BBC News Yemen crisis
During the height of the pandemic in Yemen, there was only one functioning hospital in the city of Aden, home to a million people.
Yemen is already facing the world's worst humaritarian crisis and the coronavirus pandemic has not stopped the fighting.
When six-year-old best friends, Ayaan and Mikaeel found out about the 12.3 million children suffering from the Yemen crisis they wanted to help with their lemonade stand.
Mujahed Aqlan has not seen his family since he fled Yemen aged 15 when gunmen came to his house.
By Caleb Spencer
By Nawal Al-Maghafi
BBC Arabic special correspondent
Yemen's humanitarian crisis is worsening as coronavirus compounds the impact of the conflict.
The BBC gained access to hospitals in Sanaa that are bracing for an outbreak with very few resources.