Confirmation of Choclo virus as the cause of hantavirus cardiopulmonary syndrome and high serum antibody prevalence in Panama.

Confirmation of Choclo virus as the cause of hantavirus cardiopulmonary syndrome and high serum antibody prevalence in Panama.
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DOI:
10.1002/jmv.21864
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发表时间:
2010-09
影响因子:
12.7
通讯作者:
Koster, Frederick
Koster, Frederick
中科院分区:
医学3区
文献类型:
--
作者:
Nelson, Randin;Canate, Raul;Pascale, Juan Miguel;Dragoo, Jerry W.;Armien, Bias;Armien, Anibal G.;Koster, Frederick

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1999 年至 2000 年巴拿马西部爆发汉坦病毒心肺综合征 (HCPS) 期间,在乙齿鼠、Oligoryzomys fulvescens 和人类中发现了 Choclo 病毒 (CHOV)。尽管 HCPS 很少见,但普通人群中汉坦病毒特异性血清抗体的流行率很高,表明 CHOV 可能导致许多轻度或无症状感染。本研究的目的是确认 CHOV 在 HCPS 和经常检测到的血清抗体中的作用,并建立与其他新世界汉坦病毒的系统发育关系。培养 CHOV 是为了促进小 (S) 和中 (M) 片段的测序,并进行 CHOV 特异性血清中和抗体测定。 S和M片段的序列发现与美洲其他寡鼠传播的汉坦病毒有密切关系,末端核苷酸高度保守,并且没有重组事件的证据。完整 M 片段核苷酸序列的最大似然分析和最大简约分析表明与南美进化枝底部发现的马波拉病毒和内格拉病毒有密切关系。在焦点中和试验中,来自 6 名巴拿马 HCPS 患者的急性和恢复期血清以 1:200 至 1:6400 的稀释度中和了 CHOV。在没有 HCPS 病史的抗体阳性成人样本中,10 份血清中的 9 份在 1:100 至 1:6400 稀释度范围内中和了 CHOV。尽管与尚未与人类疾病相关的其他同域汉坦病毒交叉中和是可能的,但 CHOV 似乎是巴拿马大多数轻度或无症状汉坦病毒感染以及 HCPS 的病原体。
Choclo virus (CHOV) was described in sigmodontine rodents, Oligoryzomys fulvescens, and humans during an outbreak of hantavirus cardiopulmonary syndrome (HCPS) in 1999 to 2000 in western Panama. Although HCPS is rare, hantavirus-specific serum antibody prevalence among the general population is high suggesting that CHOV may cause many mild or asymptomatic infections. The goals of this study were to confirm the role of CHOV in HCPS and in the frequently detected serum antibody and to established the phylogenetic relationship with other New World hantaviruses. CHOV was cultured to facilitate the sequencing of the small (S) and medium (M) segments and to perform CHOV-specific serum neutralization antibody assays. Sequences of the S and M segments found a close relationship to other Oligoryzomys-borne hantaviruses in the Americas, highly conserved terminal nucleotides, and no evidence for recombination events. The maximum likelihood and maximum parsimony analyses of complete M segment nucleotide sequences indicate a close relationship to Maporal and Laguna Negra viruses, found at the base of the South American clade. In a focus neutralization assay acute and convalescent sera from 6 Panamanian HCPS patients neutralized CHOV in dilutions from 1:200 to 1:6400. In a sample of antibody-positive adults without a history of HCPS, 9 of 10 sera neutralized CHOV in dilutions ranging from 1:100 to 1:6400. Although cross-neutralization with other sympatric hantaviruses not yet associated with human disease is possible, CHOV appears to be the causal agent for most of the mild or asymptomatic hantavirus infections, as well as HCPS, in Panama.
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