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Chronic wasting disease (CWD), sometimes called zombie deer disease, is a transmissible spongiform encephalopathy (TSE) affecting deer.TSEs are a family of diseases thought to be caused by misfolded proteins called prions and include similar diseases such as BSE (mad cow disease) in cattle, Creutzfeldt–Jakob disease (CJD) in humans, and scrapie in sheep. [2]
A member of this family is called a deer or a cervid. They are widespread throughout North and South America, Europe, and Asia, and are found in a wide variety of biomes . Cervids range in size from the 60 cm (24 in) long and 32 cm (13 in) tall pudú to the 3.4 m (11.2 ft) long and 3.4 m (11.2 ft) tall moose .
Adults of P. tenuis can persist for many years in a single host, which allows for many first-stage larvae to be shed in feces. [1] [8] It is quite common in many populations of white-tailed deer, which have built up a strong resistance. [4] After gastropod ingestion, moose or other deer may be hosts of the second- and third-stage worms.
Nominator(s): Pres N 02:44, 21 March 2021 (UTC) [] Having finished my 10-list series of Carnivora (last one pending promotion), I decided to move on to this list of deer of the world, thinking that despite the 53-ish species in the family Cervidae that it was a pretty well-defined group and would be straightforward.
In some U.S. counties, over 80% of deer are infected. Experts worry that the progressive, fatal illness could spill-over to humans in a fashion similar to mad cow disease.
Thorold's deer (Cervus albirostris) [2] is a threatened species of deer found in the grassland, shrubland, and forest habitats, at high altitudes, of the eastern Tibetan Plateau, as well as some fragmented areas further north in central Western China. [3]
The sika deer (Cervus nippon), also known as the northern spotted deer or the Japanese deer, is a species of deer native to much of East Asia and introduced to other parts of the world. Previously found from northern Vietnam in the south to the Russian Far East in the north, [ 1 ] it was hunted to the brink of extinction in the 19th century.
Antlers are unique to cervids and found mostly on males: the only cervid females with antlers are caribou and reindeer, whose antlers are normally smaller than males'. Nevertheless, fertile does of other species of deer have the capacity to produce antlers on occasion, usually due to increased testosterone levels. [ 61 ]