Does working outdoors with cattle create repeated opportunities for tick exposure even without a noticed bite or rash?

Outdoor cattle work can repeatedly place a person in tick habitat and is associated with markers of prior Borrelia exposure. For this 83-year-old man, neither failure to notice a bite nor absence of a recognized erythema migrans (EM) rash meaningfully excludes prior tick exposure.

Occupational exposure evidence

• A 2022 systematic review found that outdoor workers had higher odds of Borrelia seropositivity than comparison groups (odds ratio 1.93, 95% CI 1.15–3.23). The pooled seropositivity estimate among farmers was 14%, although results varied substantially across studies.
• In Polish farmers, reporting multiple tick bites—rather than a single bite—was associated with greater Borrelia seroreactivity, consistent with cumulative occupational exposure.
• Among Colombian cattle farmers, longer duration of work on cattle ranches was associated with B. burgdorferi IgG seropositivity. IgG indicates prior immune recognition/exposure and does not establish active Lyme disease.

Why exposure can go unrecognized

• Only approximately 25–30% of people with early Lyme disease recall a tick bite. Nymphal ticks are small, and attachment may occur in concealed areas, making bites easy to miss.
• EM occurs in roughly 80% of early Lyme cases, but it may be subtle, atypical, located where it is not seen, or simply not recognized. Therefore, no noticed rash does not rule out exposure or infection.

Clinical interpretation

• Occupational history raises the pretest plausibility of past tick exposure, but serology alone cannot diagnose current illness. Any evaluation for active tick-borne disease should be guided by compatible objective clinical findings and appropriately interpreted testing, particularly when symptoms are nonspecific.

Bottom line

• Working outdoors with cattle supports a meaningful possibility of repeated tick exposure, even without a recalled tick bite or recognized EM rash; those absences do not exclude prior exposure or infection.