Jun 202017

via Centers for Disease Control and Prevention

Scientists at the University of Notre Dame have found that exposure to just 10 minutes of light at night suppresses biting and manipulates flight behavior in the Anopheles gambiae mosquito, the major vector for transmission of malaria in Africa, according to new research published in the journal Parasites and Vectors.

Critical behaviors exhibited by the species, such as feeding, egg laying and flying, are time-of-day specific, including a greater propensity for nighttime biting. A recent report from the World Health Organization stated an estimated 212 million people worldwide are infected with the disease, resulting in 429,000 deaths – mostly children.

Insecticide-treated bed nets and walls have helped prevent bites and reduce malaria, but researchers say mosquitoes are adapting to preventive conditions, leaving adults and children vulnerable in the early evening and early morning hours – when they are not under the nets or in the house.

“Anopheline mosquitoes are adapting to these current methods by developing resistance to insecticides and by shifting feeding to earlier in the evening or later into the early morning, times of the day when people are not in bed and therefore not protected by a net. So what used to be an efficient method is becoming less effective,” said Giles Duffield, associate professor of biology in the Department of Biological Sciences at the University of Notre Dame and the Eck Institute for Global Health, who specializes in the molecular biology of circadian rhythms and photobiology in mammals and mosquitoes. “We need to discover new methods to address mosquito control and prevention. The systems and tools we currently have including global distribution and usage of insecticide-treated bed nets and spraying are not enough.”

For the study, Duffield and his team tested the mosquitoes’ preference to bite during their active host-seeking period by separating them into multiple control and test batches. Control mosquitoes were kept in the dark, while test batches were exposed to a pulse of white light for 10 minutes. Researchers then tested the propensity of the mosquitoes to bite immediately after the pulse and every two hours throughout the night, holding their arms to a mesh lining that allowed uninfected mosquitoes to feed while remaining contained. Results indicated a significant suppression. In another experiment, mosquitoes were pulsed with light every two hours, and using this multiple pulse approach the team found that biting could be suppressed during a large portion of the 12-hour night.

“Most remarkable is the prolonged effect a short light treatment has on their preference to bite, with suppression lasting as long as four hours after the pulse,” Duffield said. “This may prove to be an effective tool that complements established control methods used to reduce disease transmission.”

Pulses of light would probably be more effective than constant exposure, Duffield said, as the mosquitoes would be less likely to adapt to light presented in periodic doses. The research team is testing the effectiveness of different wavelengths of light, such as red light, that would be less disturbing to adults and children while they sleep, with an aim toward developing field-applicable solutions.

Learn more: Researchers use light to manipulate mosquitoes


The Latest on: Mosquito control
  • Mosquito Nets Widely Used for Fishing, Study Finds
    on February 20, 2018 at 2:18 pm

    Fishing with mosquito nets is illegal in many places to keep the fish population safe. But Short is not sure that is the best way to control the method. "There's huge issues with enforcement," she says. "Do you put a mother who's trying to feed her kids in ... […]

  • IAEA Chief Highlights Sterile Mosquito Program
    on February 20, 2018 at 12:30 am

    He spoke at the first coordination and consultative meeting for a new four-year project on using the technique to control the mosquito population, "Managing and Controlling Aedes Vector Populations Using the Sterile Insect Technique," with Amano saying the ... […]

  • Livingston Parish Council on 'fact-finding mission' for effective mosquito abatement
    on February 19, 2018 at 12:10 pm

    Proponents Keen and Garry "Frog" Talbert said they heard some constituents were saying the mosquitoes were getting out of control. Follow Caroline Grueskin on Twitter, @cgrueskin. […]

  • New report: Mosquito control service market forecast 2018-2025
    on February 14, 2018 at 12:38 am

    The Global Mosquito Control Service Industry Research Report includes companies engaged in manufacturing, capacity, production, price, cost, revenue and contact information. - Agency -. This report studies the Mosquito Control Service market status and ... […]

  • Local Briefs 2/14: Mosquito Control to present info, community yard sale, and more
    on February 13, 2018 at 4:46 pm

    The Citrus County Mosquito Control District will be giving a presentation explaining the operations and services provided by the district at Lakes Region Library, 1511 Druid Road, Inverness, at 10:30 a.m. Friday, Feb. 16. All interested in learning about ... […]

  • Bacteria-infected mosquitoes might be good thing for Miami
    on February 13, 2018 at 3:18 pm

    Miami-Dade County Mosquito Control and Habitat Management Division is releasing non-biting male mosquitoes infected with naturally occurring Wolbachia bacteria to mate with wild female mosquitoes. The bacteria are not harmful to humans, but will prevent ... […]

  • Millions of Mosquitoes to Be Released in Florida for Good Cause
    on February 11, 2018 at 8:48 am

    The Miami-Dade County Mosquito Control and Habitat Management Division is releasing millions of mosquitoes infected with a bacteria that will curb the insect’s population. The lab-bred males are infected with Wolbachia, bacteria officials said is not ... […]

  • Newsmaker: Local mosquito control company buys Texas company
    on February 9, 2018 at 2:38 pm

    Kris Stone and Stephen Lindberg, owners of Tulsa Mosquito Control, announced they have bought Texas-based Mosquito Defense Systems. Stone and Lindberg did part-time work with the Texas company in 2006 but left in 2011 to pursue other opportunities ... […]

  • Miami releases millions of modified mosquitoes to stop Zika outbreak
    on February 8, 2018 at 5:17 pm

    Miami-Dade County Mosquito Control and Habitat Management Division is releasing non-biting male mosquitoes infected with naturally occurring Wolbachia bacteria to mate with wild female mosquitoes. The bacteria are not harmful to humans, but will prevent ... […]

via Google News and Bing News

Other Interesting Posts

Leave a Reply

%d bloggers like this: