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.
To produce an immune response, live attenuated vaccines. must replicate (grow) in the vaccinated person. A relatively. small dose of virus or bacteria is administered, which. replicates in the body and creates enough of the organism. to stimulate an immune response.lassification of Vaccines There are two basic types of vaccines: live attenuated and inactivated. The characteristics of live and inactivated vaccines are different, and these characteristics determine how the vaccine is used.