A worker of an anti-polio drive shouts slogans during a protest rally organized by the Vaccinators Welfare Association against the killing of her colleagues in Karachi

 
A worker of an anti-polio drive shouts slogans during a protest rally organized by the Vaccinators Welfare Association against the killing of her colleagues in Karachi
A worker of an anti-polio drive shouts slogans during a protest rally organized by the Vaccinators Welfare Association against the killing of her colleagues in Karachi December 19, 2012. REUTERS/Akhtar Soomro