Dr. David S Chan M.D.

What is a vaccine?Vaccines are products that enable a person to develop immunity against certain diseases. A vaccine can be given through needle injections, by aerosol, or by mouth. The polio vaccine is given in the form of mouth drops that contain live but weakened organisms. The vaccine gets into...

What is Candida?Candida is a form of yeast or fungus, which lives in the mouth or intestines. The main role of Candida, when in proper levels, is to aid in digestion and nutrient absorption. However, when there is an overproduction of Candida, it breaks down the wall of the intestines and...

Atrial fibrillation is a heart condition that occurs due to an irregular or abnormal beating of the heart. It is a serious medical condition that can result in fatality if not treated.An abnormal heartbeat takes place when the pace of the atria and that of the ventricles are not in harmony. The...

Researchers have identified a new way to identify the father from the fetal DNA by the eighth week of pregnancy. This new method is reported in the, New England Journal of Medicine. Peter Benn, PhD, director of the diagnostic medical genetics laboratories at the University of Connecticut Health...

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...

Bacteria are microorganisms that thrive in the environment, but they are not always harmful. There are a number of vital functions that are performed by bacteria, which are essential for our day-to-day living. However, sometimes, these bacteria may leave harmful strains on or inside our body. When...