Project 063

Membrane feeding system for large-scale breeding of the bed bug Cimex lectularius and the body louse Pediculus humanus humanus in the laboratory

Dr. Arlette Vander Pan  & Anne Krüger
Umweltbundesamt, Berlin

07/2017 - 06/2019

The feeding of blood sucking insects on vertebrates represents an animal experiment. Changing to membrane feeding of bed bugs and body lice for laboratory rearing can replace such animal experiments.

Blood sucking arthropods (e.g. lice, bed bugs, mosquitoes, fleas and ticks) significantly affect human health. Infestations with head lice are a worldwide hygiene problem. Since the late 1990s, the numbers of bed bug infestations in public buildings and private homes are dramatically increasing. Due to the fact that these parasites develop resistance against insecticides, the need of new active substances and products for their control is evident. Furthermore, the demand for efficacy testing increases, for the development of new products and active ingredients as well as for regulatory purposes (e. g. proof of efficacy for authorization of biocidal products according to the Biocidal Product Regulation, BPR Regulation EU 528/2012). It is important and necessary to have efficient products for control of blood sucking arthropods available, but efficacy testing of these products before introduction to the market is highly dependent on laboratory breeding of these parasites. However, the feeding of blood sucking arthropods on a vertebrate host (e.g. rabbits, guinea pigs) is an animal experiment according to the Animal Protection Act and has to be approved by the competent authorities. A feeding technique for bed bugs and body lice without conducting animal experiments would enable laboratories to perform important basic and applied research with these organisms.

The objective of this project is the development and establishment of a feeding technique for large-scale breeding of bed bugs and body lice without the use of vertebrate hosts.

 

Fig. 1:   Bed bug.

Fig. 2:   Body louse.

Present membrane feeding techniques are available for mosquitoes, ticks, kissing bugs, lice and bed bugs. At the moment, feeding techniques for bed bugs (fig. 1) and lice (fig. 2) are only suitable for the breeding of small numbers and not appropriate for a successful permanent establishment of large laboratory colonies. Most breeding methods are very complex and produce not enough offspring for permanent keeping and efficacy testing, and laboratory colony collapses are a frequent phenomenon.

Despite the occurrence of several of such breeding collapses in the past, large numbers of bed bugs are maintained with the membrane feeding prototype (fig. 3) in the 14th generation at the German Environment Agency. The feeding method is continually revised but needs to be improved for everyday use. With a new system, an easy and uncomplicated feeding process should be feasible. Since body lice are suitable model organisms for head lice, experiments on body lice feeding and rearing will also be conducted within the project period.

 

 

Fig. 3:
Diagram of the membrane feeding system (prototype, not scaled) which is currently being used for bed bug feeding. The blood temperature in the feeding units is regulated to 37 to 38 degrees by a water bath, which is warmed up by a heat thermostat with an integrated pump. Bed bugs are placed on the membrane (double stretched parafilm) in a vial closed with gaze.

 

 

Institution

Umweltbundesamt
Corrensplatz 1 (Haus 23)
14195 Berlin, Germany

Duration

07/2017 - 06/2019