Retrieve vertex coordinate after pose change

Hello everyone,

I started working with blender a few days ago, because i need it for a university project. Therefore I importet a makehuman model and change the pose of this model via a python script (i.e. the scale and rotation of three bones).

bpy.context.object.pose.bones[''].rotation_euler[0] = 0

Now I want to get the location of a sample vertex after such transformations. My current approach is transform the object to a mesh with this code

C = bpy.context
render = bpy.context.scene.render
me =['makehumanMesh'].to_mesh(scene=C.scene, apply_modifiers=True, settings='PREVIEW')
wco = me.vertices[idx].co

But this changes the indices of the vertices, so I have no correspondences between the original vertices and the transformed ones.
Probably someone of you can help me!

Thank you!

Note that indices should stay the same as long as there are no active modifiers like array, bevel etc. (all which change the geometry).