i don't know may be because they are hard i can't answer this question
People tend to feel ill/sick when they have an infectious disease because their body is fighting off that infectious disease. since the body if fighting of that disease it can have a toll on that individuals physical health making them tired.
AIDS is caused by the HIV virus, which attacks disease-fighting cells.
HIV infection or AIDS is the disease, which you have infection by HIV virus, that attacks disease fighting cells in the blood.
Huntington's disease is a genetic disease (not carried by an infectious vector) and so, it is not infectious.
A good immune system is the best help in fighting off infectious diseases. If the system is suppressed, the disease has a better chance of getting a foothold.
non infectious
a doctor who helps people with infectious diseases.(see infectious disease)
Pellagra is not an infectious disease. Pellagra is a nutritional deficiency disease.
an infectious disease is a disease caused by bacterial, viral, fungal, or protozoan infection.
Piles (A Swollen Hemorrhoid) is not a infectious disease.
infectious disease
Chemical spills are not an infectious disease.