Table 4.

Summary of antibody isotype positivity cutoff titer in selected studies

Country	IgG positivity cutoff titer								Studies (n)	References
	≥ 1:40	1:64	≥ 1:64	≥ 1:80	≥ 1:128	> 1:128	≥ 1:960	> 1:960
Brazil		1							1	45
China	1								1	77
Cyprus							1		1	78
France						1			1	40
Germany			1						1	79
Greece			1				1	1	3	48,80,81
Nepal								1	1	82
New Zealand					1				1	39
Spain	1			2	1				4	14,37,58,61
Sri Lanka					1				1	83
Tunisia					1	1			2	19,69
United States		1	2		1				4	84,70,71,85
Total (n)	2	2	4	2	5	2	2	2	21

Country	IgM positivity cutoff titer								Studies (n)	References
	≥ 1:32	≥ 1:40	≥ 1:64	> 1:64	≥ 1:80	> 1:80	≥ 1:400	> 1:400
Brazil				1					1	45
China		1							1	79
Colombia			1						1	88
Cyprus							1		1	78
France				1					1	40
Greece			1				1	2	4	48,80,81,87
Indonesia			1						1	88
Israel		1							1	28
Lao PDR				1			1		2	50,75
Nepal							1		1	16
Spain			1						1	56
Sri Lanka			1						1	83
Taiwan					5	1			6	63,89,90,91,92,93
Tanzania			1						1	65
Tunisia	3		1						4	19,68,67,69
United States			1						1	94
Zambia	1								1	73
Total (n)	4	2	8	3	5	1	4	2	29

Country	Whole antibody positivity cutoff titer								Studies (n)	References
	≥ 1:32	≥ 1:50	> 1:50	≥ 1:64	≥ 1:100	≥ 1:200	≥ 1:400	≥ 1:800
Israel					1				1	74
Lao PDR							1		1	76
Malaysia		1							1	53
Tanzania			1						1	66
Thailand						1		1	2	95
Tunisia	1								1	67
Zambia				1					1	73
Total (n)	1	1	1	1	1	1	1	1	8

* If the positivity cutoff titer was only seen once, then it was not included on the table.

† Studies performed on travelers were excluded.