Larvicides#

The Larvicides intervention class is a node-level intervention that configures habitat reduction for mosquito breeding sites that are poisoned by larvicides. This intervention accommodates sprayed areas and vector-transported larvicides where resting surfaces may be treated not just with IRSHousingModification to kill mosquitoes, but also with particles that can be dispersed by mosquitoes to poison larval development sites. In particular, a relatively small fraction of resting events may result in a relatively large fraction of larval habitat.

At a glance:

  • Distributed to: Nodes

  • Serialized: No, it needs to be redistributed when starting from a serialized file.

  • Uses insecticides: Yes. The vector genome can be used to target specific genders.

  • Time-based expiration: No. It will continue to exist even if efficacy is zero.

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

  • Vector killing contributes to: Combines with competition and rainfall to kill larvae every time step.

  • Vector effects: Killing

  • Vector sexes affected: Both males and females

  • Vector life stage affected: Larval

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

10

The unit cost per vector control (unamortized).

 
{
  "Cost_To_Consumer": 8
}

Disqualifying_Properties

array of strings

NA

NA

[]

A list of NodeProperty key:value pairs that cause an intervention to be aborted (persistent interventions will stop being distributed to nodes 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"
  ]
}

Habitat_Target

enum

NA

NA

NONE

The larval habitat type targeted for larvicide. This is a required parameter. NONE is the default to ensure the user selects it. If not ALL_HABITATS, then the type must be one of those configured in Vector_Species_Params, Habitats. See Larval habitat parameters for more information. Possible values are:

  • NONE - Default but not allowed; it must be defined.

  • TEMPORARY_RAINFALL

  • WATER_VEGETATION

  • HUMAN_POPULATION

  • CONSTANT

  • BRACKISH_SWAMP

  • LINEAR_SPLINE

  • ALL_HABITATS

 
{
  "Habitat_Target": "WATER_VEGETATION"
}

Insecticide_Name

string

NA

NA

UNINITIALIZED STRING

The name of the insecticide defined in the configuration parameter Insecticides for this intervention. If insecticides are being used, this must be defined as one of those values; if they are not being used this can be empty. It cannot have a value if you did not configure the configuration parameter Insecticides.

 
{
  "Insecticide_Name": "carbamate"
}

Intervention_Name

string

NA

NA

Larvicides

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": "Larvicides",
    "Intervention_Name": "Themiphos application"
  }
}

Larval_Killing_Config

json object

NA

NA

NA

The configuration of larval killing efficacy and waning for targeted stage. Specify how this effect decays over time using one of the Waning effect classes.

 
{
  "Larval_Killing_Config": {
    "Box_Duration": 100,
    "Decay_Time_Constant": 150,
    "Initial_Effect": 0.2,
    "class": "WaningEffectBoxExponential"
  }
}

New_Property_Value

string

NA

NA

“”

An optional NodeProperty key:value pair that will be assigned when the intervention is applied. See NodeProperties and IndividualProperties parameters for more information.

 
{
  "New_Property_Value": "HasHealthCare:YES"
}

Spray_Coverage

float

0

1

1

The portion of the node that has been sprayed. This value is multiplied by the current efficacy of the WaningEffect.

 
{
  "Spray_Coverage": 0.6
}

{
    "Events": [{
        "class": "CampaignEvent",
        "Nodeset_Config": {
            "class": "NodeSetAll"
        },
        "Start_Day": 140,
        "Event_Coordinator_Config": {
            "class": "StandardInterventionDistributionEventCoordinator",
            "Intervention_Config": {
                "Cost_To_Consumer": 3.75,
                "Spray_Coverage": 0.6,
                "Habitat_Target": "ALL_HABITATS",
                "Larval_Killing_Config": {
                    "Box_Duration": 3650,
                    "Initial_Effect": 0.1,
                    "class": "WaningEffectBox"
                },
                "class": "Larvicides"
            }
        }
    }],
    "Use_Defaults": 1
}