Breaking the host specificity barrier to invasion of parasites.
D000818:Animals; D006801:Humans; D010271:Parasites / Q000254:growth & development; D010272:Parasitic Diseases; D012988:Soil Microbiology; D013045:Species Specificity; D014122:Toxoplasma / Q000472:pathogenicity; D014123:Toxoplasmosis / Q000453:epidemiology; D014871:Water Microbiology; D015047:Zoonoses / Q000453:epidemiology