One of the problems is the symptoms are nonspecific, he added.
"This is not something the general public needs to be worried about, but doctors need to follow it," Siegel said. "It's not an epidemic, but it's increasing because ticks are increasing," he explained.
Siegel stressed that both of these diseases are fairly rare, and people should not be overly concerned because their odds of getting either one are very low.
To learn more about insect-borne diseases, visit the U.S. Centers for Disease Control and Prevention.
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