There are nine U.S. residents being monitored for the illness across six states, though none have shown any signs of illness.

In 2002, Zermeño found out he contracted hantavirus after cleaning the family house following the death of his mother and sister. He had been exposed to rodent droppings and became infected.

According to the CDC, 102 passengers and 13 crew were reported sick.

People who eat eggs at least five times a week appear to have a lower risk of Alzheimer's disease but experts caution that there are more factors to take into account.