Table 1. Model parameters: Description and value.

Parameter	Description	Value	Rate of flow
σ1	Period of latency	1 week	1/σ1
σ2	Time to infectiousness	1 week	1/σ2
τ	Time to seek treatment	0.5 week	1/τ
q	Drug recovery period	1 week	1/q
-	Natural recovery period	12 weeks	1/δ
p	Probability of treatment	0, 0.1, 0.5, 1
N	Population Size	1000 people
β	Contact Rate	10 per annum	β
λ	Force of Infection	β×I/N(Models 1,2&3) β×(Iu+It)/N(Models 4, 5&6)