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Concept
Eradication of infectious diseases
Summary
The eradication of infectious diseases is the reduction of an infectious disease's prevalence in the global host population to zero.
Two infectious diseases have successfully been eradicated: smallpox in humans, and rinderpest in ruminants. There are four ongoing programs, targeting the human diseases poliomyelitis (polio), yaws, dracunculiasis (Guinea worm), and malaria. Five more infectious diseases have been identified as potentially eradicable with current technology by the Carter Center International Task Force for Disease Eradication—measles, mumps, rubella, lymphatic filariasis (elephantiasis) and cysticercosis (pork tapeworm).
The concept of disease eradication is sometimes confused with disease elimination, which is the reduction of an infectious disease's prevalence in a regional population to zero, or the reduction of the global prevalence to a negligible amount. Further confusion arises from the use of the term 'eradication' to refer to the total removal of a given pathogen from an individual (also known as clearance of an infection), particularly in the context of HIV and certain other viruses where such cures are sought.
The targeting of infectious diseases for eradication is based on narrow criteria, as both biological and technical features determine whether a pathogenic organism is (at least potentially) eradicable. The targeted pathogen must not have a significant non-human (or non-human-dependent) reservoir (or, in the case of animal diseases, the infection reservoir must be an easily identifiable species, as in the case of rinderpest). This requires sufficient understanding of the life cycle and transmission of the pathogen. An efficient and practical intervention (such as a vaccine or antibiotic) must be available to interrupt transmission. Studies of measles in the pre-vaccination era led to the concept of the critical community size, the minimal size of the population below which a pathogen ceases to circulate. The use of vaccination programs before the introduction of an eradication campaign can reduce the susceptible population.
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Pan American Health Organization
The Pan American Health Organization (PAHO) is a specialized agency of the United Nations (UN) in charge of international health cooperation in the Americas. It fosters technical cooperation among member countries to fight communicable and noncommunicable diseases, strengthen health systems, and respond to emergencies and disasters. It has 35 Member States and four Associate Members in the region. Headquartered in Washington, D.C., PAHO is the regional office for the World Health Organization in the Americas, and the health organization of the Inter-American System.
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Smallpox was an infectious disease caused by variola virus (often called smallpox virus) which belongs to the genus Orthopoxvirus. The last naturally occurring case was diagnosed in October 1977, and the World Health Organization (WHO) certified the global eradication of the disease in 1980, making smallpox the only human disease to be eradicated. The initial symptoms of the disease included fever and vomiting. This was followed by formation of ulcers in the mouth and a skin rash.
Dracunculus medinensis
Dracunculus medinensis (Guinea worm, dragon worm, fiery serpent) is a nematode that causes dracunculiasis, also known as guinea worm disease. The disease is caused by the female which, at around in length, is among the longest nematodes infecting humans. In contrast, the longest recorded male Guinea worm is only . Guinea worm is on target to be the second infectious disease of humans to be eradicated, after smallpox.
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