| <P><SPAN style="COLOR: black; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial">《自然》（</SPAN><SPAN lang=EN-US style="COLOR: black; FONT-FAMILY: Arial">Nature</SPAN><SPAN style="COLOR: black; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial">）近日的一篇文章中，专家们发出警告：一种古老的流感病毒</SPAN><SPAN lang=EN-US style="COLOR: black; FONT-FAMILY: Arial">H2N2</SPAN><SPAN style="COLOR: black; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial">，仍旧在禽类和猪类中传播，其很容易重新出现，从而造成公众健康威胁。因此，从现在起就要对这种病毒进行免疫预防。</SPAN><SPAN lang=EN-US style="COLOR: black; FONT-FAMILY: Arial"><?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /><o:p></o:p></SPAN></P>
<P><SPAN style="COLOR: black; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial">同</SPAN><SPAN lang=EN-US style="COLOR: black; FONT-FAMILY: Arial">1918</SPAN><SPAN style="COLOR: black; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial">年的</SPAN><SPAN lang=EN-US style="COLOR: black; FONT-FAMILY: Arial">H1N1</SPAN><SPAN style="COLOR: black; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial">西班牙流感病毒大流行类似，</SPAN><SPAN lang=EN-US style="COLOR: black; FONT-FAMILY: Arial">H2N2</SPAN><SPAN style="COLOR: black; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial">流感病毒曾在全球范围内预计造成了</SPAN><SPAN lang=EN-US style="COLOR: black; FONT-FAMILY: Arial">100-400</SPAN><SPAN style="COLOR: black; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial">万人的死亡（从</SPAN><SPAN lang=EN-US style="COLOR: black; FONT-FAMILY: Arial">1957</SPAN><SPAN style="COLOR: black; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial">年到</SPAN><SPAN lang=EN-US style="COLOR: black; FONT-FAMILY: Arial">1968</SPAN><SPAN style="COLOR: black; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial">年）。</SPAN><SPAN lang=EN-US style="COLOR: black; FONT-FAMILY: Arial"><o:p></o:p></SPAN></P>
<P><SPAN lang=EN-US style="COLOR: black; FONT-FAMILY: Arial">Gary J Nabel</SPAN><SPAN style="COLOR: black; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial">及同事对该</SPAN><SPAN lang=EN-US style="COLOR: black; FONT-FAMILY: Arial">90</SPAN><SPAN style="COLOR: black; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial">例队列人群的血液进行了</SPAN><SPAN lang=EN-US style="COLOR: black; FONT-FAMILY: Arial">H2N2</SPAN><SPAN style="COLOR: black; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial">抗体的检测，尽管样本量很小，但该研究显示，</SPAN><SPAN lang=EN-US style="COLOR: black; FONT-FAMILY: Arial">50</SPAN><SPAN style="COLOR: black; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial">岁以下人群对</SPAN><SPAN lang=EN-US style="COLOR: black; FONT-FAMILY: Arial">H2N2</SPAN><SPAN style="COLOR: black; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial">的抵抗水平很低，甚至没有免疫力，而</SPAN><SPAN lang=EN-US style="COLOR: black; FONT-FAMILY: Arial">50</SPAN><SPAN style="COLOR: black; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial">岁以上人群对该病毒的抵抗则明显较高。</SPAN><SPAN lang=EN-US style="COLOR: black; FONT-FAMILY: Arial"><o:p></o:p></SPAN></P>
<P><SPAN style="COLOR: black; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial">考虑到</SPAN><SPAN lang=EN-US style="COLOR: black; FONT-FAMILY: Arial">H2N2</SPAN><SPAN style="COLOR: black; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial">病毒的低变异率，以及人类对该疾病免疫力的下降，研究者认为，</SPAN><SPAN lang=EN-US style="COLOR: black; FONT-FAMILY: Arial">H2N2</SPAN><SPAN style="COLOR: black; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial">大流行的可能性是存在的。这促使研究者呼吁人们提前采取免疫措施。</SPAN><SPAN lang=EN-US style="COLOR: black; FONT-FAMILY: Arial"><o:p></o:p></SPAN></P>
<P><SPAN lang=EN-US style="COLOR: black; FONT-FAMILY: Arial">Nabel</SPAN><SPAN style="COLOR: black; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial">认为，采用现有的知识和技术，</SPAN><SPAN lang=EN-US style="COLOR: black; FONT-FAMILY: Arial">H2N2</SPAN><SPAN style="COLOR: black; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial">疫苗的有效性可以获得明显的改善，而且未来其成本将会降低。但是首先应当对这种疫苗的安全性和有效性进行临床检测。</SPAN><SPAN lang=EN-US style="COLOR: black; FONT-FAMILY: Arial"><o:p></o:p></SPAN></P>
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