Teachers have helped TES raise enough money to protect almost 275,000 children from the deadly disease tetanus simply by answering an online survey.
Some 274,000 teachers responded to the questionnaire, which found that 43 million teachers and pupils worldwide use TES Connect resources in schools, with about 2 million teachers - roughly equally divided between primary and secondary - using the resources to teach 41 million pupils.
TES donated the cost of one vaccine to children's charity Unicef for each completed survey, a total of more than #163;10,000.
Louise Rogers, chief executive of TSL Education, parent company of TES, said: "We passionately believe in equality of access to the highest-quality teaching resources for every child. The fact that TES Connect now reaches a total of 43 million teachers and students across the world shows the site is having a phenomenal influence on how teachers collaborate, and prepare and deliver their lessons. We're delighted we have been able to help Unicef in its campaign."
The money raised will go towards Unicef's work in providing health and education programmes, which include a campaign to eliminate maternal and neonatal tetanus (MNT). The disease, which killed 58,000 newborns in 2010 alone, is easily preventable through immunisation of women, who pass the protection on to their children for the first few months of their lives.
"On behalf of all the children who will benefit from the donation, I want to say a huge thank you to teachers and TES for their generous gift to Unicef," a spokeswoman for the charity said. "Money raised for Unicef helps us to provide vital medicine, food and water for children to survive and flourish, and education and protection to change children's lives for good."
Already MNT has been eliminated in 29 of the 59 countries where it still existed in 1999 - including Turkey, Egypt and China.