Yellow fever (amarillosis, "Yellow Jack") - a viral disease, which is transmitted by mosquitoes pathogen genus Aedes.Mainly found in the countries of South America and Africa.
In Russia there is no yellow fever.But modern tourists who are going to South America and equatorial Africa, you need to find out whether vaccination against yellow fever is a prerequisite for their visit.
causative agent of yellow fever - Viscerophilus tropicus virus from the family togovirusov.In the cities, the source of infection are sick people, and in the wild - monkey.And in the cities and outside the spread of the virus involved in different types of Aedes mosquitoes.
Yellow fever belongs to the especially dangerous infections.And for the creation of a vaccine against yellow fever American Max Theiler he was awarded the Nobel Prize in 1937.
disease develops within an average of 3-6 days after the bite
virus enters the lymph nodes, where it multiplies rapidly, after which blood flow is spread throughout the body and affects the liver, spleen, kidneys and bone marrow.
Externally, the disease begins with a sharp rise in temperature to 39-41 degrees.On hyperemia stage the victim develops severe headaches, back pain and extremities.Swollen face, eyelids, blush whites of the eyes.Pulse quickens to 100-130 beats per minute.
On the second day of the disease begins vomit mixed with blood, oral mucosa is red, tormented human acute thirst.Jaundice - due to the typical color yellow fever gets its name.
On 4-5th day the temperature reduced to 37-37,5 deg., And a period of remission.
However, within a few hours after a temporary improvement of the status of the patient begins a jet period (stasis stage): the temperature rises again, it resumes hematemesis, begins bleeding from the nose, intestines, uterus.The body emerges purpura (bleeding in the form of dots and spots).
Due to the loss of blood pulse slows, blood pressure decreases, increases fatigue, pale man.Can develop delirium.
In the absence of immediate treatment can develop kidney and liver failure.When joining the bacterial infection, then there is a risk of myocarditis, pneumonia, sepsis and toxic-infectious shock, as well as soft tissue gangrene.
In severe yellow fever, a person can die already at the 2-3rd day of illness.
By appearances yellow fever is similar not only to other species of hemorrhagic fever with the symptoms, but also malaria, leptospirosis and hepatitis.
To determine the exact causative agent in addition to the general and biochemical blood test is also carried out virological and serological antibody test.
During the first four days, the patient is the source of the infection.To isolate it from mosquitoes and prevent further spread of the infection, the patient is placed in a separate box or isolated using nets.
against yellow fever virus is no specific treatment.It held only supportive therapy, including dialysis in the development of renal failure, and a course of antibiotics, if in the course of the disease is now a bacterial infection.
Mortality from yellow fever does not exceed 5-10%.
immunity in individuals who have had the disease persists for 6-8 years.
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