Toxascaris leonina

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Also known as: Toxascaris limbata

Scientific Classification

Class Nematoda
Superfamily Ascaridoidea

The biology of T. leonina is generally similar to that of T. canis, except:

  • it infects both felidae and canidae
  • in the final host:
    • there is no prenatal transmission
    • there is no transmammary transmission
    • there is no hepato-tracheal migration
  • in 'paratenic' hosts:
    • develops to L3 in tissues (the 'paratenic' hosts therefore are really facultative intermediate hosts).

Transmission is via ingestion of the embryonated egg or an infected 'paratenic' host. The zoonotic potential is uncertain, but T. leonina is not thought to be as hazardous as T. canis.