Related Experiment Video
Updated: Mar 7, 2026
Experimental Viral Infection in Adult Mosquitoes by Oral Feeding and Microinjection
Published on: July 28, 2022
Brugia malayi microfilariae transport alphaviruses across the mosquito midgut
Jefferson A Vaughan1, Michael J Turell1
1Virology Division, U.S. Army Medical Research Institute for Infectious Diseases, Fort Detrick, Maryland, United States of America.
Abstract:
Concurrent ingestion of microfilariae (MF) and arboviruses by mosquitoes can enhance mosquito transmission of virus compared to when virus is ingested alone. Within hours of being ingested, MF penetrate the mosquito midgut and introduce virus into mosquito hemocoel, creating a disseminated viral infection much sooner than normal. How virus is actually introduced is not known. In this report, we present experimental evidence that suggests that certain alphaviruses may adhere or otherwise associate with sheathed Brugia malayi MF in the blood of a dually-infected host and that the virus is carried into the mosquito hemocoel by the MF during their penetration of the mosquito midgut. The mechanism of MF enhancement may be more complex than simple leakage of viremic blood into the hemocoel during MF penetration. The affinity of arboviruses to adhere to or otherwise associate with MF may depend on the specific combination of the virus and MF involved in a dual host infection. This in turn may determine the relative importance that MF enhancement has within an arbovirus transmission system.
Insights
Mosquitoes ingesting microfilariae (MF) and arboviruses together transmit viruses more effectively. Evidence suggests viruses may attach to MF, aiding their transport into the mosquito, enhancing arbovirus transmission.
Area of Science:
- Vector-borne diseases
- Parasitology
- Virology
Background:
- Mosquitoes co-ingesting microfilariae (MF) and arboviruses show enhanced virus transmission.
- Microfilariae penetrate the mosquito midgut, potentially introducing viruses into the hemocoel prematurely.
Purpose of the Study:
- To investigate the mechanism by which microfilariae enhance arbovirus transmission.
- To determine if arboviruses associate with microfilariae during co-ingestion by mosquitoes.
Main Methods:
- Experimental evidence was gathered on the interaction between alphaviruses and sheathed Brugia malayi MF.
- Mosquitoes were experimentally infected with both arboviruses and MF to observe transmission dynamics.
Main Results:
- Experimental data suggest certain alphaviruses adhere to or associate with Brugia malayi MF.
- This association facilitates the transport of viruses into the mosquito hemocoel via MF penetration of the midgut.
Conclusions:
- Microfilariae may enhance arbovirus transmission by carrying viruses into the mosquito hemocoel.
- The specific virus-MF combination influences the degree of adherence and subsequent transmission enhancement.
- This interaction highlights a complex mechanism beyond simple blood leakage in arbovirus transmission systems.
