We both looked up information about treatment and prevention. From the Cochrane Library we added and cited this paragraph -
In a trial with 15 children being infected with La Crosse viral encephalitis were treated at certain phases with ribavirin (RBV). RBV appeared to be safe at moderate doses. At escalated doses of RBV, adverse events occurred and then the trial was discontinued. Nonetheless, this was the largest study of antiviral treatment for La Crosse encephalitis.
5. McJunkin, JE (October 2011). "Safety and pharmacokinetics of ribavirin for the treatment of la crosse encephalitis.". The Pediatric infectious disease journal. 30 (10). Retrieved 5 December 2016.
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"Prevention measures against LACV include reducing exposure to mosquito bites. Use repellent such as DEET and picaridin, while spending time outside, especially at during the daytime - from dawn until dusk. Aedes triseriatus mosquitoes that transmit (LACV) are most active during the day. Wear long sleeves, pants and socks while outdoors. Ensure all screens are in good condition to prevent mosquitoes from entering your home. Aedes triseriatus prefer treeholes to lay eggs in. Also, remove stagnant water such as old tires, birdbaths, flower pots, and barrels".
"La Crosse Encephalitis: Prevention". Centers for Disease Control and Prevention. Retrieved 6 December 2016.
There is also a few statistics that I believe could be useful. According to the CDC, between 2004 and 2013 there were 787 total cases of La Crosse encephalitis and 11 deaths in the U.S. [2]
CDC. "La Crosse virus disease cases and deaths reported to CDC by year and clinical presentation, 2004-2013" (PDF). Retrieved 6 December 2016.
Looking at the distribution of cases across the United States by state, between 2004 and 2013 the most cases of La Crosse encephalitis was in North Carolina. North Carolina had 184 total cases, followed by Ohio with 178 total cases. [3]
CDC. "La Crosse virus disease cases reported to CDC by state, 2004–2013" (PDF). CDC. Retrieved 8 December 2016.