Built for medical residents managing real infectious diseases decisions, this handbook connects host defense, microbial pathogenesis, diagnostic test selection, antimicrobial pharmacotherapy, resistance mechanisms, and prevention to the clinical moment when empiric therapy must become targeted care. It moves from fever, sepsis, pneumonia, meningitis, gastrointestinal infection, UTI, SSTI, bone and joint infection, and endocarditis into pathogen-directed chapters on bacteria, mycobacteria, viruses, HIV, fungi, parasites, zoonoses, and travel-associated disease. The Culture-to-Coverage Decision Atlas gives the reader a repeatable framework for choosing specimens, estimating the pathogen field, recognizing resistance signals, escalating when delay is dangerous, and narrowing when evidence permits. • Build the microbiology workup — match blood, CSF, respiratory, stool, urine, tissue, bone, joint, device, and abscess specimens to the syndrome before treatment obscures the diagnosis. • Treat fever and sepsis with structure — identify when broad empiric therapy is urgent and when source control, imaging, or culture interpretation should drive the next move. • Decode antimicrobial resistance — recognize MRSA, VRE, ESBL, AmpC, CRE, MDR/XDR nonfermenters, azole resistance, and antiviral resistance as bedside coverage signals. • Manage pathogen-directed disease — translate gram-positive, gram-negative, anaerobic, mycobacterial, viral, fungal, parasitic, tick-borne, zoonotic, and travel pathogens into actionable therapy pathways. • Navigate immunocompromised-host infection — adjust suspicion for HIV, neutropenia, oncology, transplant, pregnancy, older adults, and critical illness. • Use prevention as clinical care — apply vaccination, isolation precautions, outbreak response, post-exposure prophylaxis, and antimicrobial stewardship before infection spreads. Choose this handbook to make infectious diseases reasoning faster, cleaner, and safer for the patients whose cultures, syndromes, and risks do not wait.
