Human Medicine
International - WHO :
www.who.int/ihr/en/
Australia :
www.health.gov.au/casedefinitions
Ireland :
www.hpsc.ie/NotifiableDiseases/ListofNotifiableDiseases/
USA :
http://wwwn.cdc.gov/nndss/
Germany :
https://www.gbe-bund.de/
UK :
www.gov.uk/notifiable-diseases-and-causative-organisms-how-to-report
Veterinary medicine
International - OIE :
http://www.oie.int/animal-health-in-the-world/oie-listed-diseases-2014/