In this article we will discuss about the resistance of human body against foreign agents. While the innate non-specific defense mechanisms are present in the body since birth, the acquired resistance develops in the body only in response to a foreign agent. Such resistance is effective only against the agent which evokes the response and not to other agents. Thus, [...]
The following points highlight the three main types of serological reactions that occur in human body. The types are: 1. Neutralization 2. Precipitation 3. Agglutination. Serological Reaction: Type # 1. Neutralization: Neutralization is a type of serological reaction which occurs between a toxin and its antibody (antitoxin) or between a virus and its antiserum. The reaction is so named, because [...]
In this article we will discuss about cell-mediated immunity. While humoral immunity protects the body from extracellular pathogenic agents and soluble antigens like toxins, cell-mediated immunity is directed against intracellular pathogens. The infected body cells are recognized by the immune cells and are destroyed. Also, abnormal body cells, like cancer cells, are recognized as non-self due to the presence of [...]