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Related Concept Videos

Malaria01:29

Malaria

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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Symbiosis

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...
Yellow Fever01:18

Yellow Fever

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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Transmission of Pathogens

Pathogens spread from their reservoirs to susceptible hosts through three main routes: contact transmission, vehicle transmission, and vector transmission. Each route involves distinct mechanisms of transfer.Contact TransmissionThis category includes direct contact, indirect contact, and droplet transmission:Direct contact involves immediate physical interaction between individuals—such as a handshake—which can spread pathogens like Streptococcus pyogenes, the bacterium responsible for...
American Trypanosomiasis01:22

American Trypanosomiasis

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Related Experiment Video

Updated: May 31, 2026

Standard Membrane Feeding Assay for the Detection of Plasmodium falciparum Infection in Anopheles Mosquito Vectors
05:28

Standard Membrane Feeding Assay for the Detection of Plasmodium falciparum Infection in Anopheles Mosquito Vectors

Published on: May 12, 2022

Is the current decline in malaria burden in sub-Saharan Africa due to a decrease in vector population?

Dan W Meyrowitsch1, Erling M Pedersen, Michael Alifrangis

  • 1Section of Health Services Research, Department of Public Health, University of Copenhagen, Øster Farimagsgade 5B, DK-1014, Copenhagen K, Denmark. d.meyrowitsch@sund.ku.dk

Malaria Journal
|July 15, 2011
PubMed
Summary
This summary is machine-generated.

Malaria vector populations significantly declined in Tanzania between 1998-2009, even without interventions. This decrease in Anopheles mosquitoes, potentially linked to rainfall changes, may explain reduced malaria rates across sub-Saharan Africa.

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Building a Better Mosquito: Identifying the Genes Enabling Malaria and Dengue Fever Resistance in A. gambiae and A. aegypti Mosquitoes
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A Blood-Free Diet to Rear Anopheline Mosquitoes

Published on: January 31, 2020

Area of Science:

  • Medical Entomology
  • Tropical Public Health
  • Epidemiology

Background:

  • Malaria remains a significant health burden in sub-Saharan Africa, primarily caused by Plasmodium falciparum.
  • Reported declines in malaria are often attributed to interventions like bed nets and improved case management.
  • However, malaria vector declines have also been observed in areas lacking such interventions.

Purpose of the Study:

  • To assess temporal changes in Anopheline mosquito populations in two highly malaria-endemic communities in Northeast Tanzania.
  • To investigate the association between rainfall patterns and malaria vector population dynamics over an 11-year period (1998-2009).

Main Methods:

  • Weekly mosquito collections were conducted in 50 households using CDC light traps across two distinct periods: 1998-2001 and 2003-2009.
  • Monthly rainfall data were obtained from a local climate station.
  • Statistical analyses explored the relationship between rainfall trends and Anopheline population changes.

Main Results:

  • Significant declines in Anopheles gambiae (76.8% and 99.7%) and Anopheles funestus (55.3% and 99.8%) were observed during the first and second study periods, respectively.
  • By 2009, only 14 Anopheline mosquitoes were collected from 2368 traps.
  • No consistent statistical association was found between monthly rainfall trends and the decline in malaria vector populations, except for An. gambiae during the first period.

Conclusions:

  • A sustained longitudinal decrease in malaria vector density occurred over both study periods, independent of organized vector control measures.
  • While rainfall pattern changes may contribute, other unidentified factors likely drive the observed dramatic decline in vector populations.
  • This decline in malaria vector density could be a contributing factor to the reported decreases in malaria infection rates across sub-Saharan Africa.