SimpleBednet

The SimpleBednet intervention class implements Insecticide-Treated Nets (ITNs) in the simulation. ITNs are a key component of modern malaria control efforts, and have recently been scaled up towards universal coverage in sub-Saharan Africa. Modern bednets are made of a polyethylene or polyester mesh, which is impregnated with a slowly releasing pyrethroid insecticide. Mosquitoes that are seeking a blood meal will encounter a net and, if the net retains its physical integrity and has been correctly installed, the feeding attempt is blocked. Blocked feeding attempts also carry the possibility of killing the mosquito. Net ownership is configured through the demographic coverage, and the blocking and killing rates of mosquitoes are time- dependent.

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

Blocking_Config

JSON object

NA

NA

NA

Configures the rate of blocking for indoor mosquito feeds on individuals with an ITN. Specify how this effect decays over time using one of the Waning effect classes.

 
{
    "Blocking_Config": {
        "Box_Duration": 3650,
        "Initial_Effect": 0,
        "class": "WaningEffectBox"
    }
}

Cost_To_Consumer

float

0

999999

3.75

The unit cost per bednet (unamortized)

 
{
    "Cost_To_Consumer": 4.5
}

Disqualifying_Properties

array of strings

NA

NA

[]

A list of IndividualProperty key:value pairs that cause an intervention to be aborted (persistent interventions will stop being distributed to individuals with these values). See NodeProperties and IndividualProperties parameters for more information. Generally used to control the flow of health care access. For example, to prevent the same individual from accessing health care via two different routes at the same time.

 
{
    "Disqualifying_Properties": [
        "InterventionStatus:LostForever"
    ]
}

Dont_Allow_Duplicates

boolean

0

1

0

If an individual’s container has an intervention, set to true (1) to prevent them from receiving another copy of the intervention. Supported by all intervention classes.

 
{
    "Dont_Allow_Duplicates": 0
}

Intervention_Name

string

NA

NA

NA

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": "SimpleBednet",
        "Intervention_Name": "Northern region bednet distribution"
    }
}

Killing_Config

JSON object

NA

NA

NA

The configuration of the rate at which mosquitoes die, conditional on a successfully blocked feed. 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"
    }
}

New_Property_Value

string

NA

NA

NA

An optional IndividualProperty key:value pair that will be assigned when the intervention is distributed. See NodeProperties and IndividualProperties parameters for more information. Generally used to indicate the broad category of health care cascade to which an intervention belongs to prevent individuals from accessing care through multiple pathways. For example, if an individual must already be taking a particular medication to be prescribed a new one.

 
{
    "New_Property_Value": "InterventionStatus:None"
}

Usage_Config

JSON object

NA

NA

NA

The user-defined WaningEffects to determine when and if an individual is using a bed net. Specify how this effect decays over time using one of the Waning effect classes.

 
{
    "Usage_Config": {
        "class": "WaningEffectConstant",
        "Initial_Effect": 1.0
    }
}

{
    "Events": [{
        "class": "CampaignEvent",
        "Nodeset_Config": {
            "class": "NodeSetAll"
        },
        "Start_Day": 1460,
        "Event_Coordinator_Config": {
            "class": "StandardInterventionDistributionEventCoordinator",
            "Target_Demographic": "Everyone",
            "Demographic_Coverage": 0.7,
            "Intervention_Config": {
                "class": "SimpleBednet",
                "Cost_To_Consumer": 3.75,
                "Killing_Config": {
                    "Initial_Effect": 0.6,
                    "Decay_Time_Constant": 1460,
                    "class": "WaningEffectExponential"
                },
                "Blocking_Config": {
                    "Initial_Effect": 0.9,
                    "Decay_Time_Constant": 730,
                    "class": "WaningEffectExponential"
                },
                "Usage_Config": {
                    "class": "WaningEffectConstant",
                    "Initial_Effect": 1.0
                }
            }
        }
    }],
    "Use_Defaults": 1
}