Dengue Fever – Symptoms, Diagnosis, Prevention
Dengue fever, also known as typical dengue fever or primary dengue fever, is an acute viral fever.
In addition, because of the different infections, symptoms and prognosis methods, it can be further divided into hemorrhagic dengue fever, dengue shock syndrome, and continuous dengue fever.
The latter mainly affects children aged 3 to 10 years and can cause fatal bleeding.
Route of transmission
is caused by the subgenus of dengue virus and is transmitted by mosquitoes such as Aedes aegypti or A. cerevisiae.
By biting mosquitoes, infection spreading in people through dengue viruses, but they are not transmitting directly by a person to person.
The patient will have a virus in the blood one day before the onset and about 5 days after the onset of the disease.
If the mosquito absorbs the blood of the patient during this period, the virus will multiply in the mosquito,
after 8 to 12 days, the mosquito is starting an infection. If the vector mosquito absorbs blood containing the virus at a temperature below 18 degrees Celsius,
the virus does not multiply in the mosquito, so it is not infectious. Mosquitoes that are already infectious at high temperatures will temporarily lose their infectivity if placed at temperatures below 18 degrees Celsius but will return to infectivity when placed at high temperatures again.
the incubation period is about 3 to 14 days. Patients with typical dengue have at least three days of medical records, including severe headache;
posterior orbital pain, bone joint or muscle pain, chills, and rash after three to four days of high fever. Itching throughout the body.
Dengue shock syndrome has hypotension or narrow pulse pressure. Clinical examination often has a phenomenon of white blood cell reduction.
On the 4th to 5th day of onset, many patients white blood cells going to reduce to 2000 to 4000, and the particle ball may fall to 20 to 40% of the total number of white blood cells.
In addition, virus isolation or mosquito cell culture can be used, and then regular check for virus reproduction, combined with antibody testing, including hemagglutination inhibition test.
In addition, MAC-ELISA detected by IgM antibodies. IgM antibodies start to appear three days after the onset of the disease.
By the seventh day, more than 90% of the blood samples can be detected.
There is no age and gender difference in typical dengue infections, but the child’s prevalence is lower than that of adults.
Symptoms and menstruation are milder and less typical than adults, and the prevalence rate of the elderly is also low.
After rehabilitation, it has lifelong immunity to the same type of dengue virus.
Pay attention to environmental hygiene and avoid bitten by vector mosquitoes, including adding screens, screen doors, wearing long-sleeved clothes and trousers in high-infected areas,
and applying anti-mosquito agents on exposed parts of the body. Spraying appropriate insecticides helps control the epidemic.
There are currently no specific therapies or preventive vaccines.