This companion volume focuses on viral, fungal, and parasitic pathogens and the specialized approaches needed to detect and manage them. It details viral life cycles, antifungal pharmacology, parasitology diagnostics, and outbreak investigation methods. Infection-control chapters cover transmission dynamics, hospital epidemiology, and practical prevention strategies for healthcare settings. Emphasis on emerging pathogens and laboratory biosafety prepares readers for contemporary clinical challenges. Clinical scenarios and flowcharts simplify complex decision-making for diagnostics and containment.