1. Avian Influenza: A New Pandemic Threat?
Andrej Trampuz, MD, Rajesh M. Prabhu, MD, Thomas F. Smith, PhD, Larry M. Baddour, MD 
Mayo Clinic Proceedings 
Volume 79, Issue 4, Pages (April 2004)
DOI: /
Copyright © 2004 Mayo Foundation for Medical Education and Research Terms and Conditions

2. Figure 1
Wild aquatic birds are the main reservoir for influenza A viruses, from which viruses can be transmitted to other hosts such as horses, pigs, poultry, whales, seals, and humans. As indicated by arrows, humans can also be infected by pigs and poultry.
Mayo Clinic Proceedings  , DOI: ( / )
Copyright © 2004 Mayo Foundation for Medical Education and Research Terms and Conditions