Mon Jun 8, 2015 6:41 am (PDT) . Posted by:
"Rick Laferriere" ri_lymeinfo
*Prevalence of /Borrelia burgdorferi/ in adult female ticks
(/Ixodes scapularis/), Wisconsin 2010–2013*
Lloyd W. Turtinen, Alyssa N. Kruger and Madeleine M. Hacker
/Journal of Vector Ecology/, Volume 40, Issue 1, pages
195-197, June 2015.
http://doi.org/10.1111/jvec.12152
The incidence of Lyme disease in some areas of Wisconsin,
U.S.A. has more than tripled since 1991. Tick abundance and
the prevalence of /Borrelia burgdorferi/ in questing ticks
are essential components of risk assessment for Lyme disease
borreliosis.
Published surveys completed overseas in various countries
(Germany, Japan, China, Norway) have shown prevalence rates
of /Borrelia/ spp. infection ranging from about 30-40% in
adult /Ixodes/ spp. In Wisconsin, unpublished surveys also
reveal that as many as 40-50% of /Ixodes scapularis/ adults
in some areas may be infected. In recently published studies
from the eastern United States, prevalence rates of /B.
burgdorferi/ in adult /I. scapularis/ ranged from 27% to
45.2%. In Wisconsin, the prevalence of /B. burgdorferi/ in
/I. scapularis/ nymphs collected from managed red pine
forests from 2009 to 2013 was approximately 30%.
To estimate the prevalence of adult questing ticks carrying
the Lyme disease bacterium in this pilot study, we randomly
collected 341 questing adult female /Ixodes scapularis/ from
known and suspected tick habitats throughout regions of
Wisconsin during the springs of 2010 through 2013. Nymphal
and adult tick activity has been reported to be the highest
in May and June. These locations generally were wooded with
a medium-dense tree canopy and contained leaf litter. Sites
with tall grasses on the wooded edges with agricultural
plains were also chosen. The extent of urbanization was not
recorded but in general was minimal.
Ticks were collected by walking the sampling area and
removing ticks from the collector's clothing or using a
flannel drag cloth. The same sites were not necessarily
sampled each year as different individuals did the sampling
each year in order to maximize the number of sampling
locations (average of 24 sites each year). Ticks were
collected from 21 counties in primarily west-central
Wisconsin. Only adult female ticks (no nymphs or adult
males) were assayed in this study.
http://doi.org/10.1111/jvec.12152
Free, full text (pdf file, 342 KB):
http://onlinelibrary.wiley.com/doi/10.1111/jvec.12152/epdf
(/Ixodes scapularis/), Wisconsin 2010–2013*
Lloyd W. Turtinen, Alyssa N. Kruger and Madeleine M. Hacker
/Journal of Vector Ecology/, Volume 40, Issue 1, pages
195-197, June 2015.
http://doi.org/10.1111/jvec.12152
The incidence of Lyme disease in some areas of Wisconsin,
U.S.A. has more than tripled since 1991. Tick abundance and
the prevalence of /Borrelia burgdorferi/ in questing ticks
are essential components of risk assessment for Lyme disease
borreliosis.
Published surveys completed overseas in various countries
(Germany, Japan, China, Norway) have shown prevalence rates
of /Borrelia/ spp. infection ranging from about 30-40% in
adult /Ixodes/ spp. In Wisconsin, unpublished surveys also
reveal that as many as 40-50% of /Ixodes scapularis/ adults
in some areas may be infected. In recently published studies
from the eastern United States, prevalence rates of /B.
burgdorferi/ in adult /I. scapularis/ ranged from 27% to
45.2%. In Wisconsin, the prevalence of /B. burgdorferi/ in
/I. scapularis/ nymphs collected from managed red pine
forests from 2009 to 2013 was approximately 30%.
To estimate the prevalence of adult questing ticks carrying
the Lyme disease bacterium in this pilot study, we randomly
collected 341 questing adult female /Ixodes scapularis/ from
known and suspected tick habitats throughout regions of
Wisconsin during the springs of 2010 through 2013. Nymphal
and adult tick activity has been reported to be the highest
in May and June. These locations generally were wooded with
a medium-dense tree canopy and contained leaf litter. Sites
with tall grasses on the wooded edges with agricultural
plains were also chosen. The extent of urbanization was not
recorded but in general was minimal.
Ticks were collected by walking the sampling area and
removing ticks from the collector's clothing or using a
flannel drag cloth. The same sites were not necessarily
sampled each year as different individuals did the sampling
each year in order to maximize the number of sampling
locations (average of 24 sites each year). Ticks were
collected from 21 counties in primarily west-central
Wisconsin. Only adult female ticks (no nymphs or adult
males) were assayed in this study.
http://doi.org/10.1111/jvec.12152
Free, full text (pdf file, 342 KB):
http://onlinelibrary.wiley.com/doi/10.1111/jvec.12152/epdf
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