private void PersonExposed(Human agent, IRandomProvider random)
{
var symptoms = Parameters.SymptomWeights.Sample(random);
agent.Symptoms = symptoms;
var incubationRate = 1d / Parameters.IncubationPeriod;
agent.IncubationPeriod = random.SampleDaysInState(incubationRate);
var infectiousRate = 1d / Parameters.TimeInfectious;
agent.DaysInfectious = random.SampleDaysInState(infectiousRate);
}
private void IncubationEndsSevere(Human agent, IRandomProvider random)
{
agent.SevereToHospital = random.Chance(Parameters.PropStoH);
var meanTimeToAdmission = agent.SevereToHospital ? Parameters.TimeStoH : Parameters.TimeStoC;
var progressionRate = 1d / meanTimeToAdmission;
agent.DaysIsolated = random.SampleDaysInState(progressionRate);
}
private void PersonMovedToIcu(Human agent, IRandomProvider random)
{
agent.DiesInIcu = random.Chance(Parameters.PropDieInIcu);
var meanTimeInIcu = agent.DiesInIcu ? Parameters.TimeCtoD : Parameters.TimeCtoR;
var rateOfExit = 1d / meanTimeInIcu;
agent.DaysInIntensiveCare = random.SampleDaysInState(rateOfExit);
}
private void PersonAdmitToHospital(Human agent, IRandomProvider random)
{
agent.HospitalOutcome = Parameters.HospitalizationOutcomes.Sample(random);
var meanLengthOfStay = agent.HospitalOutcome switch
{
HospitalOutcome.Recover => Parameters.TimeHtoR,
HospitalOutcome.IntensiveCare => Parameters.TimeHToC,
HospitalOutcome.Die => Parameters.TimeHtoD,
_ => throw new InvalidEnumArgumentException(
$"Mean time in hospital for outcome {agent.HospitalOutcome} has not been mapped in the disease parameters")
};
var dischargeRate = 1d / meanLengthOfStay;
agent.DaysInHospital = random.SampleDaysInState(dischargeRate);
}
private void AgentExposed(SirAgent agent, IRandomProvider random)
{
agent.IncubationTime = random.SampleDaysInState(agent.SirContext.SigmaParam);
}
private void AgentBecomesInfectious(SirAgent agent, IRandomProvider random)
{
agent.InfectiousDays = random.SampleDaysInState(agent.SirContext.GammaParam);
}