Six polio vaccination workers were killed in attacks in Pakistan since Monday . A Taliban commander in northwest Pakistan banned polio vaccines . Pakistan is one of 3 countries where polio remains endemic , WHO says . Score: 6
Six polio vaccination workers were killed in attacks in Pakistan since Monday . A Taliban commander in northwest Pakistan banned polio vaccines . Pakistan is one of 3 countries where polio remains endemic , WHO says . WHO estimates 280,000 children living in the northwest tribal area need of polio vaccine .