According to the World Health Orgnization, an
emerging
infectious disease (EID) is an infectious disease that has appeared in a population for the first time, or that may have existed previously but is rapidly increasing in incidence or geographic range (
WHO
). Outbreaks are the occurrence of disease cases in excess of what would normally be expected for a community, geographical area or season (WHO). Examples of recent outbreaks affecting public health in United States include
Group A Streptococcus
,
Pertussis
,
Zika,
Mumps
, and
Measles
.