Table 5. Populations of areas with endemic CHIKV and ZIKV transmission by WHO region.

Arbovirus	Number of affected territories and countries	WHO regions (populations of affected countries in thousands)	Total populations of affected countries (% global population)
CHIKV	114	AFRO (828,100) AMRO (929,765) EMRO (257,300) EURO (126,800) SEARO (1,898,600) WPRO (1,658,460)	5,699,025,000 (77.9%)
ZIKV	86	AFRO (445,600) AMRO (929,802) EMRO (0) EURO (64,300) SEARO (1,847,700) WPRO (263,880)	3,551,282,000 (48.6%)

AFRO, African region; AMRO, Americas region; CHIKV, chikungunya virus; EMRO, Eastern Mediterranean region; EURO, European region; SEARO, Southeast Asia region; WPRO, Western Pacific region; ZIKV, Zika virus.

The populations listed were quantified according to the 2015 estimates given in the United States Census Bureau’s International Database (https://www.census.gov/data-tools/demo/idb/).