The campaign, which was mainly carried out to prevent the spread of polio from neighbouring Democratic Republic of Congo (DRC), took place in the administrative departments of Brazzaville, Pool in the south, Plateaux and Cuvette in the central region and Likouala in the north.
Congo's director-general of health, Damase Bozongo, said the June vaccination campaign was prompted by reports of new cases of wild poliomyelitis (polio) in the DRC in 2006.
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