History for mRNA vaccines
BioNTech/Pfizer's mRNA covid vaccine made a history being the first mRNA vaccine to be approved for human use. This newest technology in vaccine was introduced by joint research at Salk institute and biotech company Vical Incorporated in 1989. mRNA vaccines have many upper hands to the traditional vaccines but also comes with its drawbacks which will be discussed further down below.
Human immune system
Human immune system consists of different mechanisms to fight off the foreign invaders inside our body. White blood cells are the armies of our body that protect against any invaders of virus and bacteria. But these armies are also differentiated according to their purposes, they are of following types:
📍T-cells: These type of white blood cells can be further divided into helper,killer, regulator and memory T-cell.
🔸Killer T-cell is the only cell which have weapons to destroy the invaders.
🔸Helper T-cell signals the attack and help killer to locate the invaders.
