Found that nice heap of Icons that are free to use and high-quality:

Health Icons is a volunteer effort to create a ‘global good’ for health projects all over the world. These icons are available in the public domain for use in any type of project.

The project is hosted by the public health not-for-profit Resolve to Save Lives as an expression of our committment to offer the icons for free, forever.

https://healthicons.org/about