I stay with this Quiz.
Compartment Chain
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Build the SIS chain
The middle is fixed. Place the remaining compartments until the return flow becomes visible.
I Infectious People who can pass the disease on.
Exactly right.
SIS returns people to S after the infectious phase. The model does not assume lasting immunity; recovered people can become susceptible again.
Multiple Choice
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Choose the SIS premise
One answer fits the model.
Ready.
Exactly right.
SIS models no permanent immunity: after the infectious phase, people become susceptible again.
Matching Game
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Match the SIS assumptions
Which statement belongs to which model element?
Ready.
Exactly right.
SIS sends people back to S after the infectious phase. The model fits infections where recovery does not create lasting protection.