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Asnos y Caballos. Ovejas y Cabras. Caninos y Felinos. Syngamus trachea. Estas estrongilosis son frecuentes y cosmopolitas. Son relativamente menos importantes en los paises calidos. Syngamus spp. Strongylidae o Singamidae. Syngamus o.

Especie: laringeus. Examen del moco nasal. Dyctiocaulus spp. Metastrongylus spp. Los cerdos infestados con tales larvas adquieren de ellas la influenza, y se indica , que la larva puede portar el virus de la fiebre porcina, de tal suerte que requiere alguna forma de stress para provocar la patogenicidad del virus. V erme pulmonar Metastrongylus apri, M. Metastrongylus salmi. Otros vermes pulmonares.

En Colombia existen pocos repor tes. Protostrongilidosis Gusanos pulmonares. Protostrongylidae: Formas larvarias con colas afiladas, puntudas y con espinas. Machos mm. Hembras 19 —23 mm.

Gruesos, blancos. Se relaciona con la presencia de caracoles y babosas hospederos intermediarios de las formas larvarias 57 especies. Caracoles: Monacha spp. Babosas: Milax spp. Heteroxene sin fases de vida libre. Control Verminosis Pulmonares. Paragoniums kellicotti. Life cycle diagram Paragonimus is a trematode that may inhabit the lungs of a variety of mammals.

Paragonimus kellicotti is the species of importance to domestic animals in the U. Like most flukes, the adult stage is not highly host specific and P. The mink is regarded as being the usual final host in the U. Louisiana and the Great Lakes area have a high incidence of wild animal infection but P. The life cycle involves a snail intermediate host and a crayfish second intermiate host.

Another species, Paragonimus westermani Oriental Lung Fluke is a serious parasite of man in the Orient. Paragonimus egg. Adult flukes in the lung releas e operculated eggs into the bronchial tree which are subsequently coughed up, swallowed and shed in the feces. Paragonimus eggs are yellow to brown in color, by M in size and have an operculum set into a characteristic col1ar-like thickening.

Paragonimus kellicotti Miracidia. After weeks development within eggs in an aquatic environment, short-lived, ciliated miracidia emerge which must find a suitable snail intermediate within 24 hours or perish. Snail intermediate host. In the U. Miracidia initiate a complex asexual reproductive phase in snail tissues and produce larg e numbers of free swimming cercariae. Cercariae penetrate through th e exskeleton of the crayfish second intermediate host, encyst as metatacercaria and await ingestion by the final host.

Crayfish Cambarus spp. A number of species of crayfish in the U. Metacercaria in crayfish heart muscle.

Metacercariae become infective to the fina l host in a period of several weeks. An immature fluk e is present within the cyst wall at this time. Definitive host. After ingestion, met acercariae excyst in the intestine, young flukes penetrate the gut wall into the peritoneal cavity and then migrate across the diaphragm to the p1eura1 cavity. They migrate in lung tissues for weeks before pairing up cysts which are radiographically visi ble 4 weeks after infection.

Mature flukes are found in fibrous pulmonary cysts 5 to 6 weeks afer infection at whic h time patency occurs. Cysts of Paragonimus are usually found close to the lung surface and appear as nodular elevated masses of cm beneath the pleura. Migration of young flukes through thc pleura is sometimes marked by small hemorrhages which progress to small scars. During migration through the lung parenchyma, young flukes pair up and are gene rally found with two adults within individual cysts.

Paragonimus adults in cross section and microscopic in canine lung. Adult parasites are often found in what appears to be a greatly dilated bronchiole surrounded by reddish fluid containing fluke eggs and cellular debris. A patent fistulous communication to the bronchial tree is present for passage of eggs. Eggs may escape to lung tissues and cause granulomatous inflammation, particullarly where there is no communication for escape of eggs to the bronchio1es.

Eggs sometimes find their way into thc general circulation and are fi1tered out in the major capillary beds, inciting small foci of granulomatous inflammation in other areas of thc body.

Infections may be diagnosed by finding the very characteristic eggs using routine fecal flotation procedures. Eggs of many fluke species sink in flotation media. Eggs can also be re adily detected by tracheal swabs or tracheal washes. Diagnosis may also be made by radiography, particularly when eggs are not being passed.

Cysts are seenas circumscribed pulmonary soft tissue densities. On rare occasions, cysts are contained in a radiolucent area an air bubble in the cyst. Paragonimiasis is usually manifested clinically by relatively mild respiratory distress and a persistant hacking cough.

Lung sounds are often normal unless many flukes are present and the pleura is involved. In heavy infections, the exertion will initiate a coughing seizure. Signs are likely to be more severe during the migratory and growth phase as flukes establish themselves.

Hemoptisis is sometimes seen at this stage. Fatal cases have been reported due to pulmonary hemorrhage or secondary infection following simultaneous entry of a number of flukes into the lungs. Pneumothorax may occur if subpleura1 cysts rupture. B ithionol no longe r manufactured. Nodular radiographic leasion re solve within 2 months after successful therapy. There are three species of nematode lungworms in the genus Filaroldes Family Metastrongylidae which infect dogs:.

Filaroldesosleri, F. All are of relatively low incidence and are generally considered to be of low pathogenicity. The life cycle for Filaroides spp. It is thus di rectly infective when passed in feces or sputum. Life cycle possibly evolved for transmission via fecal-oral route or by regurgitated food by carnivores in neonatal period. Filaroides osleri. The worms are small in size 0. Females deposit larvae encapsulated by a single shell membrane which hatch immediately, move up the tr achea, and are then swallowed.

Infected dogs may have a persistant, harsh cough, especially after exercise, and sometimes have gradual emaciation and loss of condition. Litters of pups typically develop signs of disease after 10 weeks post- partum. Notch tailed larvae. Large lesions may be visible radigraphica1ly, ZNSO 4 sp. The larvae may be differentiated from other parasites ea. Strongyloides stercoralis by tbc presence of an S-shaped notch in th e tail.

Direct bronchoscopic examination of nodules or radi ography may also lead to a diagnosis. These species occur in the lung parenchyma in lesions that are evident as blister-like granulomatous foci beneath the pleura or as scattered foci through deeper lung tissues. Tissue reaction occurs due to congregated nests of adult and larval forms.

Infections are generally regarded as asymptomatic, although fatal granulomatous pneumonia has been reported. Hirth and Hottendorf Vet. This parasite may become endemic in kennels, reducing the value of animals I. Treatment and Control.


6 Enfermedades Parasitarias SR



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