All four serotypes of dengue were isolated in various states and the report of the serotypes circulating in Delhi is expected within a week by the Ministry.

"All four serotypes (1, 2, 3 and 4) of dengue were isolated from time to time in various states. The report of the serotypes circulating in Delhi is expected within a week," said B P Sharma, Union health secretary.
In Delhi, till August 29, at least 831 persons were diagnosed with dengue. Two dengue deaths have been reported. The ministry has written a letter to the urban development department urging it to allow access to several unoccupied buildings and rooftops to check breeding.
Source-Medindia