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.
The process or procedure by which a person is intended to be made immune to certain types of infection by specific vaccination. Incubation Period. The anticipated time interval between exposure to an infectious agent and the appearance of the first sign or symptom of the disease.