Abstract:
:Cervid babesiosis, caused by the protozoan hemoparasite Babesia odocoilei and transmitted by the blacklegged tick Ixodes scapularis, is an emerging disease of Canadian cervids. This pathogen has not yet been described in humans. Data are lacking on the role of migratory birds in the adventitious spread of Ba. odocoilei-infected ticks, as well as on the infection status of I. scapularis in environments used by susceptible wildlife hosts. Following a high-mortality outbreak of cervid babesiosis at the Toronto Zoo [TZ], the present study was initiated to investigate Ba. odocoilei and other tick-borne pathogens of veterinary and public health importance (Borrelia burgdorferi sensu stricto (s.s.), Anaplasma phagocytophilum, Borrelia miyamotoi, and Babesia microti) in I. scapularis at three sites in southern Ontario, Canada. Blanket dragging for questing ticks yielded I. scapularis from the three sites evaluated: TZ, Point Pelee National Park, and Long Point Bird Observatory [LPBO]. Babesia odocoilei was identified in I. scapularis collected by dragging at the TZ and at LPBO. Borrelia burgdorferi s.s. was identified in I. scapularis at all three sites. Anaplasma phagocytophilum was identified in I. scapularis collected from the TZ. During the springs of 2016 and 2017, 1102 northward-migrating birds were examined for ticks at LPBO. One or more I. scapularis were found on 3.2% of birds (n = 595) in 2016, and 6.7% (n = 507) of birds in 2017. Overall, across both years, 0.2% and 0.5% of birds carried one or more I. scapularis ticks that tested PCR-positive for Ba. odocoilei and Bo. burgdorferi s.s., respectively. These data indicate that Ba. odocoilei-positive I. scapularis are found in southern Ontario, and suggest that bird-borne ticks have the potential to contribute to range expansion of both Ba. odocoilei and Bo. burgdorferi s.s. in Canada.
journal_name
Ticks Tick Borne Disjournal_title
Ticks and tick-borne diseasesauthors
Milnes EL,Thornton G,Léveillé AN,Delnatte P,Barta JR,Smith DA,Nemeth Ndoi
10.1016/j.ttbdis.2019.02.016subject
Has Abstractpub_date
2019-04-01 00:00:00pages
670-676issue
3eissn
1877-959Xissn
1877-9603pii
S1877-959X(18)30398-4journal_volume
10pub_type
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