Ascarirds are

Ascarids mature in the

In pig livers, the inflammation heals by fibrosis, giving rise to the so-called milk spot lesions (see Fig. 7.152) that cause the organ to be condemned by meat inspectors as unfit for human consumption.

Life cycle of Toxocara canis

Life cycle of Toxocara cati

is a parasite of cats and dogs in cooler climates of the world, which they acquire by the ingestion of infective eggs or paratenic hosts

Toxocara is a genus of ascaridoids that as adults parasitize the of various mammals.

The pups whimper and shriek almost continuously and adopt a peculiar straddle-legged posture of the hindlimbs when standing or walking.

a parasite of canids, is found in fibrous nodules in the wall of the esophagus or stomach

If ingested by a coprophagous beetle, this vermiform embryo develops into a larva capable of infecting dogs and a broad range of paratenic hosts, including lizards, chickens, and mice.

Intermediate host of Spirocerca lupi

Spirocerca lupi is found in

are parasites of the conjunctival and lachrymal sacs of domestic animals.

Intermediate host of Thelazia spp.

causes the ophthalmitis of “river blindness.”

Which is nearer on the surface of the skin?

Parafilaria are

Dirofilaria immitis are

These worms are parasites of the pulmonary arteries

Human infection is abortive and results in radiographic changes referred to as “coin lesions,” which have been misinterpreted as representing neoplasia and can lead to unnecessary thoracic surgery

Adult heartworms are found in the

Summer bleeding

These parasites live in the subcutaneous and intermuscular connective tissues and, when sexually mature, produce crops of pea-sized nodules that bleed through a tiny pore.

Intermediate hosts of Parafilaria

Also, the first-stage larvae of all these genera have a little stylet called an onchiostyle.

THe final host is always infected by eating a firststage larva, even if a paratenic host is involved

The giant kidney worm of carnivorans, swine and sometimes humans.

Minks are the principal definitive hosts of this nematode.

Dioctophyme renale eggs are passed in

Intermediate host of Dioctophyme renale

Dioctophyme renale adult is found in

Members of this superfamily are distinguished by their stichosome esophagus, which consists of a capillary tube surrounded by the bodies of a single-file column of gland cells called stichocytes

Trichinelloidea are

Adult Trichinella are found in

However, in the unique life history of, both adult and larval stages occur in sequence in the same host, the tiny adults lying within the villi of the small intestine and the larvae they produce becoming curled up in cysts in the striated muscle

The adult body is whip-shaped; the anterior end fine, hair-like, and embedded in the wall of the large intestine (see Fig. 8.76); and the posterior end stout and lying free in the lumen

Eggs passed in the feces contain only a single cell and are not infective.

An infective first-stage larva develops inside the egg in about 1 month but does not hatch unless swallowed by a suitable host.

Adult Trichuris is found