house-to-house vaccination campaign, in Yemen's capital Sanaa. 家家戶戶的疫苗接種活動

A girl receives polio vaccination drops during a house-to-house vaccination campaign in Yemen's capital Sanaa, April 12, 2016. (Photo by Khaled Abdullah/Reuters)
The Day in Photos – April 13, 2016
http://avax.news/fact/The_Day_in_Photos_April_13_2016.html