Skin and Soft Tissue Infections

A 42-year-old male farmer from rural Maharashtra presents with a 3-day history of rapidly spreading erythema, edema, and warmth over his left leg following a minor cut while working in the field. On examination, he has a temperature of 38.5°C, tachycardia (HR 110/min), and poorly demarcated erythema with brawny edema extending from the ankle to mid-thigh. There is no fluctuance or abscess formation. Blood cultures are pending. Which is the most likely causative organism and the immediate management?

A 38-year-old diabetic woman from Delhi presents with a 5-day history of pain, swelling, and foul-smelling discharge from her left foot following a puncture wound from a contaminated needle. On examination, she has a temperature of 39.2°C, tachycardia (HR 115/min), and a necrotic ulcer with surrounding erythema and crepitus on palpation. Blood glucose is 320 mg/dL. Gram stain of the wound discharge shows mixed flora including gram-positive cocci and gram-negative rods. What is the most appropriate initial management?

Which organism is the most common causative agent of necrotizing fasciitis Type I?

A 28-year-old woman presents with a 3-day history of progressive swelling, erythema, and pain in her right arm following a minor cat scratch. On examination, she has a small punctate wound with surrounding cellulitis extending 8 cm from the site. She is afebrile with normal vital signs. There is tender regional lymphadenopathy. Blood cultures and wound culture are pending. What is the most likely causative organism and the recommended empiric antibiotic?

A 42-year-old man presents to the emergency department with a 6-hour history of severe pain and swelling in his left leg following a puncture wound from a rusty nail while gardening. On examination, he has marked erythema, edema, and crepitus extending from the foot to mid-calf. His temperature is 38.5°C, heart rate 110/min, and blood pressure 100/65 mmHg. Laboratory investigations show WBC 18,000/μL, creatinine 1.8 mg/dL, and CK 2400 U/L. What is the most likely diagnosis?