Hc (Haemonchus contortus) / sensitive / resistant
Tc (Trichostrongylus colubriformis) / sensitive / resistant

Treatment exposure modality:	Immersion for 144h
Efficacy type:	Motility reduction (%)
Stock solution:	20 mM in DMSO
Compound quantity	< 2 mg
Positive control	Ivermectin

In Brief:

The Invenesis GI larval devlopment assay measures the effect of
compounds on the motility of freshly developed L3 larvae.

Eggs of a gastrointestinal nematode are deposited in a
multi-well plate together with food (E. coli) and the treatment formulated in
DMSO. Plates are incubated for up to 6 days to allow the development of
nematodes up to the L3-stage. The effect of compounds is measured as motility
reduction using an automated data acquisition system. Efficacy is expressed in %
motility reduction compared to negative controls.

Definitions:

To ensure flawless communication, the following definition section introduces the vocabulary used at INVENesis. You will find this vocabulary on our quotes, raw data files, processed data files, preliminary and final reports. Open the Lexicon below.

Lexicon

Assay Preparation:

Test plate: microplate in which an assay is run
Mother plate: microplate containing stock solutions
Stock solution: solution contained in mother plates out of which dilutions will be made
Daugher plate: microplate containing solutions used to treat test plates, usually dilution series

Type of Assays:

Organism-based assays : functional assay measuring a phenotypic response on a whole organism. Typically, motility, development, deterrency, repellency.
Electrophysiology assays: functional assay measuring the electrical respons of a receptor or an organ to a stimulus
Stock solution: solution contained in mother plates out of which dilutions will be made
Daugher plate: microplate containing solutions used to treat test plates, usually dilution series

Treatment exposure modalities:

Treatment modalities relate to the way the treatment is applied. Different treatment modalities help define how an active ingredient is most susceptible to act in a field case. Some compounds are more active when eaten, others are more active when applied externally on an organism. The following vocabulary is used in the list of assays:

Tarsal:

Tarsal: individuals are allowed to walk on surfaces treated with a formulated active ingredient.
Tarsal with choice: only a proportion of the surface accessible to individuals is treated.
Tarsal without choice: the whole surface accessible to individuals is treated so that individuals are unable to rest on untreated surfaces.

Topical:

Topical: direct application of a known amount of formulated active ingredient on a single individual

Oral:

Oral: voluntary feeding on medium treated with a formulated active ingredient.
Oral with choice: both a treated and an untreated medium are provided.
Oral without choice: only one treated medium is provided.

Immersion:

Immersion: individuals are immersed in a treated formulation.
Permanent Immersion: individuals are immersed for the whole duration of the assay.
Temporary Immersion: the treatment is removed after temporary immersion of individuals.