The number of H1N1 (swine flu) cases in Delhi has crossed 1,770. Amid this rise, doctors have issued an advisory covering the use of masks, avoiding crowded places, and appropriate medication. Doctors have sought to strike a balance between exercising caution and not causing undue alarm among the public. (Note: The available source material does not specify the detailed points of the advisory, the time period over which cases rose, or statements from health authorities. This report will be updated as more information becomes available.)