Clinical Parasitology

• Correct Matching Analysis:
• Microcercous cercariae: (I) Paragonimus westermanii — Characterized by a very short, rudimentary, knob-like tail armed with a small stylet.
• Gymnocephalous cercariae: (II) Fasciola gigantica — Possesses an unbranched, simple cylindrical tail, without a stylet or fin-fold membranes, and prominent cystogenous gland cells.
• Parapleurolophocercous cercariae: (III) Euryhelmis squamula — Possesses a tail provided with dorsoventral and lateral cuticular fin-folds and pigmented eyespots.
• Xiphidiocercariae: (IV) Dicrocoelium dendriticum — Possesses a prominent anterior stylet (spine) embedded in the oral sucker and a simple cylindrical tail, aggregating into slime balls in terrestrial snails.
• Summary: Matching yields (A)-(I), (B)-(II), (C)-(III), (D)-(IV) (Option 1).

Correct option: (1) (A) - (1), (B) - (I), (C) - (Ill), (D) - (IV)

• Chemical Control via Ingestion Baits:
• House flies (Musca domestica): Possess sponging/lapping mouthparts and exhibit active scavenging for carbohydrates and proteins.
• Poison baits formulated with feeding attractants (sucrose, fly sex pheromone (Z)-9-tricosene / Muscalure) and stomach insecticides (methomyl, spinosad, imidacloprid) are exceptionally effective against house flies.
• Fleas, lice, and bugs have piercing-sucking mouthparts and are strict obligate hematophages (feed exclusively on host blood); they do not consume poison baits.
• nalysis:
• (House flies): Correct.

Correct option: (4) House flies

• Semiochemical Classification: Kairomones are trans-specific chemical messengers (allelochemics) emitted by an organism of one species that evoke a physiological or behavioural response in an individual of another species, conferring an adaptive benefit to the recipient.
• Veterinary Context: Host body odours, carbon dioxide, octenol, and sebum emitted by cattle serve as kairomones detected by ticks, horseflies (Tabanus), and tsetse flies to locate their hosts.
• Definitions of Alternative Semiochemicals:
• Allomone: Benefits the emitting species to the detriment of the receiver (e.g., defensive chemical secretions).
• Synomone: Confers mutual benefit to both emitter and receiver (e.g., floral scents attracting pollinators).
• Pheromone: Acts strictly intraspecifically between individuals of the same species.

Correct option: (2) Kairomones