“未受保护”
用英语怎么说？

Epidemiologists confirmed that several laboratory-verified cases involve the MenB strain, which remains the leading cause of meningococcal disease across the United Kingdom. Because routine immunisation for this variant was only introduced in 2015, the present demographic of young adults remains largely unprotected. Genomic specialists are currently conducting whole genome sequencing to determine whether a mutant strain with enhanced virulence or transmissibility is driving this acute cluster, while testing the pathogen's susceptibility to existing prophylactic formulations.

流行病学家证实，多起实验室确诊病例涉及B型脑膜炎双球菌菌株，该菌株仍是全英国脑膜炎球菌疾病的主要病因。由于针对该变异株的常规接种直到2015年才普及，当前年轻人群体大多仍未受保护。基因组学专家目前正在进行全基因组测序，以确定是否存在具有更强毒力或传播力的突变毒株推动了这起急性聚集性疫情，并同时测试该病原体对现有预防制剂的敏感性。