27.2 Two Age-Class Parasite Model Equations
ADULTS(t) ¼ ADULTS(t À dt) + (MATURING À ADULT_DYING) * dt
INIT ADULTS ¼ .10 {Individuals}
INFLOWS:
MATURING ¼ MNSF * NYMPHS * (1ÀIC)/TN {Individuals per Day}
OUTFLOWS:
ADULT_DYING ¼ ADULTS * (1-EXP(LN(EASF)/TA * DT))/DT {Individuals per
Day}
ADULTS_D(t) ¼ ADULTS_D(t À dt) + (MATURING_D + I_R À D_ADULT_
DYING) * dt
INIT ADULTS_D ¼ .10 {Individuals}
INFLOWS:
MATURING_D ¼ MNSF_D * NYMPHS_D/TN_D
I_R ¼ INFECTION_RATE {Individuals per Day}
OUTFLOWS:
D_ADULT_DYING ¼ ADULTS_D * (1-EXP(LN(EASF_D)/TA_D * DT))/DT
{Individuals per Day}
NYMPHS(t) ¼ NYMPHS(t À dt) + (BIRTHING À DYING À MATURING À
INFECTION_RATE) * dt
INIT NYMPHS ¼ 0 {Individuals}
INFLOWS:
BIRTHING ¼ LAY_RATE * ADULTS {Individuals per Day}
OUTFLOWS:
DYING ¼ (1 À MNSF) * NYMPHS/DT
MATURING ¼ MNSF * NYMPHS * (1ÀIC)/TN {Individuals per Day}
INFECTION_RATE ¼ MNSF * IC * NYMPHS/TN
Fig. 27.2
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27 Two Age-Class Parasites