Even when the in itial infectious or mole cular cau se is known, it is many st eps re moved ex pression of the disease.

• 对疾病缺乏完整认识无疑引起了疾病在人类中的持续存在，比如动脉硬化症与癌症，人类无视疾病存在的消极态度也会影响疾病自身的发展。