1.   In older animals the clinical signs and history are similar but laboratory diagnosis is more difficult since faecal egg counts and plasma pepsinogen levels are less reliable.

2.   Faecal egg counts are a useful aid to diagnosis, although faecal cultures are necessary for generic identification of larvae.

3.   This will terminate the PPR in faecal egg counts prior to moving the ewes and lambs to a safe pasture.

4.   Since much of the pathogenic effect occurs within the prepatent period, the faecal egg count may be very low.

5.   It should be emphasised however that high faecal egg counts may be found in apparently healthy animals.