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Chagas disease is caused by infection with the protozoan parasite T. cruzi, which is typically introduced into humans through the bite of triatomine bugs, also called "kissing bugs". [4] When the insect defecates at the bite site, motile T. cruzi forms called trypomastigotes enter the bloodstream and invade various host cells. [ 5 ]
Pinworm life cycle. The cause of a pinworm infection is the worm Enterobius vermicularis. The entire lifecycle – from egg to adult – takes place in the human gastrointestinal tract of a single human host. [12] [17] This process is two to eight weeks. [18] [9]
The first appearance of eggs in stools is 60–70 days. In larval ascariasis, symptoms occur 4–16 days after infection. The final symptoms are gastrointestinal discomfort, colic and vomiting, fever, and observation of live worms in stools. Some patients may have pulmonary symptoms or neurological disorders during migration of the larvae.
Demodex folliculorum is a microscopic mite that can survive only on the skin of humans. [2] [3] Most people have D. folliculorum on their skin.Usually, the mites do not cause any harm, so are considered an example of commensalism rather than parasitism; [4] but they can cause disease, known as demodicosis.
Infectious bugs are getting stronger and more resistant to drugs. Because of that, a British government-commissioned review released Thursday says these "superbugs" could lead to more than 10 ...
While none of the main four species of malaria parasite that cause human infections are known to have animal reservoirs, [360] P. knowlesi is known to regularly infect both humans and non-human primates. [52] Other non-human primate malarias (particularly P. cynomolgi and P. simium) have also been found to have spilled over into humans. [361]
Understanding the symptoms of a brown recluse spider bite can be life-altering. "Some brown recluse spider bites can cause severe, local reactions with necrotic tissue," Dr. Giangreco says. These ...
A fungus ball in the lungs may cause no symptoms and may be discovered only with a chest X-ray, or it may cause repeated coughing up of blood, chest pain, and occasionally severe, even fatal, bleeding. [2] A rapidly invasive Aspergillus infection in the lungs often causes cough, fever, chest pain, and difficulty breathing. [citation needed]