The difference between infection and inflammation?

Inflammation: The defensive response of living tissues with vascular system to injury factors is inflammation. Vascular reaction is the central node of inflammatory process.

Inflammation, also known as "inflammation", is a defensive response of the body to stimulation, which is characterized by redness, swelling, heat and pain. Inflammation can be infectious inflammation caused by infection or non-infectious inflammation caused by infection. Usually, inflammation is beneficial and an automatic defense response of human body, but sometimes, inflammation is also harmful, such as attacks on human body's own tissues, inflammation in transparent tissues and so on.

Inflammatory infection

The reaction to damaged local tissues of the body is called inflammation. It is divided into acute and chronic according to the duration. Acute inflammation is characterized by redness, swelling and pain. That is, inflammation is mainly composed of the response of the vascular system. Local blood vessels dilate, blood is slow, blood components such as plasma and neutrophils infiltrate into tissues, and the exudation is mainly centered on veins. The exudation of high molecular substances such as protein can't be explained only by the pressure difference inside and outside blood vessels and the pressure difference in colloid osmotic pressure. What is concerned here is the role of various substances that can enhance vascular permeability. These substances mainly include: (1) histamine, serotonin and other amine substances can cause immediate reaction after inflammatory stimulation. (2) Polypeptides represented by bradykinin, pancreatic kinin and methoxy -NYL- lysyl-bradykinin. Its * * * feature is that it can increase blood vessel permeability, smooth muscle contract and blood vessel expand, and promote leukocyte migration. The structures of bradykinin and lysyl bradykinin have been determined. (3) Proteases such as plasmin, kallikrein and globulin -PF permeability factor (PF) cannot be used as vascular permeability agents. But it can turn kinin into kinin and play a role. However, the location and mechanism of these substances acting on blood vessels are mostly unknown. Histologically, we can see the mixed reaction of vascular exudation and repair process when acute inflammation occurs. Macrophages, lymphocytes and plasma cells infiltrated and fibroblasts proliferated. The main tissue changes of inflammation can be divided into: (1) degenerative inflammation. (2) Exudative inflammation (serositis, cellulitis, suppurative inflammation, hemorrhagic inflammation, necrotizing inflammation, catarrhal inflammation). (3) Proliferative inflammation. (4) Specific inflammation (tuberculosis, syphilis, leprosy, lymphogranuloma, etc. ).