Immunity Introduction When it comes to the immune system, two words that are most important are antigens and antibodies. To put it simply, antigens are any foreign bodies or toxins that initiate an immune response in the body. Antibodies are proteins produced by the body to fight against these antigens. Let us just assume our body’s immune system and its response as an interesting drama that plays as long as we live. Now, certainly, it should have some main characters without which the drama never unfolds. White blood cells (WBC) , also known as leukocytes are the key factors or main characters that help build and maintain a strong immune system in our body. They circulate through the blood vessels and lymphatic vessels and do a constant patrol every time so that our body is always ready to fight any foreign body. WBCs are mainly 2 types: Phagocytes Lymphocytes Phagocytes As the name suggests, these cells engulf and absorb the pathogens, just like that! Remember the terms Neutrophils
Both flu (influenza) and cold are caused by viruses, and they can have similar symptoms. So how do we know if a person has the flu or a bad cold? In this article, we explain the differences. Cold and influenza are the most common illnesses in humans, according to an article published in The Lancet Trusted Source . Every year, 5-20 percent of the population of America develop flu symptoms. The main difference between cold and flu is that, generally, symptoms of the flu are usually a lot more severe. Each year, more than 200,000 people are hospitalized because of flu complications; flu is responsible for around 23,600 deaths every year. Fast facts on colds vs. flu : Colds and flu share many of the same symptoms; the major difference being flu is often worse, and accompanied by a high fever . According to the Centers for Disease Control and Prevention (CDC), the average adult will have 2-3 colds every year. The rhinovirus is the most common cause of cold. The d