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Presents treatment options for a broad spectrum of medical disorders. Discussions include etiology, epidemiology, and pathogenesis, symptoms and signs,Diagnosis of Viral Infections · Influenza Influenza is a viral respiratory infection causing fever, coryza, cough, headache, and malaise. · Norovirus Some viruses cause nonspecific symptoms, including fever, malaise, headaches, and myalgia. Transmission is usually by an arthropod vector. (See also Arbovirus, The MSD Veterinary Manual has been a trusted source of animal health information for students and practicing veterinarians. Overview of Viral Infections - Learn about the causes, symptoms, diagnosis & treatment from the MSD Manuals - Medical Consumer Version.