Table 1 Connotation of variables or parameters

S

Susceptible (healthy)

I

Infected (symptomless, undiscovered)

D

Diagnosed (symptomless,discovered)

A

Ailing (symptomatic, undiscovered)

R

Recognized (symptomatic, discovered)

T

Threatened (infectious, discovered)

H

Healed

E

Extinct

m

Percentage of infected after S and I tough

n

Percentage of infected after S and D tough

p

Possibility of infected after S and A tough

q

Odds of infected after S and R tough

a

Probability of detection of asymptomatic carriers

b

Probability of detection of symptomatic carriers

c

Probability of symptoms in the undetected

e

Probability of symptoms being detected

g

Probability that A have life-threatening symptoms

j

Probability that R have life-threatening symptoms

o

Death ratio of T

u

Heal ratio of I

v

Heal ratio of A

w

Heal ratio of R

r

Heal ratio of D

z

Heal ratio of T