$T$-cells are lymphocytes which produce the cellular immunity. These are developed from
Thymus
Liver
Spleen
Endothelium of blood vessels
The immunity obtained after the body has recovered from a disease is
A malfunction of the lymph nodes would most likely interfere with the
What are pathogens ?
After vaccination the body builds up
Lacking of $B$-cells and $T$-cells is known as