Diagrams commissioned for the paper: *The Operational Loops of a Pandemic.* by T. D. Sampson and J. Parikka.
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\documentclass{article}
\usepackage{tikz}
\usetikzlibrary{arrows}
\tikzset{
vertex/.style={circle,draw,minimum size=1.5em},
edge/.style={->,> = latex'}
}
\begin{document}
\begin{tikzpicture}
% vertices
\node[vertex] (1) at (0,0) {$1$};
\node[vertex] (2) at (2,0) {$2$};
\node[vertex] (3) at (0,-2) {$3$};
\node[vertex] (4) at (2,-2) {$4$};
\node[vertex] (5) at (-2,-2) {$5$};
%edges
\draw[edge] (1) -- (2) node[midway, above] {$\frac{1}{3}$};
\draw[edge] (1.260) -- (3.100);
\draw[edge] (1.325) -- (4.125) node[pos=.3, right, sloped, rotate=90] {$\frac{1}{3}$};
\draw[edge] (2) -- (3);
\draw[edge] (2) -- (4) node[midway, right] {$\frac{1}{2}$};
\draw[edge] (3.80) -- (1.280);
\draw[edge] (4) -- (3);
\draw[edge] (4.145) -- (1.305);
\draw[edge] (3.170) -- (5.10);
\draw[edge] (5.350) -- (3.190);
\end{tikzpicture}
\end{document}