SEIR Model with Vaccination

Adds Exposed compartment and vaccination flow to the basic SIR.

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digraph seir {
  rankdir=LR;
  graph [bgcolor=transparent];
  node [shape=circle, style=filled, fontname=Inter, fontsize=12];

  S [label="S", fillcolor="#dcfce7"];
  E [label="E", fillcolor="#fef3c7"];
  I [label="I", fillcolor="#fee2e2"];
  R [label="R", fillcolor="#dbeafe"];
  V [label="V", fillcolor="#ede9fe"];

  S -> E [label="β·SI/N"];
  E -> I [label="σ·E"];
  I -> R [label="γ·I"];
  S -> V [label="ν"];
  V -> S [label="waning ω", style=dashed];
}