Answer:
Differential equation = N(t) = S(t) + L(t) + I(t) + R(t) + D(t)
where;
S(t) is the number of infected individuals at time t;
L= Individuals who are infected but not infectious yet
I = the class of infected, infectious, and isolated individuals;
R = group of recovered individuals;
D(t) = the number of individuals who died of EVD at time t.
