Yellow fever

Yellow fever be a viral disease of typically short duration. Insyd chaw cases, symptoms dey include fever, chills, loss of appetite, nausea, muscle pains—particularly insyd de back—den headaches. Symptoms typically dey improve within five days. Insyd about 15% of people, within a day of improving de fever dey recur, abdominal pain dey occur den liver damage dey begin, wey dey cause yellow skin. If dis dey occur, de risk of bleeding den kidney problems dey increase.

De disease be caused by de yellow fever virus wey e be spread by de bite of an infected mosquito. E dey infect humans, oda primates, den chaw types of mosquitoes. Insyd cities, e be spread primarily by Aedes aegypti, a type of mosquito dem find thru out de tropics den subtropics. De virus be an RNA virus of de genus Orthoflavivirus, plus a full scientific name Orthoflavivirus flavi. De disease fi be difficult to tell apart from oda illnesses, especially insyd de early stages. To confirm a suspected case, dem dey require blood-sample testing plus a polymerase chain reaction.

A safe den effective vaccine against yellow fever dey exist, wey sam countries dey require vaccinations for travelers. Oda efforts to prevent infection dey include reducing de population of de transmitting mosquitoes. Insyd areas wer yellow fever be common, early diagnosis of cases den immunization of large parts of de population be important to prevent outbreaks. Once a person be infected, management be symptomatic; no specific measures be effective against de virus. Death dey occur insyd up to half of those wey get severe disease.

Insyd 2013, na dem estimate yellow fever e cause 130,000 severe infections den 78,000 deaths insyd Africa. Approximately 90 percent of an estimated 200,000 cases of yellow fever per year dey occur insyd Africa. Nearly a billion people dey live insyd an area of de world wer de disease be common. E be common insyd tropical areas of de continents of South America den Africa, buh no be insyd Asia. Since de 1980s, de number of cases of yellow fever dey increase. Dem dey believe dis be secof na fewer people be immune, more people dey live insyd cities, people dey move frequently, den changing climate dey increase de habitat for mosquitoes.

De disease originate insyd Africa wey e spread to de Americas starting insyd de 17th century plus de European trafficking of enslaved Africans from sub-Saharan Africa. Since de 17th century, na chaw major outbreaks of de disease occur insyd de Americas, Africa, den Europe. Insyd de 18th den 19th centuries, na dem consider yellow fever one of de most dangerous infectious diseases; na chaw epidemics sweep thru major cities of de US den insyd oda parts of de world.

Insyd 1927, de yellow fever virus cam be de first human virus to be isolated.

 References 

 External links 

 "U.S. Army Yellow Fever Commission." Claude Moore Health Sciences Library, University of Virginia



Category:Zoonotic viral diseases
Category:Biological agents
Category:Epidemics
Category:Tropical diseases
Category:Vaccine-preventable diseases
Category:Translated from MDWiki