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語呂合わせ依頼者より I'm not sure http://xxxxxxxxxx.in.net/ xxx Malaria is caused by a relatively sophisticated single-celled microbe, Plasmodium falciparum, with a complex life-cycle. The parasite can change its outer protein coat to confuse the body's immune defences and so effectively presents a constantly moving target for the vaccine "bullet". by Oswaldoさん

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