Second Aedes assortment behind quick spread

With dengue cases rising quick even outside Dhaka, specialists currently dread that a second assortment of Aedes mosquito is in charge of the fast spread of the viral infection.

In a “pestilence condition” with mosquito-borne illnesses like filaria, dengue and chikungunya, an optional vector (transporter) ends up dynamic close by the essential vector, they said.

There are two assortments of Aedes mosquito – Aedes Aegypti and Aedes Albopictus, the previous being the essential vector and the last the auxiliary vector of dengue fever.

Specialists state reports of a developing number of dengue cases outside Dhaka show that their doubt about the auxiliary vector is likely valid. They suggested doing a broad review on the issue and take activities in like manner.

A record 22,919 dengue cases have been accounted for since January this year, with 14,996 cases in July alone. Of the cases, 4,905 were accounted for from outside Dhaka, as indicated by the Directorate General of Health Services (DGHS).

In the 24 hours till 8:00am yesterday, 1,645 new cases were accounted for. Emergency clinic sources affirmed 52 passings up until now, in spite of the fact that the DGHS puts the loss of life at 18.


Kankar Ghosh, a disease transmission specialist at Dhaka Shishu Hospital, said the side effects of dengue fever this year are unique in relation to those in earlier years.

Manifestations like fever with heaving, stomach torment, plasma spillage and intense kidney damage are new, he said.

Sometimes, state of patients crumbled quick, he called attention to, including this might happen on account of the infection conveyed by Aedes Albopictus, the optional vector.

“We have no degree for investigating the issue widely in Bangladesh, however as a disease transmission expert I presume a few patients are being contaminated by Aedes Albopictus. What’s more, this is the reason state of certain patients are breaking down quickly,” he said.

“There are no papers to help it, yet speculatively there are 70 percent possibilities this is valid,” he said.

Kholilur Rahman, boss entomologist of DGHS, prescribed completing a broad review to investigate the issue.

Past examinations show just 2 percent of Aedes mosquito are of Albopictus assortment, and their essence is high outside Dhaka. This is the reason it is hard to state without a doubt that Albopictus is dynamic in Dhaka, he said.

On the off chance that Albopictus mosquitos assume a job outside Dhaka, at that point it will essentially add to the spread of dengue in regions just as in provincial territories on the grounds that Albopictus populace is higher in there, he said.

The DGHS led four studies in Dhaka in 2018 and 2019 and discovered Albopictus populace was 2 percent of all Aedes mosquito populace.

Be that as it may, overviews done before 2006 found around 20 percent Aedes mosquito populace was of Albopictus assortment in Dhaka. It was higher in Chittagong city, Kholilur included.

In Rangamati, a 2017 study by the DGHS discovered 30 to 35 percent Albopictus mosquito, he stated, including that the facts used to demonstrate that in the event of mosquito-borne illnesses like jungle fever, dengue and filaria, an auxiliary transporter may end up dynamic in a “scourge” circumstance.

There are around 123 verities of mosquito in the nation – 13-16 in Dhaka, including Aedes mosquitos.

“It is a speculation and I presumed it around 15 days back that this sort of circumstance may emerge,” he said.

Dengue infection was first recognized in Bangladesh in 2000, however it never spread to every one of the 64 areas, he said.

Aedes Albopictus is a wild mosquito, frequently called “tiger mosquito,” while Aegypti is a residential mosquito, he said.

As per him, Aedes Albopictus is behind the quick spread for the current year in light of the fact that there is no nearness of Aegypti mosquito in towns.

“You will discover Albopictus mosquito in towns. In the event that it were not for Albopictus mosquito, the sickness would not have spread in such a speed,” he said.

Prof Mahbubur Rahman, who did his doctoral research on Aedes mosquito, said Albopictus mosquito populace is high in territories with tremendous number of trees while Aedes Aegypti breeds in normal and fake compartments. This is the reason Aedes Aegypti is found in city regions.

Utilizing bug sprays isn’t a viable answer for control Aedes mosquito as its eggs stay feasible for as long as one year, said Mahbubur, head of Norail Govt Mohila College.

He recommended uncommon measures to decimate all compartments like surrendered tires, plastic measures, basins and mud pots to control Aedes mosquito.

A July 17-27 review by the DGHS in the two Dhaka city companies discovered disposed of tires, overwhelmed floors, plastic drums, water tanks, plastic cans, mud pots, bloom tubs and plate, paint pots, tin and metal jars, and plastic mugs are the principle reproducing spots of Aedes mosquito.

DGHS Director (transmittable infection control) Prof Sanya Tahmina said they have an arrangement to lead a study on Albopictus.

Aside from Aedes Aegypti, there are Aedes Albopictus outside Dhaka and it might add to the spread of dengue, she noted.

“We may send our groups to certain spots to get grown-up Albopictus to check whether those mosquitos are conveying infection,” she stated, including that past examinations did not discover infection in Aedes Albopictus.

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