There are new concerns about previously rare types of tick-borne diseases being seen more frequently in the United States. The blacklegged tick, for example, not only spreads Lyme disease it can also transmit a serious virus called powassan that may have killed one man and made another sick in New Jersey.
CBS News' Dr. David Agus told "CBS This Morning" part of what's behind the rise in ticks in parts of the U.S. where they are traditionally found is climate change.
"The weather is changing. Climate is changing and there are more mice, there are more food for the ticks," he said. "As reforestation happens, as climate change happens, different areas of the country are getting more of these."
Though there were about 60,000 cases of tick-borne diseases reported last year, Agus estimates that the real number of cases is probably over 300,000.