The key facts about swine flu cases in Delhi are as follows.
More than 1,700 swine flu cases have been logged in Delhi this year. This number is part of a larger surge in seasonal influenza infections in the region. The exact details of the surge and the number of cases are not specified in the provided evidence. However, it is clear that the situation is concerning, with a significant number of swine flu cases reported in the city. The evidence does not provide information on the specific causes of the surge or the measures being taken to address it. It also does not mention the number of cases in previous years for comparison. The article from The Hindu does not provide a breakdown of the cases by age group, gender, or other demographic factors. The evidence does not provide information on the severity of the cases or the number of hospitalizations or deaths due to swine flu in Delhi.