 Similarity between host species  influences the likelihood that a pathogen can be transmitted between them  ;
<meaning-changed>  Similarity between host species  influences the likelihood that a pathogen can be transmitted between them  ;
 ; for example, a reservoir species may transfer the virus to a vector species, which in turn transfers the virus to humans. The degree of phylogenetic relatedness between host species influences the likelihood that a pathogen can be transmitted between them ;