MultiInsecticideIRSHousingModification

The MultiInsecticideIRSHousingModification intervention class is an individual-level intervention that builds on the IRSHousingModification class by enabling the use of multiple insecticides. The killing efficacy of each insecticide can be specified. This class uses Indoor Residual Spraying (IRS), where insecticide is sprayed on the interior walls of houses such that mosquitoes resting on the walls after consuming blood meals will die.

The effectiveness of the intervention is combined using the following equation:

Total efficacy = 1.0 – (1.0 – efficacy_1) * (1.0 – efficacy_2) * … * (1.0 – efficacy_n)

At a glance:

• Distributed to: Individuals

• Serialized: Yes, if it has been distributed to a person.

• Uses insecticides: Yes. It can target specific species or other subgroups.

• Time-based expiration: No

• Purge existing: Yes. If a new intervention is added to to the individual, the existing intervention of the same name is removed when the new one is added.

• Vector killing contributes to: Indoor Die After Feeding

• Vector effects: Repelling and killing

• Vector sexes affected: Females only

• Vector life stage affected: Adult

Warning

EMOD simulations models nodes and individuals within nodes; they do not model houses. Therefore, housing modifications are received by individuals, not houses.

Use of this class and other housing modification classes requires caution because they can have unintended effects. For example, individuals in the same household may receive different housing modification interventions. An individual receiving a housing modification intervention who then migrates to another node will continue to receive that intervention. We recommend that you configure your simulation to take these logical inconsistencies into account.

Note

Parameters are case-sensitive. For Boolean parameters, set to 1 for true or 0 for false. Minimum, maximum, or default values of “NA” indicate that those values are not applicable for that parameter.

EMOD does not use true defaults; that is, if the dependency relationships indicate that a parameter is required, you must supply a value for it. However, many of the tools used to work with EMOD will use the default values provided below.

JSON format does not permit comments, but you can add “dummy” parameters to add contextual information to your files. Any keys that are not EMOD parameter names will be ignored by the model.

The table below describes all possible parameters with which this class can be configured. The JSON example that follows shows one potential configuration.

Parameter	Data type	Minimum	Maximum	Default	Description	Example
Cost_To_Consumer	float	0	999999	8	The unit cost per housing modification (unamortized).	{ "Cost_To_Consumer": 8 }
Insecticides	array of json objects	None	None	[]	An array of objects defining the blocking and killing efficacy of each insecticide.	{ "Insecticides": [ { "Insecticide_Name": "pyrethroid", "Repelling_Config": { "Box_Duration": 300, "Initial_Effect": 0.25, "class": "WaningEffectBox" }, "Killing_Config": { "Box_Duration": 300, "Initial_Effect": 1.0, "class": "WaningEffectBox" } }, { "Insecticide_Name": "carbamate", "Repelling_Config": { "Box_Duration": 300, "Initial_Effect": 0.25, "class": "WaningEffectBox" }, "Killing_Config": { "Box_Duration": 300, "Initial_Effect": 1.0, "class": "WaningEffectBox" } } ] }
Intervention_Name	string	NA	NA	MultiInsecticideIRSHousingModification	The optional name used to refer to this intervention as a means to differentiate it from others that use the same class.	{ "Intervention_Config": { "class": "MultiInsecticideIRSHousingModification", "Intervention_Name": "Indoor DDT spraying" } }
Killing_Config	json object	NA	NA	NA	The configuration of killing efficacy and waning for housing modification. Killing is conditional on the vector not being repelled before feeding. Specify how this effect decays over time using one of the Waning effect classes.	{ "Killing_Config": { "Box_Duration": 3650, "Initial_Effect": 0.53429, "class": "WaningEffectBox" } }
Repelling_Config	json object	NA	NA	NA	Defines a waning effect that determines the probability that a vector is repelled due to the intervention. Specify how this effect decays over time using one of the Waning effect classes.	{ "Repelling_Config": { "Box_Duration": 3650, "Initial_Effect": 0.0, "class": "WaningEffectBox" } }

{
    "class": "MultiInsecticideIRSHousingModification",
    "Cost_To_Consumer": 1.0,
    "Insecticides": [{
            "Insecticide_Name": "pyrethroid",
            "Repelling_Config": {
                "Box_Duration": 300,
                "Initial_Effect": 0.25,
                "class": "WaningEffectBox"
            },
            "Killing_Config": {
                "Box_Duration": 300,
                "Initial_Effect": 1.0,
                "class": "WaningEffectBox"
            }
        },
        {
            "Insecticide_Name": "carbamate",
            "Repelling_Config": {
                "Box_Duration": 300,
                "Initial_Effect": 0.25,
                "class": "WaningEffectBox"
            },
            "Killing_Config": {
                "Box_Duration": 300,
                "Initial_Effect": 1.0,
                "class": "WaningEffectBox"
            }
        }
    ]
}