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Dracunculus medinensis (Guinea worm, dragon worm, fiery serpent[1]) is a nematode that causes dracunculiasis, also known as guinea worm disease. [2] The disease is caused by the female [3] which, at around 80 centimetres (31 inches) in length, [4] is among the longest nematodes infecting humans. [5] The length of specimens exhibits extreme ...
Dracunculiasis, also called Guinea-worm disease, is a parasitic infection by the Guinea worm, Dracunculus medinensis. A person becomes infected by drinking water contaminated with Guinea-worm larvae that reside inside copepods (a type of small crustacean). Stomach acid digests the copepod and releases the Guinea worm, which penetrates the ...
Egg incubation. A female mallard duck incubates her eggs. Egg incubation is the process by which an egg, of oviparous (egg-laying) animals, develops an embryo within the egg, after the egg's formation and ovipositional release. Egg incubation is done under favorable environmental conditions, possibly by brooding and hatching the egg.
As of 2024, the WHO goal for eradication in humans and animals is the year 2030. Previously, 1991, 2009, 2015, and 2020 were set as target years, [ 7 ] but eradicating dracunculiasis has proven to be much harder than originally thought due to the discovery in the mid-2010s that the disease has non-human animal hosts.
The hens have a habit of hiding their nests, and sharing it with other hens until large numbers of eggs have accumulated. The incubation period is 26–28 days, and the chicks are called "keets". As keets, they are highly susceptible to dampness (they are indigenous to the more arid regions of Africa) and can die from following the mother ...
Between laying and hatching, some females continue to forage for food, while others dig burrows and rest there until hatching. [101] Ten days after it is laid, the egg hatches within the pouch. [27] [101] The embryo develops an egg tooth during incubation, which it uses to tear open the egg; the tooth disappears soon after hatching. [102]
Like other megapodes, Melanesian scrubfowl lay large eggs with a high yolk content (possibly as high as 65-69% of egg content compared to 15-40% in other birds). [16] [18] Melanesian scrubfowl eggs are adapted to surviving underground (e.g., thin egg shells improve gas exchange [3]) during their incubation which lasts between six and ten weeks ...
Coenurosis in humans. Coenurosis is a parasitic infection that results when humans ingest the eggs of dog tapeworm species Taenia multiceps, T. serialis, T. brauni, or T. glomerata. It is important to distinguish that there is a very significant difference between intestinal human tapeworm infection and human coenurosis.