Tuesday 13 October 2015

Present dengue less fatal, it’s not epidemic: IMA

Indian Medical Association released dengue guidelines and said not to panic about the new dengue serotype. It said that the present serotype is less fatal than the one in 2013.
What are different serotypes of dengue?
Dengue normally are of Den1, Den2, Den 3 and Den4 serotypes.
Serotypes 1 and 3 are less dangerous as compared to 2 and 4.
This year its serotypes 2 and 4 which are prevalent.
This is the first time the type 4 strain & type 2 have emerged as the dominant types in Delhi.
What happens when a serotype becomes dominant?
When the dominant strain remains the same for a long period, a significant population develops immunity to it, and fewer patients are diagnosed with the virus.
Infection with one of the four serotypes of dengue virus (primary infection) provides lifelong immunity to infection with a virus of the same serotype. However, immunity to the other dengue serotypes is transient, and individuals can subsequently be infected with another dengue serotype.
Subsequent infection with a second type increases the likelihood of serious illness.
About Dengue:
It is also known as breakbone fever.
It is a mosquito-borne tropical disease caused by the dengue virus.
Dengue is transmitted by several species of mosquito within the genus Aedes. These mosquitoes usually live between the latitudes of 35° North and 35° South below an elevation of 1,000 metres. They typically bite during the day, particularly in the early morning and in the evening.
The number of cases of dengue fever has increased dramatically since the 1960s. But why?: It is because of the increasing rates of pesticide resistance among the two types of mosquitos responsible for transmitting dengue – the Aedes aegypti and Asian tiger mosquitos. Both are responsible for Dengue fever.
Symptoms:
Symptoms include fever, headache, muscle and joint pains, and a characteristic skin rash that is similar to measles.
In a small proportion of cases, the disease develops into the life-threatening dengue hemorrhagic fever, resulting in bleeding, low levels of blood platelets and blood plasma leakage.
Treatment:
As there is no commercially available vaccine, prevention is sought by reducing the habitat and the number of mosquitoes and limiting exposure to bites.
Treatment of acute dengue is supportive, using either oral or intravenous rehydration for mild or moderate disease.

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