Table 1.

Levels of infection for four genospecies of B. burgdorferi sensu lato in I. ricinus collected in 1995 and 1996 and in xenodiagnostic ticks

Tick developmental stageCollection seasonNo. examined% Infected with:
B. burgdorferi
sensu lato
B. burgdorferi
sensu stricto
B. gariniiB. afzeliiB. valaisianaB. garinii + B. valaisianaUntypeable
borreliaef
Questing larvaeSummer ’951001.001.00000
Questing nymphsa Spring, summer, and autumn ’953802.1NAg NANANANANA
Spring ’951003.003.00000
Spring ’961004.01.02.001.000
Questing adultsAutumn ’9610016.01.010.0d 06.0d 3.0e 2.0
Larvae fed on rodentsb Spring ’967711.31.300000
Nymphs fed on pheasantsSpring ’96122c 56.6037.7d 027.0d 10.6e 2.5
  • a The mean level of infection ofB. burgdorferi sensu lato in all questing nymphs was 2.6% (15 of 580 nymphs).

  • b Xenodiagnostic larvae were introduced to 47 wild rodents trapped alive.

  • c Number of pheasant-derived engorged nymphs tested.

  • d Ticks had single and mixed infections.

  • e Ticks had only mixed infections.

  • f The borreliae did not hybridize with species-specific DNA probes.

  • g NA, not applicable.