Medical Entomology MCQs 2 — Parasitology OmpathStudy

Medical Entomology MCQs 2 — Parasitology Section A: Cockroaches Q1. Which of the following best describes the role of cockroaches in disease transmission? A. Biological vectors B. Mechanical vectors C. Definitive hosts D. Intermediate hosts Answer: B. Mechanical vectors Cockroaches mechanically transmit pathogens through contamination of food, utensils, and surfaces. --- Q2. Which species of cockroach is most commonly found in hospitals and food establishments? A. Periplaneta americana B. Blatta orientalis C. Blattella germanica D. Blaberus giganteus Answer: C. Blattella germanica The German cockroach is the most common domestic species, especially in warm indoor environments. --- Q3. Cockroaches are important in medical entomology mainly because: A. They bite humans causing lesions B. They act as intermediate hosts for Plasmodium C. They mechanically carry pathogens on their bodies D. They inject toxins through bites Answer: C. They mechanically carry pathogens on their bodies Their legs and body surfaces can carry bacteria, fungi, and parasites from contaminated areas. --- Q4. The ootheca of cockroaches refers to: A. Larval stage B. Egg case C. Adult exoskeleton D. Feeding organ Answer: B. Egg case Female cockroaches produce oothecae that contain multiple eggs, protecting them until hatching. --- Section B: Non-Biting and Myiasis-Producing Flies Q6. Which genus is commonly associated with facultative myiasis in humans? A. Glossina B. Musca C. Calliphora D. Culex Answer: C. Calliphora Blowflies such as Calliphora can cause facultative myiasis in neglected wounds. --- Q7. Musca domestica is medically important because: A. It transmits malaria B. It serves as an intermediate host for filarial worms C. It mechanically transmits pathogens D. It produces larval toxins Answer: C. It mechanically transmits pathogens The common housefly carries pathogens on its body and regurgitates contaminated material. --- Q8. The term "accidental myiasis" refers to: A. Larval infestation occurring in tissues intentionally B. Larvae accidentally ingested or entering orifices C. Obligatory infestation by larvae D. Vector transmission by flies Answer: B. Larvae accidentally ingested or entering orifices It occurs when fly eggs or larvae enter tissues or cavities unintentionally. --- Q9. The screwworm fly (Cochliomyia hominivorax) causes: A. Facultative myiasis only in animals B. Obligatory myiasis in living tissues C. Mechanical transmission of bacteria D. Malaria Answer: B. Obligatory myiasis in living tissues Its larvae actively invade healthy tissues, causing severe lesions. --- Q10. The housefly transmits pathogens mainly through: A. Saliva B. Regurgitation and fecal contamination C. Blood feeding D. Vertical transmission Answer: B. Regurgitation and fecal contamination Flies vomit and defecate on food, contaminating it with microbes. --- Q11. Which fly species is known as the "tumbu fly" in Africa? A. Dermatobia hominis B. Cordylobia anthropophaga C. Stomoxys calcitrans D. Musca domestica Answer: B. Cordylobia anthropophaga This species causes cutaneous myiasis in humans and animals in tropical Africa. --- Q12. Cordylobia anthropophaga infestation typically presents as: A. Painless ulcers B. Boil-like lesions with central breathing pores C. Severe systemic illness D. Diffuse rashes Answer: B. Boil-like lesions with central breathing pores Larvae develop under the skin causing furuncular lesions with visible openings. --- Q13. Dermatobia hominis transmits its larvae to humans through: A. Direct oviposition on skin B. Using other insects as carriers C. Mechanical contamination of food D. Blood meals Answer: B. Using other insects as carriers Eggs are attached to blood-sucking insects; larvae enter skin when the insect feeds. --- Q14. Myiasis can be prevented by: A. Allowing flies to access wounds B. Wearing open clothes C. Covering wounds and maintaining hygiene D. Avoiding bathing Answer: C. Covering wounds and maintaining hygiene Good personal and wound hygiene prevents fly oviposition. --- Section C: Tabanidae Q16. The characteristic feature of tabanid flies is: A. Long proboscis adapted for sucking nectar B. Scissor-like mouthparts for painful bites C. Reduced wings D. Non-functional mouthparts Answer: B. Scissor-like mouthparts for painful bites Female Tabanidae cause painful bites by cutting the skin to pool blood. --- Q17. Tabanid flies are important vectors of: A. Malaria B. Loa loa C. Trypanosoma cruzi D. Schistosoma haematobium Answer: B. Loa loa Chrysops species transmit Loa loa filarial worms in West and Central Africa. --- Q18. Only female Tabanidae bite because: A. Males lack mouthparts B. Females require blood for egg development C. Males are nocturnal D. Females live longer Answer: B. Females require blood for egg development The blood meal provides protein needed for egg maturation. --- Q19. The larvae of Tabanidae typically develop in: A. Human tissues B. Stagnant water and moist soil C. Inside mosquitoes D.