Tick-Borne diseases can be transmitted via non-systemic (NS) transmission.This occurs when tick gets the infection by co-feeding with infected ticks onthe same host resulting in a direct pathogen transmission between the vectors,without infecting the host. This transmission is peculiar, as it does notrequire any systemic infection of the host. The NS transmission is the mainefficient transmission for the persistence of the Tick-Borne Encephalitis virusin nature. By describing the heterogeneous ticks aggregation on hosts through a\hyphenation{dynamical} bipartite graphs representation, we are able tomathematically define the NS transmission and to depict the epidemiologicalconditions for the pathogen persistence. Despite the fact that the underlyingnetwork is largely fragmented, analytical and computational results show thatthe larger is the variability of the aggregation, and the easier is for thepathogen to persist in the population.
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