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Mosquito density survey a paradox in Ahmedabad

Wednesday, 26 September 2012 - 2:16pm IST | Place: Ahmedabad | Agency: dna

Survey by the civic health department says the mosquito larvae density in the city has decreased, even as the city is seeing a rise in malaria and dengue patients.

The number of mosquito larvae in the city has gone down. Ironically, while this should have meant a dip in the number of malaria and dengue cases, figures suggest otherwise.

In what comes across as a paradox, as per the intro-domestic mosquito breeding survey by the health department of Ahmedabad Municipal Corporation states that the mosquito larvae density in the city has decreased. However, there is a rise in patients of malaria and dengue.

With mixed climate prevailing over Ahmedabad, almost one in every 10 people is suffering from either malaria or dengue. On Tuesday, municipal hospitals of the city registered 10 cases of dengue and 14 cases of malaria.

The health department carried out a survey from September 1 to 10 and calculated the Breateu Index (BI) in the city as 1.2. BI is a parameter which indicates the number of ‘positive’ containers in which mosquito larvae were present.

The present BI figure suggests that of 1,000 houses checked, 12 had mosquito larvae. As part of the survey, the civic body had checked water containers in various households. The survey indicated that the highest density was found in Naroda Muthiya ward with BI of 2.5, while the least was found in Meghaninagar ward with 0.4 BI.

Talking about the index, a health official of AMC said the index is well within safe limits. “If the BI is less than 10, dengue transmission is low. If it is between 10 and 15, the potential transmission is moderate while a BI more than 15 indicates high transmission,” added the official.

It can be recalled that in August, BI was between 1 and 2. This month the index is 1.2. Contrary to this, the city this month has witnessed a rise in vector-borne diseases. Till last week, the figures of malaria and dengue were 295 and 94 respectively, which doubled to 474 and 152.

“We surveyed a total of 17.53 lakh containers in 8.44 lakh houses of all the zones of the city. From the survey, we found that 10,532 containers in 10,125 houses turned out positive and had mosquito larvae breeding,” said medical officer of health, Dr Suhas Kulkarni.

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