I got attacked by at least 40 mosquitos including the black ones with white stripes at a party last weekend: I have a stiff neck, sick, probably have West Nile, malaria and God knows what else including heartworms.
There are no heartworms in San Francisco, Pacifica and Brisbane. Heartworms need THREE WEEKS of CONTINUOUS heat to breed...and that simply cannot happen in San Francisco, Pacifica and Brisbane. Imagine that. Dogs are safe from heartworms in that one area of the planet. Yay, fog.