Table 3. Prevalence of Borrelia burgdorferi infection in ticks removed from birds, by site of origin and date of capture, southwest suburban Chicago, Illinois, USA, 2005–2010*.
| Tick species | Larva |
Nymph |
|||||||
|---|---|---|---|---|---|---|---|---|---|
| No. pools (no. larvae) | % Infected (MIP) | Birds with infected larvae, site, date | No. tested | % Infected (95% CI) | Birds with infected nymphs, site, date | IGS strain (RST group) | ospC strain | ||
| Haemaphysalis leporispalustris | 65 (277) | 0 | NA | 34 | 2.9 (0.2–17.1) | RWBL, SC site, 2007 Jun 6 | NA | NA | |
| Ixodes dentatus | 6 (17) | 0 | NA | 0 | NA | NA | NA | NA | |
| I. scapularis | 6 (22) | 16.7 (4.5) | SWTH, WW site, 2006 May 23 | 6 | 50 (14.0–86.1) | AMRO, 1 site, 2007 Jul 18; AMRO, PHN site, 2010 Jun 22; BLJA, PHN site, 2009 Jun 15 | 2 (2); 28 (3); 14 (2) | H, T, A3 | |
*MIP, minimum infection prevalence; IGS, B. burgdorferi 16S-23S rRNA intergenic spacer ribotype; RST, ribosomal spacer type 1, 2, or 3; ospC, inferred outer surface protein C allele based on linkages reported by Travinsky et al. (23); NA, not applicable; RWBL, Red-winged blackbird; SC, Saint Casimir Cemetery; SWTH, Swainson’s thrush; WW, Wolfe Wildlife Refuge; AMRO, American robin; PHN, Palos Hills Natural; BLJA, Blue jay.