The major risk factor is Tobacco use. There has been a large influenza outbreak in Alaska. Influenza in the summer is rare, but large groups can sometimes create epidemics. Most victims were touring Alaska on cruise ships or overland expeditions. Also in this weeks MMWR , Ciguatera food poisoning.
Dinoflagellates produce the toxin, which herbivorous fish consume.
They are then eaten by predatory fish such as barracuda. The toxin concentrates in the fatty tissue as it moves up the food chain. While it does no harm to the fish, it causes nausea, diarrhea and neurological symptoms in humans. SOS repair 's molecular mechanism is examined. SOS repair has been know about for 20 years, but this is a nice summary of its function.