Delhi's Department of Family Welfare has also sent a preliminary report of the survey to WHO India experts.
According to the officials from the Directorate of Family Welfare, around 800 cases of measles has been reported this year in the city.
Almost 450 cases were reported from Maharishi Valmiki Infectious Diseases (MVID) hospital alone between January and March.
As a part of the exercise, almost 90 lakh people have been screened for measles and many children were vaccinated.
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Throat swabs and urine samples of the confirmed 299 cases (till May 21 this year) have been sent to the National Centre for Disease Control (NCDC).
The NCDC has also released guidelines for collection and transportation of patient samples to the nodal agency to check for a possible mutation of the virus.