Nascimento J P, Krawczuk M M, Marcopito L F, Baruzzi R G
J Hyg (Lond). 1985 Aug;95(1):159-64. doi: 10.1017/s0022172400062392.
Influenza A antibodies in serum samples obtained in 1980 from two Indian populations in Central Brazil were compared. The Kren-Akorore, who were first contacted in 1973 and two years later transferred to the Xingu Indian Park (PIX), were compared with Indians from other tribes already living in the PIX before 1975. An analysis was made of the prevalence and distribution of antibodies against the influenza A viruses which have circulated in the civilized world since 1918. Antibodies to the early influenza A viruses were absent in both Indian populations, but A/Hong Kong/1/68 (H3N2) virus apparently circulated in the PIX. No antibody to influenza A/Bangkok/1/79 or to A/Brazil/11/78 (H1N1) was found in any of the sera, whereas antibodies to these viruses were commonly found in urban populations in Brazil. The evidence from influenza antibodies agrees with the information that the Kren-Akorore Indians had been living in complete isolation until 1973, when they were first contacted.
对1980年从巴西中部两个印第安人群体采集的血清样本中的甲型流感抗体进行了比较。将1973年首次接触且两年后转移至欣古印第安人公园（PIX）的克伦-阿科罗雷人与1975年之前就已生活在PIX的其他部落的印第安人进行了比较。对自1918年以来在文明世界传播的甲型流感病毒抗体的流行情况和分布进行了分析。两个印第安人群体均未检测到针对早期甲型流感病毒的抗体，但A/香港/1/68（H3N2）病毒显然在PIX中传播。在任何一份血清中均未发现针对甲型流感/曼谷/1/79或A/巴西/11/78（H1N1）的抗体，而在巴西城市人群中通常能发现针对这些病毒的抗体。来自流感抗体的证据与以下信息相符：克伦-阿科罗雷印第安人在1973年首次接触之前一直处于完全隔离状态。
