Anyone who may be infected would be on quarantine to prevent anyone from catching that disease. Anyone who was in contact of a sick person will be on isolation, even if he/she hasn't caught the disease in case she/he maybe carrying the disease. Try to stay away from sick people and stay away from people who was in contact with that person.
rapidly
Scientific knowledge about a disease can include information about how the disease is spread (ie. fleas, rats, by contact), statistics of areas where it might increase, and treatment options. Soft sciences that include psychology might help in getting people vaccinated or convincing them to stay home in quarantine to prevent the spread of disease. The recent Ebola outbreak is a good resource for seeing how the UN and local communities handled the large areas that were involved.
we can prevent this with keeping our body healthy.
To better understand how and why a disease spread, and how to prevent further spread of the disease or diseases like it.
Malaria is spread by Mosquitos & Sickle cell is an inherited disease so it would be easier to have an outbreak Malaria.
Washing your hands.
Epidemic. If it is world-wide, then it is called a pandemic.
Kill anything that could be host to the disease. Without hosts, the disease will not spread.
prevent the spread of disease or illness
Handwashing
To prevent the spread of disease or conditions such as verrucas (herpes virus).
In fact it was the Prophet Muhammad who said that : if you are travelling and you hear of an outbreak of disease, stay away. And if you are in a location where an outbreak of disease occurs, do not leave. That is the guidance of God - revealed to Muhammad over one thousand years ago.