramatobia hominis) uses a mosquito to deliver its eggs and transfer it to a person, the eggs are in the underside of the mosquito vector. When the mosquito takes a blood meal to their human host,the eggs landed on the skin and started to hatched into Larvae and start to feed on Human flesh and blood.

Helminthiasis

Some species of mosquito can carry the filariasis worm, a parasite that causes a disfiguring condition (often referred to as elephantiasis) characterized by a great swelling of several parts of the body; worldwide, around 40 million people are living with a filariasis disability.

Virus

The viral diseases yellow fever, dengue fever and chikungunya are transmitted mostly by Aedes aegypti mosquitoes.

Other viral diseases like epidemic polyarthritis, Rift Valley fever, Ross River Fever, St. Louis encephalitis, West Nile virus (WNV), Japanese encephalitis, La Crosse encephalitis and several other encephalitis type diseases are carried by several different mosquitoes. Eastern equine encephalitis (EEE) and Western equine encephalitis (WEE) occurs in the United States where it causes disease in humans, horses, and some bird species. Because of the high mortality rate, EEE and WEE are regarded as two of the most serious mosquito-borne diseases in the United States. Symptoms range from mild flu-like illness to encephalitis, coma and death.[2]

Viruses carried by arthropods such as mosquitoes or ticks are known collectively as arboviruses. West Nile virus was accidentally introduced into the United States in 1999 and by 2003 had spread to almost every state with over 3,000 cases in 2006.

Culex and Culiseta are also involved in the transmission of disease.

Transmission

A mosquito's period of feeding is often undetected; the bite only becomes apparent because of the immune reaction it provokes. When a mosquito bites a human, she injects saliva and anti-coagulants. For any given individual, with the initial bite there is no reaction but with subsequent bites the body's immune system develops antibodies and a bite becomes inflamed and itchy within 24 hours. This is the usual reaction in young children. With more bites, the sensitivity of the human immune system increases, and an itchy red hive appears in minutes where the immune response has broken capillary blood vessels and fluid has collected under the skin. This type of reaction is common in older children and adults. Some adults can become desensitized to mosquitoes and have little or no reaction to their bites, while others can become hyper-sensitive with bites causing blistering, bruising, and large inflammatory reactions, a response known as Skeeter Syndrome.

Mechanism

Mosquitoes carrying such arboviruses stay healthy because their immune systems recognizes the virions as foreign particles and "chop off" the virus's genetic coding, rendering it inert. Human infection with a mosquito-borne virus occurs when a female mosquito bites someone while its immune system is still in the process of destroying the virus's harmful coding.[3] It is not completely known how mosquitoes handle eukaryotic parasites so they can carry them without being harmed. Data has shown that the malaria parasite Plasmodium falciparum alters the mosquito vector's feeding behavior by increasing frequency of biting in infected mosquitoes, thus increasing the chance of transmitting the parasite.[4]

Prevention

When a mosquito bites, she also injects saliva and anti-coagulants into the blood which may also contain disease-causing viruses or other parasites. This cycle can be interrupted by killing the mosquitoes, isolating infected people from all mosquitoes while they are infectious or vaccinating the exposed population. All three techniques have been used, often in combination, to control mosquito transmitted diseases. Window screens, introduced in the 1880s, were called "the most humane contribution the 19th century made to the preservation of sanity and good temper."[5]

Epidemiology

Mosquitoes are estimated to transmit disease to more than 700 million people annually in Africa, South America, Central America, Mexico and much of Asia with millions of resulting deaths. In Europe, Russia, Greenland, Canada, the United States, Australia, New Zealand, Japan and other temperate and developed countries, mosquito bites are now mostly an irritating nuisance; but still cause some deaths each year.[6]

Historically, before mosquito transmitted diseases were brought under control, they caused tens of thousands of deaths in these countries and hundreds of thousands of infections.[7] Mosquitoes were shown to be the method by which Cuba and then around the Panama Canal in the early 1900s.[8][9] Since then other diseases have been shown to be transmitted the same way.

Mosquitoes are a perfect example of one of the many organisms that can host diseases. Of the known 14,000 infectious microorganisms, 600 are shared between animals and humans. Mosquitoes are known to carry many infectious diseases from several different classes of microorganisms, including viruses and parasites. Mosquito-borne illnesses include Malaria, West Nile Virus, Elephantiasis, Dengue Fever, Yellow Fever etc. These infections are normally rare to certain geographic areas. For instance Dengue Hemorrhagic Fever is a viral, mosquito borne illness usually regarded only as a risk in the tropics. However, cases of Dengue Fever have been popping up in the U.S. along the Texas-Mexican border where it has never been seen before.

References

  1. ^ a b c Caraballo, Hector (May 2014). "Emergency Department Management Of Mosquito-Borne Illness: Malaria, Dengue, And West Nile Virus". Emergency Medicine Practice 16 (5). 
  2. ^ Mosquito-borne diseases, infectious disease information, NCID, CDC
  3. ^ Susannah F Locke (1 December 2008). "Bug vs Bug: How do mosquitoes survive deadly viruses unscathed?". 
  4. ^ Koella, J.C.; Sorensen; Anderson (7 May 1998). "The malaria parasite, Plasmodium falciparum, increases the frequency of multiple feeding of its mosquito vector, Anopheles gambiae".  
  5. ^ History/reason of mosquito control in nj
  6. ^ "Mosquitoes and Mosquito Repellents: A Clinician's Guide"; by Mark S. Fradin: Annals of Internal Medicine, 1 June 1998. 128:931-940. Retrieved 10 July 2006.
  7. ^ The American Plague, by Molly Caldwell Crosby, p. 12, Berkley Books, New York, 2005, ISBN 0-425-21202-5
  8. ^ The Path Between the Seas: The Creation of the Panama Canal 1870-1914, by David McCullough, 1977, Simon and Schuster, ISBN 0-671-24409-4
  9. ^ The American Plague, by Molly Caldwell Crosby, pp. 100-202, Berkley Books, New York, 2005, ISBN 0-425-21202-5
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