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​Symptoms and Signs – Differential Diagnosis of Right Axis Deviation
• Dextrocardia
• Lateral myocardial infarction
• Left posterior fascicular block
• Mechanical shifts or emphysema causing a vertical heart
• Normal variation
• Pulmonary embolism
• Right ventricular hypertrophy
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​Symptoms and Signs – Differential Diagnosis of Rocky Mountain Spotted Fever
• Acute abdomen
• Bacterial endocarditis
• Bronchitis
• Connective tissue disorders
• Disseminated gonococcal infection
• Drug hypersensitivity reactions
• Ehrlichiosis
• Enteroviral infection
• Gastroenteritis
• Idiopathic thrombocytopenic purpura
• Immune complex vasculitis
• Infectious mononucleosis
• Influenza A
• Kawasaki’s disease
• Leptospirosis
• Lyme disease
• Measles
• Meningococcemia
• Pneumonia
• Rheumatic fever
• Rickettsialpox
• Rubella
• Scarlet fever
• Secondary syphilis
• Sepsis
• Thrombotic thrombocytopenic purpura
• Toxic shock syndrome
• Typhoid fever
• Typhus
• Viral hepatitis
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​Symptoms and Signs – Differential Diagnosis of Rosacea
• Acne vulgaris
• Carcinoid flush
• Contact dermatitis
• Drug eruption
• Facial sarcoidosis
• Idiopathic facial flushing
• Mastocytosis
• Photodermatitis
• Seborrheic dermatitis
• Systemic lupus erythematosus (SLE)
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​Symptoms and Signs – Differential Diagnosis of Rubella
• Allergic reaction
• Congenital syphilis
• Cytomegalovirus, enterovirus
• Herpes simplex
• Kawasaki’s disease
• Other viral infections by enteroviruses, adenoviruses, human parvovirus B19, measles
• Scarlet fever
• Toxoplasmosis
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​Symptoms and Signs – Differential Diagnosis of Salivary Gland Enlargement
• Acromegaly
• Anorexia/bulimia
• Chronic pancreatitis
• Cirrhosis
• Diabetes mellitus
• Idiopathic
• Infection (mumps, bacterial infection, HIV infection, TB)
• Medications (e.g., phenylbutazone)
• Neoplasm
• Sarcoidosis
• Sialolithiasis
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