Helminthic and Protozoal Infections Review

Flashcards created for reviewing key concepts related to helminths and protozoa, including transmission, symptoms, diagnosis, and treatments.

What is the definitive host for Diphyllobothrium latum?

Humans.

How is Diphyllobothrium latum transmitted?

Ingestion of plerocercoid larvae in undercooked or raw freshwater fish.

What is the clinical complication associated with Diphyllobothrium latum infection?

Megaloblastic anemia due to vitamin B12 deficiency.

What type of eggs are associated with diagnosing Diphyllobothrium latum?

Oval, yellow-brown operculate eggs in the stool.

What treatment options are available for Diphyllobothrium latum?

Praziquantel and niclosamide.

How does Diphyllobothrium latum cause vitamin B12 deficiency?

It competes for vitamin B12 in the intestine.

What are the symptoms of Diphyllobothriasis?

Often asymptomatic; may include megaloblastic anemia.

How long can the adult Diphyllobothrium latum grow in a host's intestine?

Up to 15 meters.

What is the causative organism for Taeniasis (beef tapeworm)?

Taenia saginata.

How is Taeniasis transmitted?

Ingestion of larvae in undercooked or raw beef.

What is the primary site of infection for Taenia solium?

Intestines.

What condition can Taenia solium cause if eggs are ingested?

Cysticercosis.

What is the clinical picture of neurocysticercosis?

Cystic CNS lesions, seizures.

What imaging findings are associated with neurocysticercosis?

Multiple cystic lesions, often calcified.

What is the classic symptom of active neurocysticercosis?

Seizures.

What is the first-line treatment for neurocysticercosis?

Albendazole.

What is the mechanism of action for Albendazole?

Binds beta-tubulin, inhibits microtubules, and blocks glucose uptake.

What organism causes hydatid cysts?

Echinococcus granulosus.

How is Echinococcus granulosus transmitted?

Ingestion of eggs in food contaminated with dog feces.

What are the characteristic imaging findings of hydatid cysts?

Eggshell calcification.

What is a severe complication of rupturing a hydatid cyst?

Anaphylaxis.

What is the primary treatment for Echinococcosis?

Albendazole or surgical excision.

What is the disease caused by Trichinella spiralis?

Trichinosis.

How is Trichinella spiralis primarily transmitted?

Through undercooked meat, especially pork.

What are common symptoms of trichinosis?

Fever, muscle pain, periorbital edema, myalgia.

What is the treatment for Trichinella spiralis infection?

Bendazoles.

What are the two main species of hookworms?

Ancylostoma duodenale and Necator americanus.

How do hookworms cause anemia?

By sucking blood from the intestinal wall.

What is the classic presentation for hookworm disease?

Iron deficiency anemia.

What is the typical treatment for hookworm infections?

Mebendazole or albendazole.

What is the causative organism of pinworm infection?

Enterobius vermicularis.

What is the diagnostic test for pinworm infection?

Scotch tape test.

What are common symptoms of pinworm infection?

Perianal pruritus, especially at night.

What is the treatment for Enterobius vermicularis?

Mebendazole or pyrantel pamoate.

How do larvae from Strongyloides stercoralis infect humans?

By penetrating the skin.

What syndrome can occur in immunocompromised patients due to Strongyloides?

Hyperinfection syndrome.

What is the primary treatment for Strongyloides stercoralis?

Ivermectin.

How does Ascaris lumbricoides migrate within the body?

Through the lungs after larval hatching.

What treatment is effective against Ascaris lumbricoides?

Albendazole, mebendazole, or pyrantel pamoate.

What are common symptoms of Ascariasis?

Abdominal pain, intestinal obstruction.

What is the primary causative organism for schistosomiasis?

Schistosoma species.

What is the main diagnosis method for schistosomiasis?

Identifying characteristic eggs in stool or urine.

What is the treatment for schistosomiasis?

Praziquantel.

What condition can Ambeiasis cause in humans?

Dysentery and liver abscess.

What is the primary treatment for Entamoeba histolytica?

Metronidazole.

How is Giardiasis transmitted?

Fecal-oral route, often through contaminated water.

What are the symptoms of Giardiasis?

Foul-smelling, greasy diarrhea; bloating.

What is the most common protozoal infection in the United States?

Enterobius vermicularis infection (pinworm).

What is the drug of choice for treating Trichomoniasis?

Metronidazole.

What is a common feature of Cryptosporidium in immunocompromised patients?

Severe watery diarrhea.

What is the primary method for diagnosing Cryptosporidium?

Acid-fast stain.

What alternative treatment can be used for Cryptosporidium in severe disease?

Nitazoxanide.

What are the two major laboratory findings in Hemolytic Uremic Syndrome?

Anemia and thrombocytopenia.

What is a key treatment consideration for EHEC?

Avoid antibiotics, as they may increase the risk of HUS.

What is a typical characteristic feature of C. difficile infection?

Pseudomembranous colitis following antibiotic use.

How is C. difficile primarily diagnosed?

Detecting toxin via PCR.

What is the treatment for severe Clostridium botulinum poisoning?

Antitoxin and respiratory support.

What is the mechanism of action for Pyrantel Pamoate?

Acts as a nicotinic receptor agonist leading to spastic paralysis.

What is the primary use for Ivermectin?

Treatment of Strongyloides and Onchocerca infections.

What is the mechanism of Praziquantel?

Increases permeability of parasite membranes to calcium.

What represents 'rose spots' in typhoid fever?

Faint, red spots that may appear on the abdomen.

What is the first choice treatment for typhoid fever?

Antibiotics are necessary.

How does the Shiga toxin produced by Shigella affect the body?

It inhibits protein synthesis by depurinating adenine in rRNA.

What is the classic presentation of EHEC?

Bloody diarrhea without fever.

How is cholera transmitted?

Fecal-oral route through contaminated water.

What is a classic symptom of cholera infection?

Rice water stools.

What must be done for treatment of severe cholera infection?

Immediate IV fluid resuscitation.

What are common sources of infection for Yersinia enterocolitica?

Contaminated milk or pork.

Which organism is associated with Guillain-Barré Syndrome?

Campylobacter jejuni.

After what event is Clostridium difficile most likely to occur?

After antibiotic therapy.

What is the primary mode of transmission for Leptospira spp.?

Direct contact with contaminated water.

What is the goal when identifying pathogens in a clinical setting?

Prompt and accurate diagnosis to guide effective treatment.