Dr. William A Greisner MD

Pollen grains from flowers are the main cause for spring allergies. When pollen enters an individual's nasal cavities, particularly in those who are allergic to them, it stimulates the immune system to react in an allergic response. Antibodies produced by the immune system start attacking the...

The pathogens involved in pneumonia are bacteria, virus, fungus, rare parasites, and other microorganisms. Virus is the most common cause of pneumonia among babies and children. Adults with weak immune systems are vulnerable to bacterial pneumonia.Pneumonia Causing pathogens:The pathogens that cause...

IntroductionA wasp is an insect that belongs to the order of Hymenoptera and suborder Apocrita. Wasps can be identified from bees and ants through their physical and behavioral characteristics. They have a slimmer and smooth body with few hairs. Wasps are also parasitic and predatory in nature....

IntroductionLupus is a chronic autoimmune disease. It is a complex disease characterized by inflammation and many other symptoms. In lupus, the body's immune system attacks its own healthy tissues and causes inflammation and swelling. It also damages other organs in the body. People with lupus tend...

In the early 19th to the 20th century, parents would have been surprised to know that future generations would be free from childhood diseases. Diphtheria was then one of the most common diseases that took the lives of thousands of children, while polio left thousands of children crippled. Measles...

What is the immune system and how does it work?The immune system is regarded as the natural defense system in your body. The immune system, together with a network of cells and tissues, as well as body organs, protects your body against harmful foreign invaders or substances. Examples of foreign...