According to Peter Sandiford of the Liverpool School of Tropical Medicine, no one knows for certain.
据利物浦热带医学院的彼得·桑迪福德说，没有人确切地知道。
A third team is Liverpool School of Tropical Medicine scientists who study how infection occurs, the analog system to carry out the body's own pneumococcal.
第三支团队是利物浦热带医学学院的科学家，他们研究如何在不发生感染的情况下，模拟出人体自身系统携带肺炎球菌。
A third team is Liverpool School of Tropical Medicine scientists who study how infection occurs, the analog system to carry out the body's own pneumococcal.
第三支团队是利物浦热带医学学院的科学家，他们研究如何在不发生感染的情况下，模拟出人体自身系统携带肺炎球菌。
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