Seventy-six cases of dengue have been reported in the city in the first three weeks of August,according to data,compared to four cases in the same period last year.
In a further warning,the Delhi government said the National Centre for Disease Control (NCDC) had also found that the type-II strain of the virus,considered the most virulent,was most prevalent this year.
Overall,96 dengue cases have been reported this year so far. While doctors at AIIMS said they were yet to begin serological analysis of the virus this year,according to Health Minister Dr A K Walia,who took a meeting on Monday to discuss the steep rise in cases in the capital this month,NCDC experts had confirmed that the type-II strain was on the prowl this year.
But no deaths have been reported from the virus so far this year.
Till 2010,when Delhi saw over 6,000 dengue cases,and in 2011,when over 1,000 cases of dengue were reported,type-I was the most prevalent strain. Before that till 2007,maximum cases were of type-III.
The dengue virus has four known strains. Of these,the relatively milder strains are type-I,characterised by the classic dengue fever,and type-III which causes high fever without shock. The type-IV strain that causes fever with shock and type-II virus which causes thrombocytopenia or a drop in platelet count,haemorrhagic fever,organ failure and Dengue Shock Syndrome (DSS) are identified as the severe strains. Type-II has been identified as the most common cause of Dengue Haemorrhagic Fever (DHF),a condition that can lead to death.
Dr Walia said in surveys undertaken by national agencies,dense breeding of mosquitoes was found within the premises of several institutes,including centres of higher learning,technical and educational institutes,police stations,hospitals and government offices.
As per data collected by the Directorate of National & Vector Borne Disease Control Program for a survey from August 20-22,the container index breeding was very high in many areas of the city.