| http://www.w3.org/ns/prov#value | - In one biotope, the annual and seasonal variability of R. helvetica infections of the different tick stages was determined and potential reservoir hosts, such as rodents including their ticks and fleas and other wildlife were studied.ResultsCollection of ticksTo investigate the presence of rickettsiae and the possible emergence of Rickettsia species in the Dutch tick population, 1735 ticks were co
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