Table 1.

Case definitions of dictyocaulosis, ostertagiosis and unspecified PGE in cattle recorded in the Veterinary Investigation Diagnosis Analysis database

Parasitic disease	Case definition
Dictyocaulosis	Relevant clinical history and/or gross pathology and either (a) demonstration of Dictyocaulus viviparus in the bronchial tree, (b) detection of first stage larvae (L1) in the faeces or (c) histopathology
Ostertagiosis	Relevant clinical history and significant numbers (approximately 20 000 or more) of Ostertagia ostertagi adults/larvae in the abomasum
Unspecified PGE	Relevant clinical history and/or gross pathology and/or histopathology and either (a) detection of worms in gastrointestinal tract, (b) FEC (usually >500 egg per gram (EPG) in individual faecal egg count (FEC) examinations) or (c) larval culture/identification

FEC, fecal egg count; PGE, parasitic gastroenteritis.