This image from 1968, depicted two public health workers, who while at the residence of an elderly couple, were in the process of discussing rodent control. One of the workers was jotting down notes on a paper affixed to a clipboard, while the second, a man at the doorway, was speaking with the husband in the background. In this case, they were specifically discussing the control of a neighborhood rat population. Rodenticidal grain baits, if registered by the EPA, can be used in some instances to provide longer-term rodent control. One new rodenticide, cholecalciferol (Vitamin D3, has been registered for use in New Mexico and holds great promise for the control of field rodents involved in plague epizootics. Different formulations are shown in PHIL 14333.