Excellent overview Mindy!
One tiny omission may be significant. When you mention the clusters in Incline Village and Truckee, you did not mention the less-reported cluster in Yerrington, NV. This is a poor community way down on the desert floor. It differs from Incline Village in geography, demographics, education, economics and access to medical care. It gets overlooked because the sufferers did not have media contacts, or the money to pursue extensive testing not reimbursed by insurance.