Choose a disorder, disease, or parasite of the blood to investigate in your first post. We'll open this up not only to human medicine, but you can also write about a species of animal and their corresponding disorder in veterinary medicine, if you wish. Discuss your selected malady's: Clinical signs. Pathology. Diagnosis. Geological demographics, if applicable (for example, is the disease more prevalent in the US, a specific region of the US, or another country entirely?).