Technologies | Research | Outdoor Applications | Health + Environment | Publications | Aug 06, 2019

ALAN May Be Increasing West Nile Virus Spillover from Wild Birds

We're in the midst of summertime mosquito bite season and cities across the country are reporting a heightened number of West Nile Virus (WNV) cases. The house sparrow is one of the most common carriers of WNV in urban areas. Mosquitos feed off the infected birds and spread the virus to humans. New research finds house sparrows exposed to artificial light at night, such as what's used in parking lots, maintain higher burdens of WNV for longer than those who spend their nights in the dark.

The study published in Proceedings of the Royal Society B concludes infected house sparrows living in light polluted conditions remain infectious for two days longer than those who do not, enhancing their host competence, or propensity to generate infection in other hosts or vectors. In turn, mathematical models show this likely increases the potential for a WNV outbreak by about 41 percent.

Original Abstract of the Publication in the
Proceedings of the Royal Society B:

Among the many anthropogenic changes that impact humans and wildlife, one of the most pervasive but least understood is light pollution. Although detrimental physiological and behavioural effects resulting from exposure to light at night are widely appreciated, the impacts of light pollution on infectious disease risk have not been studied. Here, we demonstrate that artificial light at night (ALAN) extends the infectious-to-vector period of the house sparrow (Passer domesticus), an urban-dwelling avian reservoir host of West Nile virus (WNV). Sparrows exposed to ALAN maintained transmissible viral titres for 2 days longer than controls but did not experience greater WNV-induced mortality during this window. Transcriptionally, ALAN altered the expression of gene regulatory networks including key hubs (OASL, PLBD1 and TRAP1) and effector genes known to affect WNV dissemination (SOCS). Despite mounting anti-viral immune responses earlier, transcriptomic signatures indicated that ALAN-exposed individuals probably experienced pathogen-induced damage and immunopathology, potentially due to evasion of immune effectors. A simple mathematical modelling exercise indicated that ALAN-induced increases of host infectious-to-vector period could increase WNV outbreak potential by approximately 41%. ALAN probably affects other host and vector traits relevant to transmission, and additional research is needed to advise the management of zoonotic diseases in light-polluted areas.

"The findings may be the first indication that light pollution can affect the spread of zoonotic diseases," said lead author Meredith Kernbach, PhD student in the University of South Florida College of Public Health. "Many hosts and vectors use light cues to coordinate daily and seasonal rhythms, which is among the most reliable environmental cues, and disruption of these rhythms by light exposure at night could affect immune responses, generating the effects we see here."

Researchers studied 45 house sparrows, exposing half to artificial light at night. Following 7-25 days in captivity, the team exposed the birds to WNV and took blood samples 2, 4, 6, and 10 days post-exposure. Researchers found all birds were infected within 2-4 days, however after that, birds exposed to light at night maintained transmissible burdens of WNV.

Kernbach says they picked the little brown birds since they live in close proximity to humans in urban areas, play host to a number of parasites and diseases, and are frequent carriers of WNV. While birds exposed to light pollution remain infected for a longer period of time, this did not increase mortality rates.

These results follow a previous study led by the University of South Florida that found zebra finches that have the avian stress hormone corticosterone (CORT) are more susceptible to mosquito bites. Such stress is known to be caused by a number of factors such as road noise, pesticides and light pollution. Researchers suggest new lighting technologies be created that are detectable to humans, but not for wildlife.

References:

Meredith E. Kernbach et al, Light pollution increases West Nile virus competence of a ubiquitous passerine reservoir species, Proceedings of the Royal Society B: Biological Sciences (2019). Published: 24 July 2019. DOI: 10.1098/rspb.2019.1051

FEATURED

Precise Measurement of UV Light Sources for Disinfection

Precise Measurement of UV Light Sources for Disinfection UV radiation encompasses a very wide wavelength spectrum between 10 and 400 nm and is subdivided in ISO Standard 21348 into three ranges. The UVC range between 100 and 280nm is currently extremely relevant for air and water disinfection for combating COVID-19. Since the outbreak of the pandemic ... Read more »

EDITORIAL

Signify: New EU Ecodesign and Energy Labeling Regulations Are Met

Signify: New EU Ecodesign and Energy Labeling Regulations Are Met Signify (Euronext: LIGHT), confirms that its leading lighting portfolio will meet the new EU Ecodesign and Energy labeling regulations, which will affect all lighting products in the EU Member States from September 2021 onwards. The new regulations are representative of the enormous transition that ... Read more »

EDITORIAL

New DLC Report: Interoperability for Networked Lighting Controls

New DLC Report: Interoperability for Networked Lighting Controls Interoperability for Networked Lighting Controls explores the current interest in networked lighting controls (NLC) and the benefits various stakeholders can attain from championing interoperable systems. The report details three specific and actionable use cases and explains why interoperability ... Read more »

EDITORIAL

Measuring Uniformity of LED Luminaires in Seconds: MKS Announces Ophir® FluxGage™ 604 Measurement System

Measuring Uniformity of LED Luminaires in Seconds: MKS Announces Ophir® FluxGage™ 604 Measurement System MKS Instruments, Inc. (NASDAQ: MKSI) has announced the Ophir® FluxGage™ 604 compact measurement system for LED luminaires. This new series features four additional color sensors evenly arranged in the bottom of the device delivering further x,y, and CCT data as well as the illuminance. Within ... Read more »

EDITORIAL

CIE Position Statement on the Use of UV Radiation to Manage the Risk of COVID-19 Transmission

CIE Position Statement on the Use of UV Radiation to Manage the Risk of COVID-19 Transmission The coronavirus disease (COVID-19) pandemic has accelerated the search for environmental controls to contain or mitigate the spread of the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) responsible for the disease. SARS-CoV-2 is usually transmitted from person to person by contact ... Read more »

EDITORIAL

Tech-Talks BREGENZ - Prof. Ruairí O'Brien, Founder of Ruairí O'Brien Lighting Design

Tech-Talks BREGENZ - Prof. Ruairí O'Brien, Founder of Ruairí O'Brien Lighting Design Ruairí O'Brien, associate professor and head of the Architecture and Visual design department at the German University in Cairo and CEO of Ruairí O'Brien. Architektur. Licht Raumkunst, surprised and delighted the audience with his lecture at LpS 2016 when he talked about allowing darkness. He ... Read more »

EDITORIAL

See and Be Seen: New LED from Osram Ensures Optimal Visibility in Dense Fog

See and Be Seen: New LED from Osram Ensures Optimal Visibility in Dense Fog Dense fog and poor visibility repeatedly lead to serious rear-end collisions. In poor weather conditions, good visibility through a bright rear fog light is very important. The Synios P2720 CR from Osram provides many benefits to manufacturers of rear combination lamps, such as enabling compact ... Read more »