Regarding picomavirus infections, horses are naturally resistant... | Agrigyan

Arranging the sequence correctly for Point of action of antiviral molecules during the replication cycle of a virus and search for new antiviral compounds:

The correct chronological order is Option 3: (A), (D), (B), (C).

Correct option: (3) (A), (D), (B), (C)

• Culture Conditions for Dermatophytes: Standard diagnostic cultivation of dermatophytes (Microsporum, Trichophyton, and Epidermophyton) from hair, skin scrapings, and crusts utilizes Sabouraud Dextrose Agar (SDA) with chloramphenicol and cycloheximide (actidione).
• Incubation Parameters: The inoculated slants must be incubated at $25^\circ\text{C}$ (room temperature) for 2 to 4 weeks.
• Biological Basis: Dermatophytes are slow-growing filamentous moulds that replicate optimally between $25\text{--}30^\circ\text{C}$. Bacterial contaminants outgrow them at $37^\circ\text{C}$, and colonies require at least 10–21 days to develop characteristic macroconidia, microconidia, and pigment production.

Correct option: (4) 25°C for 2-4 weeks

• Host Range of Microsporum gypseum:
• Microsporum gypseum is a geophilic dermatophyte residing naturally in fertile soil rich in decomposing keratinaceous organic matter.
• Animal Hosts: Animals acquire ringworm by direct contact with contaminated soil or digging; clinical dermatophytosis is frequently diagnosed in horses, dogs, cats, and rodents [Statements A, B, and C].
• Cattle Ringworm Distinctness: In cattle, over $95\%$ of dermatophytosis cases are caused exclusively by the zoophilic dermatophyte Trichophyton verrucosum, with M. gypseum being an exceptionally rare anomaly.

Correct option: (2) (A), (B) and (C) only,

• Matching Dermatophyte Diagnostic Morphology with Species:
• Cigar-shaped macroconidia $\longrightarrow$ (III) Trichophyton mentagrophytes: Produces abundant spherical microconidia in clusters and thin-walled, cigar-shaped to clavate macroconidia with 3--6 cells.
• Chlamydoconidia typically in chains $\longrightarrow$ (I) Trichophyton verrucosum: The causal agent of cattle ringworm; characterized by chains of large chlamydospores on thiamine/inositol-enriched media.
• Substrate hyphae form favic chandeliers $\longrightarrow$ (IV) Trichophyton schoenleinii: Characteristic antler-like, branching hyphal terminal tips resembling chandeliers (favic chandeliers), diagnostic of favus in birds and mammals.
• Pencil-like (long with parallel sides) macroconidia $\longrightarrow$ (II) Trichophyton rubrum: Characterized by long, narrow, thin-walled pencil-shaped macroconidia and wine-red reverse pigment on Sabouraud dextrose agar.
• Conclusion: (A) - (III), (B) - (I), (C) - (IV), (D) - (II) (Option 1).

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