ANATOMY

Detailed explanation-1: -Even after you start feeling better, your immune system is still working. Your body makes proteins called antibodies against the virus that made you sick. If you get exposed to the virus again, your body will remember how to fight it off. That said, there are hundreds of viruses that cause colds.

Detailed explanation-2: -People with a weak immune system have a higher risk of experiencing frequent infections and severe symptoms. They may be more prone to pneumonia and other conditions. Bacteria and viruses, including the virus that causes the infection COVID-19, can have a devastating effect on a person with a compromised immune system.

Detailed explanation-3: -The immune system’s job: defend against disease-causing microorganisms. Its goal is to keep us healthy. The immune system is a vast and complex interconnected network of many different organs, cells and proteins that work together to protect the body from illness.

Detailed explanation-4: -Blood tests. Blood tests can determine if you have typical levels of infection-fighting proteins (immunoglobulins) in your blood and measure the levels of blood cells and immune system cells. Having numbers of certain cells in your blood that are outside of the standard range can indicate an immune system defect.