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The geographic range and occurrence of tick species is dynamic. This has important public health implications due to important tick species that can transmit pathogens. This study presents a retrospective review of tick genera recovered from humans and submitted for identification in Alberta, Canada, over a 19-year period. The total number of ticks and proportion of genera were analyzed over time. Molecular testing for a number of pathogens associated with  Ixodes scapularis  and  I. pacificus  was conducted. A total of 2,358 ticks were submitted between 2000 and 2019, with 98.6% being acquired in Alberta. The number of ticks submitted increased significantly over time ( p  &lt; 0.0001).  Dermacentor  ticks were the most abundant genus, followed by  Ixodes  and  Amblyomma . There was a significant decrease in the proportion of  Dermacentor  ticks between 2013 and 2019 ( p  = 0.02), with a corresponding increase in the proportion of  Ixodes  ticks over the same time ( p  = 0.04). No statistically significant change in seasonality was identified.  Borrelia burgdorferi  was detected in 8/76 (10.5%; 95% CI 5.4–19.4%) of all  I. scapularis  and  I. pacificus  ticks submitted. This translated to a  B. burgdorferi  positivity of 0.35% (95% CI 0.15–0.68%) among all ticks received.  Dermacentor  species (especially  D. andersoni ) remains the most common tick feeding on humans in Alberta. Small numbers of vector species (including  I. scapularis/pacificus ) are encountered annually over widely separated geographic areas in the province. The risk of exposure to tick-borne pathogens (e.g. Lyme disease) in Alberta remains low.

Epidemiology of ticks submitted from human hosts in Alberta, Canada (2000–2019)