Table 1.

Seasonal abundance and natural filarial infections of female black flies collected at Ban Lek, Fang district, Chiang Mai province, northern Thailand, from March 2018 to January 2019.

Season	Month	Simulium Species	No. Collected		No. Infected	No. L3	% Infected
Hot	March	S. chumpornense	317	477	0	0	0
		S. asakoae species-group	111		0	0	0
		S. nigrogilvum	36		1	1	2.78
		S. striatum species-group	13		0	0	0
	May	S. nigrogilvum	151	153	2	3	1.32
		S. chamlongi	1		0	0	0
		S. doipuiense complex	1		0	0	0
Rainy	August	S. nigrogilvum	34	48	0	0	0
		S. asakoae species-group	13		0	0	0
		S. striatum species-group	1		0	0	0
	October	S. nigrogilvum	48	65	1	2	2.08
		S. asakoae species-group	14		0	0	0
		S. manooni	1		0	0	0
		S. doipuiense complex	1		0	0	0
		S. striatum species-group	1		0	0	0
Dry-cool	December	S. nigrogilvum	40	59	0	0	0
		S. doipuiense complex	10		0	0	0
		S. asakoae species-group	7		0	0	0
		S. chamlongi	1		0	0	0
		S. striatum species-group	1		0	0	0
	January	S. asakoae species-group	3	3	0	0	0
		Total	805		4	6	-

Abbreviation: L₃ = third-stage larva (infective larva).