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Extra credit (10 points) 7. (Sexually transmitted diseases) Gonorrhoea is a bacterial infection and confers very little, if any, immunity. A large proportion of infectious females are asymptomatic (i.c. show no symptoms/indications of the disease) The following model describes the spread of gonorrhoea in a heterosexual population (males and females). What do variables Si, S2 1. 1 describe? Write one sentence. DS =-1.3, +7 dt dl = P27,5,-v, dt ds dr dl dt BIS. -V,12 What is the meaning of B, and B? Why should be different from B? And which one is typically larger? Explain in one or two sentences What is the meaning of v, and V,? Why should vi be different from V,? Explain in one or two sentences. Extra credit (10 points) 7. (Sexually transmitted diseases) Gonorrhoea is a bacterial infection and confers very little, if any, immunity. A large proportion of infectious females are asymptomatic (i.c. show no symptoms/indications of the disease) The following model describes the spread of gonorrhoea in a heterosexual population (males and females). What do variables Si, S2 1. 1 describe? Write one sentence. DS =-1.3, +7 dt dl = P27,5,-v, dt ds dr dl dt BIS. -V,12 What is the meaning of B, and B? Why should be different from B? And which one is typically larger? Explain in one or two sentences What is the meaning of v, and V,? Why should vi be different from V,? Explain in one or two sentences