People who may carry disease may be put into 'isolation'.
grave disease
No. They are microorganisms that cause disease.
It may cause disease
heart disease
Those factors are known as risk factors for the disease. Risk factors are characteristics or behaviors that are associated with an increased likelihood of developing a particular disease but may not necessarily cause the disease on their own.
Inflammatory bowel disease may cause growth of polyps and pseudo-polyps
Yes, if not treated, Wilson disease may cause death.
pathogen
yes
Some people with Canavan disease may eventually become blind
Infectious disease may be referred to as extrinsic because the root cause came from outside of the patient's body. In contrast, a genetic condition may be considered intrinsic, because the cause is within the patient.
The main disease that lack of carrots can cause is blindness.