👉 The Hit-Fluid model is a conceptual framework used to understand and categorize the immune system's response to pathogens. It distinguishes between "hit" and "fluid" phases based on the speed and nature of the immune response. The "hit" phase involves a rapid, localized response where specific immune cells, such as T cells and B cells, quickly recognize and attack the invading pathogen, leading to immediate but often temporary protection. In contrast, the "fluid" phase is a broader, more generalized immune response that occurs after the initial hit, involving systemic inflammation and the activation of various immune cells to combat the infection more broadly. This model helps explain how the immune system balances immediate defense with long-term protection, adapting its response based on the threat's characteristics and the host's immune status.
