Dictyocaulus filaria and Muellerius capillaris are important lungworm parasites of sheep in Wogera district, northern Ethiopia.

Cross-sectional study was conducted from October 2010 to March 2011 to determine lungworm species and their prevalence in sheep and evaluate the effect of risk factors in Wogera district, northern Ethiopia. Faecal samples were randomly taken from 390 heads of sheep for examination of first stage larvae (L1) of lungworms using a modified Baerman technique. The overall prevalence of lungworm infection was in sheep 67.69% (264 of 390). The lungworm species found were Dictyocaulus filaria (D. filaria) and Muellerius capillaris (M. capillaris) as single and mixed infection. The proportions of infection by D. filaria, M. capillaris and mixed were 55.30, 25.75 and 18.93%, respectively. Sex-wise infection rate was 69.78 and 68.15% in males and females, respectively with no significant difference (p>0.05) among them. The infection rate of D. filaria and M. capillaris infection could not show significant difference (p<0.05) among young (75%), adult (69.78%) and old (63.64%) age groups. Likewise, the infection rate between male and female animals did not show significant difference (p<0.05). This study showed high prevalence of lungworm infection which impairs the productivity of small ruminants, implying the need for control intervention.