Human cysticercosis (Cysticercosis cellulosae) is caused by the larval stage of_____________?
Show answer Hide answer
Answer: A. T. Solium
Explanation
Human cysticercosis is caused by accidental ingestion of Taenia solium tapeworm eggs shed in human feces. The ingested eggs hatch in the intestine, releasing larvae that migrate through tissues to form cysticerci. Taenia solium larval cysts commonly localize in human skeletal muscle, subcutaneous tissue, and the central nervous system. Taenia solium is the pork tapeworm whose adult stage resides exclusively in the human intestinal tract. Neurocysticercosis occurs when parasite larvae invade the brain parenchyma, leading to seizures and neurological deficits. Fecal-oral transmission from human carriers or autoinfection leads to cysticercosis rather than eating undercooked pork.
Echinococcus granulosus is a distinct tapeworm species that causes hydatid cyst disease in humans and livestock. Taenia saginata is the beef tapeworm that causes intestinal taeniasis but does not cause invasive human cysticercosis. None of the listed extra options apply because Taenia solium is the direct causative organism for cysticercosis.
Related questions
Q1. Which microorganism is a normal commensal inhabitant of the human throat and tonsils______________?
Show answer Hide answer
Answer: A. Alpha hymolytic streptococci (S. viridans)
Streptococcus viridans exhibits alpha-hemolysis and colonizes human oral mucosal surfaces natively. Throats and tonsils harbor these commensal bacteria as part of normal upper respiratory flora. Option A correctly identi...
Q2. What laboratory culture medium is standard for growing Candida species_________________?
Show answer Hide answer
Answer: B. Saboraud’s medium
Sabouraud agar is the standard mycological medium formulated specifically to cultivate fungi like Candida species. Nutrient composition and acidic pH levels favor fungal growth while inhibiting competing bacterial specie...
Q3. What is the cough plate technique used to isolate________________?
Show answer Hide answer
Answer: B. Pertussis
The cough plate technique was historically designed to isolate Bordetella pertussis by capturing expelled respiratory droplets. Patients would cough directly onto specialized growth medium plates held a short distance fr...
Q4. The process of disinfection eliminates what level of microbial contamination from surfaces______________?
Show answer Hide answer
Answer: A. Vegetative forms
Disinfection successfully eliminates vegetative microbial forms from inanimate environmental surfaces. Bacterial spores possess thick protein coats enabling them to survive standard disinfection protocols. Option A accur...
Q5. Dermatophyte fungi are pathogenic agents infecting________________?
Show answer Hide answer
Answer: C. Nails, hair and skin
Dermatophyte fungi are keratinophilic pathogens that infect superficial tissues including the skin, hair, and nails. Enzymes produced by these fungi break down keratin proteins found exclusively in external body structur...
Q6. A delayed-type hypersensitivity response in the tuberculin skin test is mediated by_______________?
Show answer Hide answer
Answer: B. T lymphocytes
A tuberculin skin test represents a classic delayed-type hypersensitivity reaction mediated by sensitized T lymphocytes. Injected mycobacterial antigens are recognized by memory T cells that migrate to the site and relea...