Sierra Leone benefited from a yellow fever preventive mass vaccination campaign in 2009, which covered 11 out of 13 districts in the country, excluding Bonthe and Bombali districts.
塞拉利昂曾从2009年开展的一项黄热病预防性群体免疫活动中受益，这项活动覆盖了该国13个区中的11个，但不包括Bonthe区和Bombali区。
Sierra Leone benefited from a yellow fever preventive mass vaccination campaign in 2009, which covered 11 out of 13 districts in the country, excluding Bonthe and Bombali districts.
塞拉利昂曾从2009年开展的一项黄热病预防性群体免疫活动中受益，这项活动覆盖了该国13个区中的11个，但不包括Bonthe区和Bombali区。
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