Answer :
Final answer:
An emerging pathogen is a disease that is new or increasing in prevalence, while a reemerging pathogen is a disease that was once controlled, but is increasing in frequency due to a change in conditions or the breakdown of prevention regimes.
Explanation:
An emerging pathogen is defined as one that has appeared in a population for the first time, or one that may have existed previously but is rapidly increasing in incidence or geographic range as monitored by organizations like the World Health Organization (WHO) and the CDC.
As for a reemerging pathogen, it is an infectious agent that was previously under control due to prevention or treatment strategies but is now resurfacing, possibly due to changing conditions or failure of previous prevention regimes.
Diseases such as drug-resistant forms of tuberculosis, bacterial pneumonia, and malaria are examples of reemerging diseases. The WHO has identified certain diseases like dengue fever, yellow fever, diphtheria, cholera, and bubonic plague whose worldwide reemergence should be monitored. These diseases were catastrophic in the past, devastating populations, and became dormant for a while, only to come back, sometimes even more virulent than before.
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