Immune response: memory T cells are formed earlier than previously thought
For a person to acquire immunity to a disease, T cells must develop into memory cells after contact with the pathogen. Until now, the number of cells that do this was believed to depend above all on the magnitude of the initial immune response. A team of researchers at the Technical University of Munich (TUM) has now called this into question.
When a virus enters the body, it is picked up by certain cells of the immune system. They transport the virus to the lymph nodes where they present its fragments, known as antigens, to CD8+ T cells responsible control of viral infections. Each of these cells carries a unique T cell receptor on the surface that can recognize certain antigens. However, only very few T cell receptors match a given viral the antigen.
To bring the infection under control and maximize the defenses against the virus, these few antigen-specific T cells start dividing rapidly and develop into effector T cells. These kill virus-infected host cells and then die off themselves once the infection is cleared. Some of these short-lived effector cells - according to the generally accepted theory - turn into memory T cells, which persist in the organism long term. In case the same pathogen enters the body again, memory T cells are already present and ready to fight the invader more swiftly and effectively than during the first encounter.
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What little ditties/silly songs do you REMEMBER from your younger days?
learning how to drive 
How Stan rolls on a Sunday 
How I Cope With Stress
