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Detection of Tick-Borne Pathogens in Lambs Undergoing Prophylactic Treatment Against Ticks on Two Swedish Farms
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Detection of Tick-Borne Pathogens in Lambs Undergoing Prophylactic Treatment Against Ticks on Two Swedish Farms
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Journal Article
Detection of Tick-Borne Pathogens in Lambs Undergoing Prophylactic Treatment Against Ticks on Two Swedish Farms
2018
Overview
Tick-borne pathogens (TBPs), especially
, cause disease in grazing livestock. Tick prophylaxis is, therefore, a routine practice in sheep flocks in Sweden, especially in central, southern, and coastal areas of the country where ixodid ticks (
and
) are present. In the present study, the status of infection by
and other TBPs in lambs treated with tick prophylaxis has been assessed serologically and with polymerase chain reaction (PCR). Blood samples (
= 78) from lambs (
= 20) subjected to regular tick prophylactic treatment (flumethrin, Bayticol
) at two sites in different regions in Sweden (Östergötland, Gotland) were collected on four occasions from May until July 2013. The severity of clinical signs in
infected animals is known to differ between these two regions. In total, 20% of blood samples were PCR-positive for
. Serological analyses showed that 33% of all collected samples were positive for
, while 2.5% were positive for
s.l. and 13% for tick-borne encephalitis virus (TBEV). Percentages of lambs positive were 75 and 45% for
antibodies and DNA, respectively, while 10 and 45% were serologically positive for
s.l. and TBEV, respectively. Sequencing of partial 16S rRNA genes from
PCR positive samples revealed presence of
in all animals in Östergötland, while sequences consistent with
as well as
and
were found on the island of Gotland. This is the first report of the occurrence of the latter two species in Sweden.
