Over the past 20 yr we have witnessed epizootics and epidemics involving several pathogenic diseases representing global threats to animal and human health. In the past 5 yr alone epidemiologists and public health workers have been alerted on the ProMed computer site (http://www.promedmail.org) to many human and animal diseases that were transported from one country to another. These included African trypanosomiasis, bovine spongiform encephalopathy (BSE), bovine tuberculosis, brucellosis, campylobacteriosis, cholera, Crimea–Congo hemorrhagic fever, cyclosporiasis, dengue, diphtheria, dracunculus, heartwater, human immunodeficiency virus (HIV) infections, hepatitis types A, B, and E, infectious bovine rhinotracheitis (IBR), influenza A, Japanese encephalitis, Lassa fever, legionellosis, malaria, Newcastle disease, paratyphoid, plague, rabies, Ross River virus infection, shigellosis, trichinellosis, tularemia, typhoid, West Nile fever virus, yellow fever, and yersiniosis. Primarily parasitic diseases, but also a few major diseases caused by other infectious agents, are presented as examples of emerging diseases...

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