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  ______     ___     _    _      ___     _    _   
 /_   _//   / _ \\  | |  | ||   / _ \\  | \  / || 
 `-| |,-   | / \ || | |/\| ||  | / \ || |  \/  || 
   | ||    | \_/ || |  /\  ||  | \_/ || | .  . || 
   |_||     \___//  |_// \_||   \___//  |_|\/|_|| 
   `-`'     `---`   `-`   `-`   `---`   `-`  `-`

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