Answer:
A pandemia, is a very serious public health issue that is defined as the uncontrolled spread of a pathogen through a very extensive portion of the population, across a country, a region, and even the world. One such pandemic is the influenza pandemic.
In order to be able to prevent such a disease from further spreading, and causing casualties, the placing of systems, a system of response, a system of prevention, precaution, and even intervention, is really important, and vital, to ensure first, the prevention of new cases, second, the treatment of those that are already suffering from the disease, and third, to contain the spreading from further reaching out. The players in these systems are first, and foremost, the national governments, and all such authority entities, in a country, and around the world. They are the ones who establish the policies, protocols and take the necessary actions to stop a pandemic from either happening, or from getting worse, if it has already struck. Second to the government, are the healthcare entities and organizations, which are the ones with the necessary knowledge and capabilities to bring about the execution of the necessary measures to respond to a pandemic.
After these, lay the public at large, all players in a system that will form a sort of chain to stop pandemics from causing further damage.
One way of preventing an outbreak, like that of the influenza, comes with campaign systems, in which the public, and healthcare professionals, are educated on how to prevent a disease, how to manage it if it already has appeared, and how to stop its spreading to other members of the community.
With access to the necessary funding, and especially to resources, public health leaders may ensure that the necessary measures are being taken so that pandemics may not arise, or if they do, they are short-lived and do not cause so many casualties.