21.   The most frequent clinical sign is a marked loss of weight.

22.   During the period of maturation of these hypobiotic larvae, clinical signs of acute haemonchosis may occur and in the ewes this often coincides with lambing.

23.   The history and clinical signs are often sufficient for the diagnosis of the acute syndrome especially if supported by faecal worm egg counts.

24.   This is based on clinical signs, seasonal occurrence of disease and, if possible, lesions at post-mortem examination.

25.   This is based on a history of access to permanent pig pastures and the clinical signs.

26.   In severe infections, diarrhoea is the most prominent clinical sign.

27.   This lesion is largely responsible for the first clinical signs.

28.   Although the clinical signs are abating the bronchi are still inflamed and residual lesions such as bronchial and peribronchial fibrosis may persist for several weeks or months.

29.   Usually the clinical signs, the time of the year and a history of grazing on permanent or semi-permanent pastures are sufficient to enable a diagnosis to be made.

30.   These drugs have been shown to be effective against all stages of lungworms with a consequent amelioration of clinical signs.