Table 3.

Number of surveillance system components by region and type of surveillance

Region	Africa	Asia	Europe	America	Oceania	Globally
Surveillance type
Active: representative	3	55	28	9	2	97 (16·5%)
Active: risk based	13	73	45	14	7	152 (25·9%)
Passive	40	72	80	22	13	227 (38·7%)
Outbreak investigation	9	12	6	4	5	36 (6·1%)
Sentinel	3	2	3			8 (1·4%)
Slaughterhouse		4		4	1	9 (1·5%)
Other	13	8		6		27 (4·6%)
Unknown	4	2	25			31 (5·3%)
Grand total by region	85 (14·5%)	228 (38·8%)	187 (31·9%)	59 (10·1%)	28 (4·8%)	587 (100%)