Table 1.

Specimens tested and influenza positivity results in the nine study countries of Asia

Country/Regions	Total samples			Influenza A				Influenza B
	Specimens tested (#)	Influenza positive (#)	Sample Positivity (%)	Positive (#)	Proportion Positive (%)	Epidemic monthsa	Season	Positive (#)	Proportion Positive (%)	Epidemic monthsa	Season
Japanb	NA	76 374		66 373	86·9	December–March	Winter	10 001	13·1	December–April	Winter
North China	547 154	77 824	14·2	55 889	71·8	November–March	Winter	21 935	28·2	December–March	Winter
South China	820 595	141 771	17·3	102 612	72·4	July–September and January–March	Monsoon–Winter	39 159	27·6	December–April	Winter
India	29 319	3471	11·8	2155	62·1	June–August	Monsoon	1313	37·8	August–December	Monsoon–Winter
Lao PDRc	5701	1026	18·0	684	66·7	September–December	Monsoon	342	33·3	July–January	Monsoon–Winter
Thailand	25 826	5276	20·4	3408	64·6	July–November	Monsoon	1868	35·4	August–February	Monsoon–Winter
Cambodia	13 346	2103	15·8	1226	58·3	July–October	Monsoon	877	41·7	September–January	Monsoon–Winter
Philippines	73 629	12 698	17·2	10 635	83·8	July–October	Monsoon	2063	16·2	September–December	Monsoon–Winter
Malaysia	11 285	805	7·1	577	71·7	–		233	28·9	April–May, August–October	Monsoon–Winter
Singapore	59 902	14 750	24·6	12 310	83·5	May–June	Monsoon	2440	16·5	January–February, April–May, November–December	Monsoon–Winter
Totald	1 586 757	259 724	16·4	189 496	73·0	–		70 230	27·0	–

^aDefined as 2 or more consecutive months with monthly proportion of annual positive samples above 8·3%.

^bData from FluNet.

^cData for 2008–2013.

^dExcluding data from Japan.