Checks validity condition

Check if validity condition for transmission rate calculation based on equilibrium prevalence is verified.

get_validity_condition_vivax(I, r, f, gamma, alpha, beta, delta)

Arguments

I

proportion of infectious individuals at equilibrium (I0+Il)

r

blood clearance rate

f

relapse frequency

gamma

liver clearance rate

alpha

effective treatment probability

beta

probability of liver clearance

delta

importation rate

Value

A scalar giving the condition. If negative, the solution exists. If positive there is no positive solution for lambda.