Definitions of antimicrobial control terms:

• Antisepsis is the application of antimicrobial chemical agents to living tissues (skin, mucous membranes) to inhibit or destroy pathogens.
• Sterilization is the absolute destruction or elimination of all forms of microbial life, including vegetative bacteria, viruses, fungi, and highly resistant bacterial endospores, from inanimate objects or surfaces.
• Disinfection is the destruction of vegetative pathogenic microorganisms on inanimate objects, but it typically does not destroy bacterial spores.
• Cleaning is the mechanical removal of visible organic matter and debris.

Classification of veterinary surgical suture materials:

• Polyglactin 910 (Vicryl) is a synthetic, braided multifilament, absorbable suture.
• Polyamide (Nylon) is a synthetic, non-absorbable suture (available as monofilament or braided).
• Polydioxanone (PDS / PDS II) is a synthetic, monofilament, absorbable suture material prepared from the polyester poly(p-dioxanone), degraded by slow hydrolysis with prolonged tensile strength retention.
• Polypropylene (Prolene) is a synthetic, monofilament, non-absorbable suture.

In cattle, 'cud dropping' (failure to hold or re-swallow the regurgitated bolus of ruminal digesta during rumination, allowing it to drop from the mouth) is the classic pathognomonic clinical sign of pharyngeal paralysis (glossopharyngeal and vagal nerve damage, botulism, rabies, or gutteral pouch/pharyngeal trauma).

• Pharyngeal paralysis prevents normal coordination of the pharyngeal constrictor muscles to form and re-swallow the cud bolus.
• Esophageal obstruction (choke) causes inability to swallow saliva and tympany, not cud dropping.
• Acute pharyngitis produces dysphagia, salivation, and head extension with pain on palpation.
• Esophageal ulcers lead to painful swallowing (odynophagia).

Avian nutritional deficiencies and etiologies:

• Zinc deficiency in poultry leads to severe scaling and hyperkeratosis of the legs/feet ('scaly leg' / dermatosis) and enlarged hocks -> Correct combination.
• Perosis (slipped tendon) is caused by deficiency of manganese or choline (as well as biotin, folic acid, or nicotinic acid) -> Correct combination.
• Curled-toe paralysis in chicks is the classic pathognomonic lesion of Vitamin B2 (Riboflavin) deficiency causing sciatic nerve myelin sheath degeneration -> Correct combination.
• Pullet disease (bluecomb disease / avian infectious enteritis) is a metabolic/infectious disorder of laying pullets of complex etiology, NOT caused by Vitamin E deficiency. Vitamin E deficiency causes encephalomalacia (crazy chick disease), exudative diathesis, and nutritional muscular dystrophy -> Incorrect combination.