How to write consent letter for vaccination from parents to school?

Question: How to write consent letter for vaccination from parents to school?

To 

The principal 

School name 

Address of school

Sub :- consent for vaccination.

   Respective sir /madam , being a parent of children I would like to request you for organizing the vaccination camp for the children of age ( 14 -18 year ) in the school.

Your greatfully

      XYZ.