Opposition parties and pressure groups have lambasted suggestions from Labour MP Mary Creagh that parents should be forced to inoculate their children.
Ms Creagh wrote in the Fabian Society magazine that pupils who had not had the controversial MMR vaccine should be prevented from starting school.
But Stuart Jeffery, Green party health spokesman, described the proposal as "shocking" and "inherently discriminatory".
He continued: "A child's access to education is a fundamental human right, and one that must not be based on any external conditions, such as medical intervention. This proposal would effectively be holding a child's future to ransom.
"Forcing parents to have their children inoculated through fines and conditional terms is discriminatory and an infringement of human rights."