There can be no argument that the incidence of tick borne diseases is exploding; Lyme, Babesiosis, Human Granulocytic Anaplasmosis, Powassan Encephalitis, and other very bad things.
https://www.cdc.gov/ticks/diseases/index.htmlThe why is of course dependent on one's agenda ie "it's climate change and we only have 12 more years to live"

Interesting short articles suggesting that forest fragmentation with increasing populations of white-footed mouse may be part of the culprit, and we might be to blame
https://www.nsf.gov/news/special_reports/ecoinf/lyme.jsp https://www.johnshopkinshealthreview.com...me-so-prevalentWhy Lyme is exploding a California is unclear...oh, it's climate change too!
https://www.ucsf.edu/news/2018/05/410401/lyme-disease-rise-expert-explains-why