‘Loss of native wildlife drives mosquitoes to bite humans more’, Pg14

Key Highlights:

• A study in the Atlantic Forest along the Brazilian coast found that mosquitoes are increasingly feeding on human blood due to the loss of native wildlife and forests.
• The study surveyed an area home to 850 species of birds, 370 amphibians, 200 reptiles, 270 mammals, and 350 fish.
• Deforestation has reduced the forest to under a third of its original 1.3 million sq. km, leading mosquitoes to transmit deadly viruses and parasites to humans.
• The WHO estimates that India accounts for three-quarters of all malaria cases in South and South East Asia, with 95% of India's population living in malaria-endemic regions.

Detailed Insights:

• The research aimed to identify mosquito food sources in Brazil to understand ecological and epidemiological dynamics, crucial for assessing transmission risks.
• Researchers used light traps with CO2 to capture mosquitoes and analyzed their blood DNA, identifying blood meals from various species, including humans.
• Host availability and proximity significantly influence mosquito feeding preferences, even if some species have innate preferences.
• Loss of native vegetation and wildlife is linked to increased transmission of arboviruses, which are transmitted by arthropods like mosquitoes, ticks, and sandflies.
• Alterations in the natural habitats and life cycles of vectors affect their population density, further impacting disease transmission dynamics.
• The study emphasizes the importance of considering mosquito behavior and feeding preferences in vector control strategies to prevent pathogen transmission.

Key Concepts Involved:

• Arboviruses: Viruses transmitted to humans and other vertebrates by arthropods, such as mosquitoes and ticks.
• Vector Control: Methods used to limit or eradicate the vectors that transmit disease pathogens.
• Epidemiological Dynamics: The patterns, spread, and control of diseases within populations.