If a plate with oceanic lithosphere meets another plate, the dense oceanic lithosphere dives beneath the other plate and sinks into the mantle: this process is called subduction. The sinking oceanic lithosphere drags the rest of the tectonic plate: this is the main cause of plate motion.
You may notice a decrease in symptoms during the build-up phase, but it may take as long as 12 months on the maintenance dose to notice an improvement. If allergy shots are successful, maintenance treatment is generally continued for three to five years.
Vaccinations and Eggs. Some shots contain egg and can cause an allergic reaction. For example, the MMR vaccine contains egg and is given around 12 to 15 months. Another shot that contains egg is the flu shot. So, again, be sure and watch for a reaction and talk to your doctor if you have a family history of allergies and are concerned about these shots.