Mosquitoes sense infrared from body heat to help track humans down

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#Mosquitoes #Infrared #BodyHeat #HumanTracking #NatureFacts

🦟 Mosquitoes are showing a heightened preference for human blood as biodiversity loss in the Brazilian Atlantic Forest intensifies. A study found that in areas with reduced wildlife, mosquitoes are increasingly feeding on humans, raising concerns about greater transmission of viral diseases.

🔬 Researchers analyzed the blood meals of 145 engorged mosquitoes in Rio de Janeiro, identifying that 18 of these meals were from humans, alongside one amphibian, six birds, one canid, and one mouse. This indicates a significant shift in feeding habits due to habitat changes.

🌳 The Atlantic Forest, once rich in species, has seen its area reduced by human expansion, pushing mosquitoes to seek readily available hosts like humans for sustenance. This shift increases the risk of diseases such as Yellow Fever, dengue, Zika, and Chikungunya spreading to human populations.

#Mosquitoes #Biodiversity #PublicHealth

🦟 Mosquito DNA analysis reveals human biting began 2.9 to 1.6 million years ago.

🌍 This adaptation likely occurred on Sundaland (modern Malay Peninsula, Borneo, Sumatra, Java) as early humans, possibly Homo erectus, migrated into Asia around 1.8 million years ago.

🐒 The Anopheles leucosphyrus group was the first to develop a preference for human blood, having previously fed on nonhuman primates.

#Mosquitoes #Evolution #AncientHistory

🧠 Researchers discovered that yellow fever mosquitoes exposed to DEET insect repellent can actually learn to associate the chemical's smell with a blood meal, turning a potentially negative experience into a positive one.

🔬 In experiments conducted by Virginia Tech, mosquitoes were trained to link the scent of DEET with food. Later, these trained mosquitoes were attracted to a hand treated with DEET, while untrained mosquitoes avoided it.

🤔 This suggests that DEET doesn't mask human scent, but rather mosquitoes can be trained to be attracted to it when paired with a reward, especially as the repellent's effectiveness wears off.

⚠️ The findings do not advise against using DEET, which remains the "gold standard" for protection, but emphasize the importance of reading product labels for varying concentrations and instructions.

#Mosquitoes #DEET #InsectRepellent

🦟 New research suggests DEET, a common mosquito repellent, could become attractive to insects if they associate it with feeding.

🦟 A study found that mosquitoes which fed on blood while exposed to DEET were significantly more likely (60%) to later attempt biting when exposed to DEET alone, compared to untrained mosquitoes (17%).

🦟 Experts emphasize that DEET remains effective for travelers. The learning effect observed occurs under specific lab conditions and is less likely in real-world scenarios. Reapplying repellent as instructed is key.

#DEET #Mosquitoes #PublicHealth