10/08/2015 11:56 EDT | Updated 10/08/2016 01:12 EDT

UN health agency worried polio vaccines in Ukraine might not be used after concerns are raised

LONDON — The World Health Organization says it's worried that millions of doses of polio vaccine might be wasted in the Ukraine after concerns were raised by a patient group that the doses are unsafe.

The oral polio vaccine must be kept frozen while being stored, according to WHO guidelines.

The all-Ukrainian Council for Patients' Rights and Safety says the vaccines partially thawed out on the plane to Ukraine and now shouldn't be used — a proposition being considered this week by the Ukrainian government.

WHO's European director Zsuzsanna Jakab said the vaccine is "absolutely safe" and that it's crucial a planned vaccination campaign start next week to protect Ukrainian children from the paralyzing disease.

Polio was identified in the Ukraine last month, the first time in nine years.

The Associated Press