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https://en.wikipedia.org/wiki/Immune_system

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https://symptoms.webmd.com/cold-flu-map/keep-immune-system-healthy

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Your immune system defends you against the viruses that cause colds and flu. These steps can help support your immune system so it's ready to fight those viruses.
1. Eat plenty of fruits, vegetables, and whole grains.
2. Get at least 30 minutes of exercise most days of the week.
3. Get enough sleep.
4. Wash your hands.
5. Do not share eating utensils or drink after other people.
6. Keep up with your vaccinations.
7. Almost everyone who's at least 6 months old should get a flu vaccine every year.
8.Keep your weight healthy.
9.Don't drink too much alcohol and don't smoke.

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Your immune system is your body's defense against infection and illness. It recognizes the cells that make up your body, and will try to get rid of anything unfamiliar. It destroys germs (bacteria and viruses) and parasites. But this defense system can also cause problems.

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Lymphatic System: Helping Defend Against Infection

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Lymphatic System: Helping Defend Against Infection

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The spleen plays multiple supporting roles in the body. It acts as a filter for blood as part of the immune system. Old red blood cells are recycled in the spleen, and platelets and white blood cells are stored there. The spleen also helps fight certain kinds of bacteria that cause pneumonia and meningitis. One problem that can happen is an enlarged spleen. If it becomes severe, your spleen can rupture and cause a sudden, sharp pain on the left side of your upper abdomen.

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Our bone marrow produces blood cells, called red blood cells, platelets, and white blood cells. Inside the marrow, blood cells start off as young, immature cells called stem cells. Once they develop, blood cells do not live for a long time inside our bodies.

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Lymph vessels route lymph fluid through nodes throughout the body. Lymph nodes are small structures that work as filters for harmful substances. They contain immune cells that can help fight infection by attacking and destroying germs that are carried in through the lymph fluid. When you have mono, your lymph nodes might be swollen, or your glands might be swollen.

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The thymus gland, despite containing glandular tissue and producing several hormones, is much more closely associated with the immune system than with the endocrine system. The thymus serves a vital role in the training and development of T-lymphocytes or T cells, an extremely important type of white blood cell.

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Tonsils have an important job. They help fight off germs that come in through your nose and mouth. ... Common signs of tonsillitis include fever, extremely sore throat, bad breath, swollen neck glands and inflammation of the tonsils.When you have mono tonsils play a big part. White Patches start to appear. You might have Strep Throat.

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The immune system is made up of specialized cells and proteins.

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The immune system is made up of specialized cells and proteins.

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Some of these specialized cells include white blood cells such as lymphocytes (B cells and T cells) and phagocytes (neutrophils, monocytes, and macrophages). White blood cells are produced in the bone marrow. The complement system is a group of proteins found in the blood that are critical in defense against infection. When the immune system is missing any of these parts, people are vulnerable to specific types of diseases.

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One level of the bodies defense involves white blood cells (leukocytes) that travel through the bloodstream and into tissues, searching for and attacking microorganisms and other invaders.
When needed to defend the body, the white blood cells are mobilized, mainly from the bone marrow. They then move into the bloodstream and travel to wherever they are needed.