ignorance would increase the rate at which the disease gets passed on from the
infective to the susceptible population.
The birth and natural death rates are specified graphically in this model as shown
in Figs. 21.8 and 21.9 respectively.
CONTRACTING is a function of susceptible, healthy people coming into
contact with people who are aware that they are contagious mixed in with people
who are immune:
CONTRACTING ¼ IF IMMUNE > 0 THEN CC Ã NON IMM Ã CONTAGIOUS ELSE 0
ð21:3Þ
The VACCINATING biflow is specified as
VACCINATING ¼ VAC FRACTION
à NON IMM
ð21:4Þ
and contains the rate of vaccination. A flow from IMMUNE to NONIMMUNE
captures 1.5 % of immune people that lose their immunity (Fig. 21.10).
Fig. 21.8
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21 Infectious Diseases
infective to the susceptible population.
The birth and natural death rates are specified graphically in this model as shown
in Figs. 21.8 and 21.9 respectively.
CONTRACTING is a function of susceptible, healthy people coming into
contact with people who are aware that they are contagious mixed in with people
who are immune:
CONTRACTING ¼ IF IMMUNE > 0 THEN CC Ã NON IMM Ã CONTAGIOUS ELSE 0
ð21:3Þ
The VACCINATING biflow is specified as
VACCINATING ¼ VAC FRACTION
à NON IMM
ð21:4Þ
and contains the rate of vaccination. A flow from IMMUNE to NONIMMUNE
captures 1.5 % of immune people that lose their immunity (Fig. 21.10).
Fig. 21.8
176
21 Infectious Diseases