Borreliae in Ixodes ricinus ticks feeding on humans
2004
A total of 298 Ixodes ricinus (L.) ticks (Acari: Ixodidae)
feeding on humans in the Czech Republic were tested for
borreliae (Borrelia burgdorferi sensu lato) by darkfield
microscopy between 1997 and 2003. A majority (68%) of the
supplied I. ricinus ticks were nymphs, 25% were females and 7%
were larvae. Overall, 20% of 74 examined females and 9% of 203
examined nymphs (but none of 21 examined larvae) were infected
with borreliae. The proportion of ticks with a high infection
load (>100 spirochetes) was 4% in females and 2% in nymphal I.
ricinus. During the year, the highest numbers and proportions
of infected nymphal and female ticks were taken off humans in
June. Detection of borreliae in the ticks feeding on humans
might be helpful in the prophylaxis of Lyme borreliosis.
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