From Texas Standard:
West Nile virus made big headlines in Texas in 2012. But the truth is, it probably infects thousands of people here each year, even though the actual number of confirmed cases tends to be quite low. That’s because an estimated 80 percent of those infected don’t have any symptoms and never see a doctor. Others will become sick with flu-like symptoms and recover. But for a small number of people each year, West Nile causes permanent disability, paralysis and death.
In 2012, 68-year-old Chuck Yarling was an avid runner, biker and swimmer who’d competed in more than 100 triathlons. In fact, he’d competed in one just weeks before he fainted in his apartment on an August afternoon. He awoke days later in a rehabilitation hospital a different man.