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Related Concept Videos

Malaria01:29

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Malaria pathogenesis in humans reflects a delicate interplay between parasite biology and host response. Clinical illness reflects a host’s immune response to the parasite’s asexual replication cycle, which is often asymptomatic in individuals with partial immunity. From the parasite's perspective, transmission between mosquito and human with minimal host pathology is evolutionarily advantageous. Among the six Plasmodium species infecting humans, P. falciparum and P. vivax dominate in global...
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Smallpox is a severe contagious disease caused by the Variola major virus, a double-stranded DNA member of the Poxviridae family.Variola major transmission occurs primarily via inhalation of virus-laden droplets or direct contact with infectious scabs. The incubation period averages approximately seven days, although it may range from 7 to 17 days depending on the inoculum and host factors.Clinically, the prodromal phase is marked by an abrupt onset of high fever, malaise, headache, and myalgia.
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Symbiotic relationships are long-term, close interactions between individuals of different species that affect the distribution and abundance of those species. When a relationship is beneficial to both species, this is called mutualism. When the relationship is beneficial to one species but neither beneficial nor harmful to the other species, this is called commensalism. When one organism is harmed to benefit another, the relationship is known as parasitism. These types of relationships often...
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Alveolates are a group of organisms recognized by the presence of alveoli, which are cytoplasmic sacs located beneath the cell membrane. While their function remains uncertain, alveoli may help regulate water balance by controlling how much water enters and leaves the cell. In dinoflagellates, these structures may serve as armor plates. There are three major types of alveolates: ciliates, which move using cilia; dinoflagellates, which use flagella for movement; and apicomplexans, which are...
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Toxoplasmosis, a zoonotic disease caused by the protozoan Toxoplasma gondii, poses significant public health challenges globally due to its high seroprevalence and varied clinical manifestations. As an obligate intracellular parasite, T. gondii can infect all warm-blooded vertebrates, but felids are its only definitive hosts, shedding unsporulated oocysts into the environment. Humans typically acquire the infection through ingestion of tissue cysts in undercooked meat or oocysts from...
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Yellow fever is a viral hemorrhagic disease caused by the yellow fever virus (YFV), a member of the Flaviviridae family. It is transmitted primarily by Aedes and Haemagogus mosquitoes in tropical and subtropical regions of Africa and South America. After transmission through a mosquito bite, the virus initially replicates in skin-resident immune cells such as dendritic cells and macrophages. These cells then migrate to the lymph nodes, where viral replication increases, eventually leading to...

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Phenotypic Analysis of Rodent Malaria Parasite Asexual and Sexual Blood Stages and Mosquito Stages
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Published on: May 30, 2019

Monkey malaria kills four humans.

Mary R Galinski1, John W Barnwell

  • 1Division of Infectious Diseases, Department of Medicine, School of Medicine, Emory Vaccine Center and Yerkes National Primate Research Center, Emory University, Atlanta, GA 30329, USA. mary.galinski@emory.edu

Trends in Parasitology
|April 7, 2009
PubMed
Summary
This summary is machine-generated.

Four deaths from Plasmodium knowlesi, a simian malaria, highlight the need for vigilance in Southeast Asia. Clinicians must reconsider malaria diagnoses, especially those mistaken for Plasmodium malariae.

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Building a Better Mosquito: Identifying the Genes Enabling Malaria and Dengue Fever Resistance in A. gambiae and A. aegypti Mosquitoes

Published on: July 4, 2007

Area of Science:

  • Tropical medicine
  • Parasitology
  • Public health

Background:

  • Plasmodium knowlesi is a simian malaria parasite.
  • Human infections with P. knowlesi are increasingly reported in Southeast Asia.
  • Misdiagnosis of P. knowlesi as less virulent human malaria species can have severe consequences.

Purpose of the Study:

  • To raise awareness about the increasing threat of Plasmodium knowlesi in humans.
  • To emphasize the need for re-evaluation of malaria diagnosis and treatment protocols.
  • To alert health facilities and clinicians in Southeast Asia to the potential severity of P. knowlesi infections.

Main Methods:

  • Case identification and analysis of human deaths attributed to P. knowlesi.
  • Review of clinical presentations and treatment outcomes.
  • Epidemiological surveillance in affected regions.

Main Results:

  • Four human deaths caused by Plasmodium knowlesi were identified in Malaysia.
  • These cases underscore the potential for severe disease and mortality from P. knowlesi.
  • There is a critical need to differentiate P. knowlesi from other Plasmodium species, particularly Plasmodium malariae.

Conclusions:

  • Plasmodium knowlesi poses a significant public health threat in Southeast Asia.
  • Clinical vigilance and accurate diagnostic approaches are crucial for managing P. knowlesi infections.
  • Healthcare providers must be prepared to diagnose and treat P. knowlesi, recognizing its potential for severe outcomes.