Linked from
The 19 pages that link to Emerging infectious disease, each with the reason it gives.
ZoonosisNarrower topic: Many newly recognized human infections originate in animal hosts.
VirusRelated: Changes in viruses and their hosts can produce newly spreading infections.
HostRelated: A shift to new host species can help an infection emerge.
Viral diseaseRelated: New or expanding viral diseases can challenge health systems and surveillance.