A notifiable disease is any disease that is required by law to be reported to government authorities. The collation of information allows the authorities to monitor the disease, and provides early warning of possible outbreaks. In the case of livestock diseases, there may also be the legal requirement to destroy the infected livestock upon notification. Many governments have enacted regulations for reporting of both human and animal (generally livestock) diseases. This usually happens during pandemics.
The World Health Organization's International Health Regulations 1969 require disease reporting to the organization in order to help with its global surveillance and advisory role. The current (1969) regulations are rather limited with a focus on reporting of three main diseases: cholera, yellow fever and plague.
The revised International Health Regulations 2005 broadens this scope and is no longer limited to the notification of specific diseases. Whilst it does identify a number of specific diseases, it also defines a limited set of criteria to assist in deciding whether an event is notifiable to WHO.
The OIE (World Organisation for Animal Health) monitors specific animal diseases on a global scale.
The National Notifiable Diseases Surveillance System (NNDSS) was established in 1990. Notifications are made to the States or Territory health authority and computerised, de-identified records are then supplied to the Department of Health and Ageing for collation, analysis and publication. The Australian national notifiable diseases list and case definitions are available online.
Within Australia the Department of Agriculture, Fisheries and Forestry regulates the notification of infectious animal diseases.
Notification is regulated under Brazilian Ministry of Health Ordinance number 1.271 of June 6, 2014.