Eisen’s research noted pathogens other than Lyme in ticks in the USA.
In the United States, the blacklegged tick, Ixodes scapularis, is a vector of seven human pathogens, including those causing:
- Lyme disease
- Anaplasmosis
- Babesiosis
- Borrelia miyamotoi disease
- Powassan virus disease
- Ehrlichiosis
- (Bartonella?)
In my definitive textbook, The Diagnosis and Treatment of Bartonella, Bartonella has 12 insect carriers and roughly infects about 20% of humans. I would add that one.
Reference
Eisen RJ, Eisen L. The Blacklegged Tick, Ixodes scapularis: An Increasing Public Health Concern. Trends Parasitol. 2018 Apr;34(4):295-309. doi: 10.1016/j.pt.2017.12.006. Epub 2018 Jan 11. PMID: 29336985; PMCID: PMC5879012.