Dr. Clarissa E Johnson MD

Recommended Articles

• What is Post-Traumatic Stress Disorder?

  Post-traumatic stress disorder, or PTSD, is an anxiety disorder that a person develops after witnessing a very stressful and terrifying event. In most cases, the person must have faced a life-threatening event or an incident in which serious injury was involved. Events that trigger fear,...

• Genes Shown to Influence Disease Course in MS

  Genes are the basic units of information that can be found in nearly every cell in the body. They are made from a chemical called deoxyribonucleic acid, which is widely known as DNA. In a way, genes act as blueprints required for building the bodies and helping them to function. More specifically,...

• Purpura

  PurpuraPurpura refers to purple-colored spots that are usually seen on the skin, including mucous membranes and other organs. It is also called skin hemorrhages or blood spots.Purpura is usually recognized when there is pooling of blood under the skin due to ruptured small blood vessels. The size of...

• Study Finds 3% of Pediatric Non-Hodgkin Lymphoma Cases Are Transplant Recipients

  Lymphoma is a blood cancer that affects both children and adults.Lymphoma begins its growth in the lymphatic white blood cells of the lymph system. This system is a major warrior in fighting off infections and diseases. It is part of the body’s immunity team.The lymph system loops throughout the...

• How Is Leukemia Diagnosed?

  Leukemia in its early stages may present no signs or symptoms, as these only appear when the leukemia cells have taken over a large number of normal blood cells. A person with leukemia is very lucky indeed if early-stage detection occurs incidentally, through a routine blood test or one done for...

• Potential Causes of Leukopenia

  IntroductionA decrease in the number of white blood cells (WBCs) is referred to as leukopenia. There are several causes for leukopenia. It may be due to certain drugs, cancer, radiation and chemotherapy for cancer, stem cell transplant, surgery, steroids, or autoimmune disorders. The immune system...