Preface -- 1 Introduction -- 2 Brief History of Microbiology -- 2.1 In Jainism: Mahavira -- 2.2 Marcus Terentius Varro -- 2.3 Golden Age of Islamic Civilization: Avicenna and Al-Razi -- 2.4 Girolamo Fracastoro -- 2.5 Antonie van Leuwenhoek and the Invention of the Microscope -- 2.6 Birth of Bacteriology: Louis Pasteur and Robert Koch -- 2.7 History of Virology: Dmitrij Iwanowski -- 3 General Considerations on Infectious Diseases -- 3.1 Definition -- 3.2 Classification -- 3.3 Pathophysiology -- 3.4 Transmission -- 3.5 Epidemiology -- 3.6 Prevention -- 4. Infectious Diseases of the Scalp and Hair -- 4.1 Bacterial Diseases. - 4.1.1 Superficial Ostiofolliculitis -- 4.1.2 Impetigo -- 4.1.3 Folliculitis Decalvans -- 4.1.4 Gram-Negative Folliculitis -- 4.1.5 Acne Necrotica -- 4.1.6 Furuncle, Furunculosis, and Carbuncle -- 4.1.7 Trichobacteriosis Palmellina -- 4.1.8 Gonococcal Scalp Abscess of the Newborn -- 4.1.9 Necrotizing Fasciitis of the Scalp -- 4.1.10 Scalp Actinomycosis -- 4.1.11 Cutaneous Granular Bacteriosis -- 4.2 Fungal Diseases -- 4.2.1 Tinea Capitis -- 4.2.2 Tinea Favosa -- 4.2.3 Pityrosporum-Associated Scalp Conditions -- 4.2.4 Piedras -- 4.2.5 Fungal Tropical Diseases -- 4.3 Viral Diseases -- 4.3.1 Varicella Zoster -- 4.3.2 Herpes Folliculitis -- 4.3.3 Human Papilloma Virus-Associated Akanthopapilloma -- 4.3.4 Molluscum Contagiosum -- 4.3.5 Cytomegalovirus -- 4.3.6 Kaposi Sarcoma -- 4.4 Parasitic Disease and Infestations -- 4.4.1 Demodicosis -- 4.4.2 Crusted Scabies with Scalp Involvement -- 4.4.3 Pediculosis Capitis -- 4.4.4 Phthiriasis pubis -- 4.4.5 Tick Bite and Borreliosis -- 4.4.6 Cutaneous Leishmaniasis -- 4.4.7 Furunculoid Myiasis -- 4.4.8 Delusion of Parasitosis -- 4.4.9 Morgellons Disease -- 5. The Hair and Scalp in Systemic Infectious Disease -- 5.1 Bacterial Diseases -- 5.1.1 Syphilis -- 5.1.2 Tuberculosis -- 5.1.3 Leprosy -- 5.1.4 Hair Loss in Septic Shock and Toxic Shock Syndrome -- 5.2 Fungal Diseases -- 5.2.1 Septicemic Candida Albicans -- 5.2.2 Cryptococcosis -- 5.3 Viral Disease -- 5.3.1 AIDS -- 5.3.2 Dengue Hemorrhagic Fever -- 5.3.3 Chikungunya Virus Disease -- 5.3.4 COVID-19 -- 6. Diagnostic Techniques -- 6.1 Clinical Examination -- 6.2 Dermoscopy -- 6.3 Wood Lamp Examination -- 6.4 KOH (Potassium Hydroxide) Mounted Preparation -- 6.5 Microbiological Culture Systems.-6.6 Light and Electron Microscopy -- 6.7 Polymerase Chain Reaction -- 7 Posology, Efficacy, and Safety and Efficacy of Antiinfectious Treatments -- 7.1 Antibiotics -- 7.2 Antimycotics -- 7.3 Virostatics -- 7.4 Antiparasitic Agents -- 8. Concluding Remarks -- Subject Index.