Communicable Diseases More Condition_symptoms How Are Disease Vectors For Non-lethal Communicable Diseases Found?

How are disease vectors for non-lethal communicable diseases found? - communicable diseases more condition_symptoms

There are many popular literature / fact / movies that deal with the communication of deadly diseases like Ebola epidemic. But try as health officials to plot vectors of epidemics due to lack of mortal? For example, States experienced its worst outbreak of mumps since the beginning of routine vaccination. Then health authorities after the collapse of a patient zero? How to determine when and where (and in some cases, as it spread) disease? Or, if it is not a significant threat of loss of life is a concern, do not bother? Is it more or less difficult than against the deadly disease? Are there other reasons? (I believe the transfer would probably be faster and / or more widespread than the regular winter flu ...)