Cestodes Quiz: Tapeworms Anatomy and Life Cycle

<p>The scolex acts as a holdfast, attaching at the anterior end. (B)</p> Signup and view all the answers

<p>It has armed scolex with hooklets. (B)</p> Signup and view all the answers

<p>They have centrally located genital pores. (A)</p> Signup and view all the answers

<p>30 ft (B)</p> Signup and view all the answers

<p>Ova are shed in feces and infective to the intermediate host upon passage. (D)</p> Signup and view all the answers

<p>Praziquantel (A)</p> Signup and view all the answers

<p>Condemnation of carcasses by inspectors (B)</p> Signup and view all the answers

<p>Feeding pets raw fish (B)</p> Signup and view all the answers

<p>A larval stage infective to the definitive host (A)</p> Signup and view all the answers

<p>Strobila (C)</p> Signup and view all the answers

<p>Armed and unarmed scolex (C)</p> Signup and view all the answers

<p>Oncosphere (B)</p> Signup and view all the answers

<p>Rabbit (B)</p> Signup and view all the answers

<p>4 to 8 weeks (B)</p> Signup and view all the answers

<p>Sheep (D)</p> Signup and view all the answers

<p>Alveolar hydatidosis (D)</p> Signup and view all the answers

<p>4 to 6 weeks (A)</p> Signup and view all the answers

<p>Hydatid cyst (B)</p> Signup and view all the answers

<p>Taenia taeniaeformis (A)</p> Signup and view all the answers

<p>Pancreas (D)</p> Signup and view all the answers

<p>Requires the consumption of the intermediate host by the definitive host (D)</p> Signup and view all the answers

<p>Recurrent infestations (D)</p> Signup and view all the answers

<p>Identification of adult worms (A)</p> Signup and view all the answers

<p>Copepods (C)</p> Signup and view all the answers

<p>Ingestion of the second intermediate host (D)</p> Signup and view all the answers

<p>Proglottids around the rectum (C)</p> Signup and view all the answers

<p>By size and shape (A)</p> Signup and view all the answers

<p>All of the above (D)</p> Signup and view all the answers

<p>Separation along the longitudinal axis (C)</p> Signup and view all the answers

<p>Practicing good hygiene after dog feces contact (B)</p> Signup and view all the answers

<p>Copepods (D)</p> Signup and view all the answers

<p>6 weeks (C)</p> Signup and view all the answers

<p>They are hermaphroditic and contain both male and female reproductive organs. (A)</p> Signup and view all the answers

<p>Oncosphere → 1st Stage Larva → 2nd Stage Larva (C)</p> Signup and view all the answers

<p>Treat for fleas simultaneously. (B)</p> Signup and view all the answers

<p>Cysticercoid (C)</p> Signup and view all the answers

<p>The bladder is digested away, and the scolex attaches to the gut wall. (C)</p> Signup and view all the answers

<p>Taenia spp. have single pores in their proglottids. (C)</p> Signup and view all the answers

<p>1st stage larva (oncosphere or hexacanth embryo). (B)</p> Signup and view all the answers

<p>They have a double pore at the lateral midpoint. (B)</p> Signup and view all the answers

<p>4 weeks (B)</p> Signup and view all the answers

<p>2nd Stage Larva (C)</p> Signup and view all the answers

Requires an intermediate host (IH) to complete its development.

True tapeworms with suckers on their scolex and laterally located genital pores on proglottids.

The head of a tapeworm, used for attaching to the host's intestine.

Segment of a tapeworm containing reproductive organs.

Organism that harbors the larval stage of a parasite.

A pseudo tapeworm with two bothria on its scolex and central genital pores.

Tapeworms that can infect humans.

Tapeworms don't have a digestive system; they absorb nutrients through their tegument.

A mature proglottid filled with eggs, ready to detach and be passed out of the host's body.

The first stage larva of a tapeworm, enclosed in a shell and infective to the intermediate host.

The second stage larva of a tapeworm, typically found in the tissues of mammals.

The second stage larva of a tapeworm, typically found in the tissues of arthropods.

The common name for the second stage larva of a tapeworm, which is ingested by the final host.

A tapeworm commonly known as the 'flea tapeworm' that infects dogs and cats, with a life cycle involving fleas.

A group of tapeworms that infect humans, with adults having rectangular proglottids and single genital pores.

A tapeworm that infects dogs, with a life cycle involving rabbits as intermediate hosts.

The time it takes for a parasite to reach maturity and start producing eggs in the final host.

This tapeworm infects rabbits (intermediate host) and dogs (definitive host). The cycle starts with eggs released by proglottids in dog feces, which are ingested by rabbits. Cysticerci develop in rabbit tissues, and then dogs get infected by eating raw or undercooked rabbit.

These tapeworms primarily infect sheep as intermediate hosts. They are transmitted through the ingestion of infective eggs in canine feces. Dogs become definitive hosts after consuming raw sheep tissues.

Common in cats (definitive host) that hunt mice (intermediate host). The life cycle is similar to Taenia pisiformis, with eggs released by cats, ingested by mice, and then cats becoming infected by consuming infected mice. Recurrent infestations are typical.

These are zoonotic tapeworms, meaning they can infect humans. Adults are tiny, with only three proglottids: immature, mature, and gravid. The larval stage develops into hydatid cysts in the intermediate host's body.

This tapeworm's definitive host is primarily dogs, but can include other wild canids. The intermediate host is typically sheep, but also includes other ruminants, pigs, horses, and even humans. Eggs are released in dog feces, ingested by the intermediate host, and hydatid cysts form in various tissues.

The disease caused by Echinococcus granulosis infection in the intermediate host, often sheep or humans. Hydatid cysts can grow large and cause significant damage due to their space-occupying nature.

This tapeworm is similar to E. granulosus, but its intermediate hosts are mainly mice, occasionally humans. It causes alveolar hydatidosis, a fatal disease characterized by the continuous growth of alveolar hydatid cysts in various organs, resembling malignant growth.

The life cycle is completed when a dog (or other definitive host) consumes an infected intermediate host (sheep, etc.).

Zoonotic parasites are those that can infect both animals and humans. This means humans can become infected with the parasite by contacting infected animals or consuming contaminated food or water.

Certain tapeworms require specific medications like Praziquantel and Epsiprantel for treatment. Other drugs like Ivermectin and Fenbendazole may be less effective against specific tapeworm species.

Cysticerci or hydatid cysts found in livestock can cause lesions, leading to condemnation of entire carcasses by meat inspectors, causing economic losses.

To prevent cestode infections in pets, eliminate fleas, prevent hunting, avoid feeding raw meat or fish, and practice good hygiene.

To prevent zoonotic cestode infections, avoid eating fleas, raw meat and fish, prohibit pets from hunting, and maintain good hand hygiene.

The anterior end of a tapeworm responsible for attachment to the host's intestine.

The chain of proglottids that make up the body of a tapeworm, responsible for reproduction and containing reproductive organs.

Adult worms must be identified for diagnosis, as ova cannot be differentiated from Taenia spp.

A wild cycle involving moose, wolves, sled dogs, and humans. Dogs become infected by scavenging wild game and shed infective oncospheres in their feces. Humans can get infected by handling contaminated dog feces.

Humans can serve as an intermediate host for Echinococcus spp. Hydatid cysts can be fatal if they grow in the body.

To prevent infection, avoid feeding raw meat to pets and do not let cats or dogs hunt.

Humans can become infected with Diphyllobothrium latum by consuming raw fish.

The first intermediate host for Spirometra spp. is a copepod. The second intermediate host can be various animals, including amphibians, reptiles, birds, and mammals, even humans.

Spirometra spp. can be diagnosed by identifying the large operculated ova and the proglottids that have a medial pore.

Common signs of cestode infection in animals include proglottids around the rectum or on bedding, scooting, licking the anal area, unthriftiness, and mild diarrhea.