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====Introduction====

====Introduction====

''P. equorum'' is a nematode that primarily affects younger horses, usually under two years of age, as their immune response is not as developed as older horses.   

''P. equorum'' is a nematode that primarily affects younger horses, usually under two years of age, as their immune response is not as developed as older horses.   

==== Morphology ====

====Identification====

*Stout worms, up to 50cm long.

''P. equorum'' is a large stout nematode, with the female capable of growing up to 40cm in length. The adults have a mouth surrounded by three large lips.  The egg is spherical, brown and has a thick outer shell.

*Three large lips around mouth.

==== Life-Cycle ====

==== Life-Cycle ====