“The U.N. has halted its participation in a Pakistani-run polio vaccination program following attacks on health care workers. Lack of U.N. support is a big setback, but the government said it would not end the campaign. Officials say the country is committed to seeing polio eradicated and has suspended vaccinations only in Sindh province, where Karachi is located.”
Source:U.N. Drops Out Of Polio Vaccinations In Pakistan Following Shootings : The Two-Way : NPR
