Diagrams commissioned for the paper: *The Operational Loops of a Pandemic.* by T. D. Sampson and J. Parikka.
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% from this example https://tex.stackexchange.com/questions/305375/how-to-position-labels-at-edges-of-tikz-figures/305391
\documentclass{article}
\usepackage{tikz}
\usetikzlibrary{arrows.meta,positioning}
\usepackage{geometry}
\geometry{a4paper, landscape, margin=1cm}
\pagenumbering{gobble}
\setlength\parindent{0pt}
\begin{document}
{\huge Operational loop of COVID-19}\\
\\
David Benqu\'e\\
\color{red}
Work in Progress: \today
\color{black}
\vspace{3\baselineskip}
% \section*{Operational loop of COVID-19}
\begin{tikzpicture}[>={Stealth[scale=2]}, % arrow head
shorten > = 3pt,
node distance = 5cm and 4cm,
el/.style = {inner sep=5pt, font=\normalsize, align=center, sloped},
state/.style = {minimum size=2.5cm, circle, draw=black, fill=white}, %node styles
sub/.style = {rectangle, xshift=2.5cm}
% every label/.append style = {font=\tiny}, unused node labels
]
\node (simulations) [state, align=center] {Models\\\&\\Simulations};
\node (data) [state, right=of simulations] {Data};
\node (virus) [state, left=of simulations, yshift=-3.7cm] {SARS-CoV-2};
\node (curves) [state,below=of simulations] {Curves};
\node (policy) [state,below=of data, align=center] {Policy\\Interventions};
\node (bodies) [state, right=of policy, yshift=3.7cm] {Populations};
\node (futures1) [sub, left=of simulations,yshift=0.7cm] {Thousands};
\node (futures2) [sub, left=of simulations] {of};
\node (futures3) [sub, left=of simulations, yshift=-0.7cm] {Futures};
\path[->]
(simulations) edge [in=110,out=70,max distance=1.5cm,loop] node[el,above] {Runs and re-runs} (simulations)
(virus) edge [in=110,out=70,max distance=1.5cm,loop] node[el, above] {Mutates} (virus)
(virus) edge [bend left=5] node[el, above, pos=0.15] {Infects} (bodies)
(bodies) edge [bend left=5] node[el, below, pos=0.15] {Antibodies} (virus)
(bodies) edge [bend right=10] node [el, above] {Counted} (data)
(data) edge [bend right=10] node[el,above] {Basis for} (simulations)
(simulations) edge [bend right=10] node[el, below] {Produce more\\Look like} (data)
(simulations) edge [bend right=10] node[el, below] {Represented as} (curves)
(data) edge [bend left=10] node[el, below, pos=0.2] {Represented as} (curves)
(policy) edge [bend left=10] node[el, below, pos=0.2] {Assessed with} (simulations)
(simulations) edge [bend left=10] node[el, above, pos=0.3] {Basis for} (policy)
(policy) edge [bend right=10] node[el, below] {Constrain} (bodies)
(policy) edge [bend right=10] node[el, below] {What gets counted} (data)
(curves) edge [bend right=10] node[el, below] {Legitimise} (policy)
(curves) edge [bend left=10] node[el, below] {Produce as shape\\e.g. waves, peaks, etc} (virus)
(simulations) edge [] node [el] {} (futures1)
(simulations) edge [] node [el] {} (futures2)
(simulations) edge [] node [el] {} (futures3);
\end{tikzpicture}
\vspace{3\baselineskip}
Inspired by:\\
Dinno, Alexis. 2007. `Loop Analysis of Causal Feedback in Epidemiology: An Illustration Relating to Urban Neighborhoods and Resident Depressive Experiences`. \emph{Social Science \& Medicine} 65 (10): 2043–57. https://doi.org/10.1016/j.socscimed.2007.06.018.
\end{document}