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Rabies (Lyssavirus) Respiratory Syncytial Virus (RSV) Restless Legs Syndrome (RLS) Rett Syndrome Rheumatoid Arthritis (RA) Rhinitis/Sinusitis: Allergic Rhinitis Medicamentosa Rhinitis: Vasomotor River Blindness (Onchocerciasis) Rocky Mountain Spotted Fever (RMSF, Rickettsia rickettsii) Roseola Infantum (Exanthem Subitum) Rotavirus Gastroenteritis Roundworm (Ascariasis) Rubella (German Measles) Rubeola (Red Measles)