Bid rent theory in the central business district (CBD) [edit]. Land users, whether they be retail, office, or residential, all compete for the most accessible land within the CBD. The amount they are willing to pay is called bid rent.
Recombinant or purified protein vaccines consist of protein antigens that have either been produced in a heterologous expression system (e.g., bacteria or yeast) or purified from large amounts of the pathogenic organism.
There are two types of vaccines, inactivated and live, and these present different indications after administration. Vaccinations are the act of administering the vaccine that produces immunity in the body against the organism. Immunization is the process by which one becomes protected from a disease. Vaccines cause immunization, and sometimes diseases can also trigger immunization after the individual recovers from the disease.