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| |  | ||   / _ \\  |      \\  /_   _//  / ____|| 
| |/\| ||  / //\ \\ |  --  //   -| ||-  / //---`' 
|  /\  || |  ___  |||  --  \\   _| ||_  \ \\___   
|_// \_|| |_||  |_|||______//  /_____//  \_____|| 
`-`   `-` `-`   `-` `------`   `-----`    `----`

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Text this: Delay SIR model with nonlinear incident rate and varying total population