The agent, host, and environment play key roles in the spread of infectious diseases. Infectious agents include Sex Temperature Viruses Nurses Third and fourth only Question 5 (1 point) Contingency planning is a very important process conducted by healthcare leaders and managers. An organization's contingency planning includes which of the following? Addressing current staffing Planning for a new service line Planning for uncertain or unexpected events, such as severe weather events Discussing routine hospital operations Both first and fourth.