Answer:
The public health officials are growing more concerned about zoonotic diseases because the global outbreak of a disease is less predictable.
Step-by-step explanation:
Zoonotic diseases are those diseases which are carried by animals and transmitted to other animals and human. Animals carrying zoonotic disease can also carry a newly emerged pathogen for which vaccines might not be available which is the main reason of public health concern.
The study of epidemiology helps in preventing outbreaks by making strategies to provide appropriate medicine for a particular outbreak and controlling the cause of the outbreak by creating awareness if the vaccine is not available. For example, in the case of malaria.