A striped racer, also known as the California whipsnake, is a species of non-venomous snake native to the coast and foothills of California. It is a long, slender, and fast-moving snake, identified by its distinctive stripes running down the length of its body. They primarily feed on lizards and small rodents. The scientific name for this species is Masticophis lateralis.
Hymenolepis nana (dwarf tapeworm) infection
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Hymenolepis nana, a tiny intestinal tapeworm, is one of the most common human cestodes; infection is treated with praziquantel .
H. nana is only 15 to 40 mm long. It requires only one host but can also cycle through two. Its larvae migrate only within the gut wall, and its life span is relatively short (4 to 6 weeks).
H. nana is more frequent in populations, particularly children, living in conditions of poverty and poor hygiene, particularly when fleas are present.
H. nana has 3 modes of infection:Indirect 2-host cycle: Rodents are the primary definitive hosts, and grain beetles, fleas, or other insects feed on contaminated rodent droppings as intermediate hosts; humans can become infected by ingesting parasitized insects.
Human-to-human oral-anal cycle: Eggs are passed from one human to another or recycle externally in a single host.
Internal autoinfection: Eggs hatch within the gut and initiate a 2nd generation without ever exiting the host. Autoinfection can result in large numbers of worms and symptoms.Infections are often asymptomatic, but heavy infections may cause crampy abdominal pain, diarrhea, anorexia, pruritis ani, and nonspecific systemic symptoms. On occasion H. nana is misdiagnosed as pinworm infection.
Diagnosis is made by finding eggs in stool samples.
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