Abstract
Background: Molecular xenomonitoring (MX), the testing of insect vectors for the presence of human pathogens, has the potential to provide a non-invasive and cost-effective method for monitoring the prevalence of disease within a community. Current MX methods require the capture and processing of large numbers of mosquitoes, particularly in areas of low endemicity, increasing the time, cost and labour required. Screening the excreta/feces (E/F) released from mosquitoes, rather than whole carcasses, improves the throughput by removing the need to discriminate vector species since non-vectors release ingested pathogens in E/F. It also enables larger numbers of mosquitoes to be processed per pool. However, this new screening approach requires a method of efficiently collecting E/F. Methods: We developed a cone with a superhydrophobic surface to allow for the efficient collection of E/F. Using mosquitoes exposed to either Plasmodium falciparum, Brugia malayi or Trypanosoma bruceibrucei, we tested the performance of the superhydrophobic cone alongside two other collection methods. Results: All collection methods enabled the detection of DNA from the three parasites. Using the superhydrophobic cone to deposit E/F into a small tube provided the highest number of positive samples (16 out of 18) and facilitated detection of parasite DNA in E/F from individual mosquitoes. Further tests showed that following a simple washing step, the cone can be reused multiple times, further improving its cost-effectiveness. Conclusions: Incorporating the superhydrophobic cone into mosquito traps or holding containers could provide a simple and efficient method for collecting E/F. Where this is not possible, swabbing the container or using the washing method facilitates the detection of the three parasites used in this study.
Highlights
The screening of insect vectors for the presence of DNA or RNA from human pathogens is known as molecular xenomonitoring (MX)
Using the superhydrophobic cone to collect E/F material in a 1.5 ml tube offered the highest rate of detection across the three different parasites (Table 1), with 16 out of 18 samples showing positive for the presence of parasite DNA, followed by the wash method (14/18), superhydrophobic cone + FTA (13/18) and the swab method (12/18)
The detection of B. malayi DNA was highly variable between the different collection methods, ranging from 2 out of 6 samples showing positive for the swab method compared to 5 out of 6 for superhydrophobic cone + tube
Summary
The screening of insect vectors for the presence of DNA or RNA from human pathogens is known as molecular xenomonitoring (MX). Molecular xenomonitoring (MX), the testing of insect vectors for the presence of human pathogens, has the potential to provide a non-invasive and cost-effective method for monitoring the prevalence of disease within a community. Screening the excreta/feces (E/F) released from mosquitoes, rather than whole carcasses, improves the throughput by removing the need to discriminate vector species since non-vectors release ingested pathogens in E/F It enables larger numbers of mosquitoes to be processed per pool. Conclusions: Incorporating the superhydrophobic cone into mosquito traps or holding containers could provide a simple and efficient method for collecting E/F Where this is not possible, swabbing the container or using the washing method facilitates the detection of the three parasites used in this study
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