What Is the Yellow Fever Virus?

Yellow fever virus belongs to the yellow fever virus of the yellow fever family. It is an RNA virus.

Yellow fever virus

Introduction to yellow fever virus

Yellow fever virus belongs to the yellow fever virus of the yellow fever family. It is an RNA virus. It has visceral and neurotropic properties and is easy to die at room temperature.

Yellow fever virus transmission

After being infected by a mosquito bite, saliva containing yellow fever virus is injected into the subcutaneous capillaries of the human body, rapidly spreads to the local lymph nodes, continues to multiply, and enters the bloodstream several days later, forming viremia. The virus is then localized to tissues and organs such as liver, kidney, spleen, heart, bone marrow, and lymph nodes. Even if the virus has disappeared from the blood, the virus can still exist in the tissue and organ. Due to the direct damage of the virus, extensive tissue lesions are caused, and liver pathological changes are the most diagnostic specific.

Yellow fever virus species

Source of infection The main source of infection for urban yellow fever is the patient, which is most contagious within 3 days of onset; the main source of infection for jungle-type yellow fever is monkeys and other primates in tropical jungles.

Transmission media The main transmission vector of urban yellow fever is Aedes aegypti, and the transmission vectors of jungle-type yellow fever are Haemophilus, Mosquito, and mosquitoes, which can spread after 4 days at 37 . Infected mosquitoes can become virulent throughout life and can be transmitted via eggs. Epidemic city type: Human-Aedes aegypti-human form a cycle, without storage host. Elimination of Aedes aegypti will allow yellow fever to be controlled and eliminated, and outbreaks may occur when infectious sources enter the area where Aedes aegypti has re-emerged.

Jungle type: the mosquito-monkey-mosquito cycle forms the natural epidemic source of yellow fever

Yellow fever virus susceptible population

Susceptible people Non-immunized people are generally susceptible to yellow fever, and can obtain lasting immunity after recessive infection or onset. The neutralizing antibodies produced in the body can be maintained for life, and no re-infection is found. Most of the adults in the epidemic area have immunity, so the majority of children are affected.

Yellow fever virus epidemic season

Seasonal: The epidemic season in Africa and South America is mostly from March to April. At this time, it is rainy, the humidity is high, and the temperature is high, which is conducive to mosquito vector breeding and virus propagation in mosquitoes. Disseminated seasonality is not obvious, and the disease can occur throughout the year.