**5. Strains of** *E. granulosus*

Species of *E. granulosus* is divided into several strains such as G1–G10 and these strains have a high degree of adaptation to their hosts, as these strains are named according to the names of their intermediate hosts that play an important role in the continuity of the life cycle of these strains. These strains vary in shape, rate of development, pathogenicity, and geographical extent of their presence: G1 is found in sheep, G2 in Tasmania sheep, and G3 in buffalo. These strains all fall within the *E. granulosus* species, and G4 strain in equine is therefore called *E. equinus*; G5 in cows is called *E. ortleppi*; G6 in camels; G7 in pigs; G9, which is characterized weak, has been isolated from cystic disease in human cases in Poland; G7, G8, and G9 may fall into *E. canadensis*, and some researchers consider the G9 strain a type of G7 strain in pigs [12].
