Table 4.

Symptomatic JEV infection ratio and case-fatality ratio (CFR) of JEV with clinical illness from various sources. The numbers in brackets are the geometric average of the upper and lower ranges.

$\frac{\text{Symptomatics}}{\text{Total}\text{Infections}}$ (Symptomatic%)	$\text{CFR}=\frac{\text{Mortality}}{\text{Clinical}\text{Illness}}$	Source(s)
(0.48%) 0.4%–0.5%	30%	Centers for Disease Control (2017); World Health Organization (2017)
< 1%	20%–30%	Arai et al. (2008); Centers for Disease Control and Prevention (2017)
(0.81%) 0.33%–2%	25%	Libraty et al. (2002)
(0.63%) 0.1%–4%	25%–30%	Mackenzie et al. (2004); Solomon and Winter (2004)
4% (occasionally)	–	Van den Hurk et al. (2009)
(0.63%) 0.1%-4%	–	Chakraborty et al. (1980); Grossman, Edelman, Chiewanich, Voodhikul, Siriwan, 1973, Grossman, Edelman, Willhight, Pantuwatana, Udomsakdi, 1973; Halstead and Grosz (1962); Konishi and Suzuki (2002)
–	35%	Monath et al. (2000)
–	36.4% (children)	Kumar et al. (1990)