Another dengue infection has turned up on Oahu, bringing Hawaii's count for the year to nine — a worry for residents, though all the cases so far came from outside the islands.

• A person on Oahu has been diagnosed with dengue, the ninth case in Hawaii this year.
• The infection was picked up while traveling abroad, not spread locally.
• Health officials are inspecting the neighborhood where the person lives and warning neighbors.
• Dengue spreads through mosquito bites, so local mosquito control is the main defense against it taking hold.

Outlook: Expect more mosquito spraying and outreach around the area, with officials watching closely for any sign the virus is spreading on the island.