Lungworm of pigs
Adults: slender white nematodes, 6cm
Eggs: small with L1; irregular exterior; 51-63 x 33-42um > Strongyloides spp.
LC: Direct and Indirect. Eggs containing L1 are passed up he trachea, swallowed, and excreted in the feces, ingested by earthworm, develop to L3 (may stay there for years), earthworm consumed by pig, L3 released and migrate to mensenteric lymph nodes and molt, and from there they migrate via the lymphatic route to the lung; earthworm may not be obligatory.
SOI: Bronchi and bronchioles
PATH/CS: lung migrations cause lesions, peribronchial lymphoid hyperplasia, chronic bronchitis, emphysema, marked coughing, nasal discharge and dyspnea, fatal cases can occur
Dx: eggs with L1 in fecal examination
Tx: young pigs severely affected, longlasting exposure due to the earthworm reservoir, several anthelmintics approved.