Table 2. Empirical ranges of strain diversity of different continents.

${\displaystyle u}$, unique non-shared types per strain. ${\displaystyle D_{var}}$ is the Chao1 index (Chao, 1984) estimated from local sampling.

Continent	${\displaystyle D_{var}}$	${\displaystyle u}$	${\displaystyle nstrain}$	Source
Africa	3712–20,000	50	74.24–400	Chen et al., 2011; Day et al., 2017; Ruybal-Pesántez et al., 2022
Asia	1100–1700	25	44–68	Tonkin-Hill et al., 2018
Oceania	290–1094	20	14.5–54.7	Barry et al., 2007; Tessema et al., 2015
South America	113–351	25	4.52–14.04	Albrecht et al., 2010; Rougeron et al., 2017