I am in serious need of finding this image in high resolution with low kb’s. This one looks bad… gif, tiff jpg will work.
Have you tried the actual world diabetes’ day website? http://www.worlddiabetesday.org/materials/the-logo They have the logo in a zip file. Without knowing the size you need exactly, it’s hard to say where to find exactly what you’re looking for. Also, I could be wrong, but if you want high resolution then the file size is going to be fairly large. But, again I don’t know what numbers you’re looking to get. 
Good luck! Hope the link helps!