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When you are in really dirty, germy, unclean places. Also, when you are sick, your immune system might be lowered, so you would be more susceptible to germs in that instance also.
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To avoid contamination. The immune system is surpressed making the patient susceptible to any disease it might encounter, even when a healthy body would be able to fight it off.
AIDS is an autoimmune disease; it destroys the immune system. So, yes, it affects the immune system.
Cystic fibrosis affects primarily lungs and pancreas, not immune system. But a patient affected is debilitated and it would decrease the fuction of various systems, like the immune A CF patient that has had a lung transplant would have an impaired immune system because of the medication given for rejection. The medication would suppress the immune system so that the patients' body would be more likely to accept the new organ(s), but also making the patient more susceptible to other illnesses.
Cancer cells consume lot of nutrients out of the body of the patient. The patient becomes debilitated due to cancer. His immune system is adversely affected very much. So they become susceptible to various infections and other diseases.
Epilepsy is not an infection or a virus or anything like that, so the immune system is not relevant to it. You cannot "catch" epilepsy from someone. So the immune system does not respond to epilepsy. There is nothing that it can do.
Immunosuppressants are drugs that suppress that suppress/restrain your immune system so it is considerably weaker when on those meds. These medications are used after people have transplant surgery to prevent the body rejecting the transplanted organ. As well, predisone given for lung conditions suppresses the immune system temporarily. With a suppressed immune system, the person is susceptible to acquire other infections, such as even the common cold. Except, with a suppressed immune system, even a common cold virus can turn deadly because the person's suppressed immune system won't fight the illness as vigorously as normal.
After being sick for so long, he had a weakened immune system.
It does the work for the immune system, so in turn the immune system gets lazy
Your immune system is low.
The immune system keeps deadly bacteria out of it so that it can survive and reproduce. Without the immune system, the body wouldn't be able to live for more than an hour (literally.).