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二十一世纪第二个十年(2011-2020 年)期间印度的口蹄疫状况。

Foot-and-mouth disease status in India during the second decade of the twenty-first century (2011-2020).

机构信息

ICAR-Directorate of Foot-and-Mouth Disease, International Centre for FMD, Bhubaneswar, Khordha, Odisha, 752050, India.

出版信息

Vet Res Commun. 2022 Dec;46(4):1011-1022. doi: 10.1007/s11259-022-10010-z. Epub 2022 Oct 3.

Abstract

Foot-and-mouth disease (FMD) is a major disease of livestock in India and causes huge economic losses. The formal FMD control program started in 2003-04 in selected districts and was gradually expanded. The present study provides a descriptive review of the FMD outbreaks, prevalent serotypes, and genetic and antigenic features of the FMD virus (FMDV) that circulated in the country between 2011 and 2020. FMD outbreaks were regularly reported in cloven-hoofed domestic livestock and wildlife, with three serotypes including O, A, and Asia1. During the study period, a total of 2226 FMD outbreaks were documented and serotypes confirmed. FMDV serotype O dominated the outbreak scenario, accounting for about 92% of all outbreaks, followed by Asia1 (5% of all outbreaks) and A (3% of all outbreaks). Two major epidemics of FMD on an unprecedented scale during the years 2013 and 2018 by serotype O were recorded. The spatial distribution of FMD was characterized by a larger number of outbreaks in the southern region of the country. In an annual-scale analysis, 2020 was the year with the lowest outbreaks, and 2013 was the year with the highest. The month-scale analysis showed that outbreaks were reported throughout the year, with the highest numbers between October and March. The emergence of three major lineages (O/ME-SA/Ind2001d, O/ME-SA/Ind2001e, and O/ME-SA/Ind2018) of serotype O was observed during the period. In the cases of serotype A and Asia1, the appearance of at least one novel lineage/genetic group, including A/G-18/non-deletion/2019 and Asia1/Group-IX, was documented. While serotype A showed the advent of antigenic variants, serotypes O and Asia1 did not show any antigenic diversity. It was noticed during the course of an outbreak that animal movement contributes significantly to disease transmission. Except for 2018, when numerous FMD outbreaks were recorded, the number of annual outbreaks reported after 2016 has been lower than in the first half of the decade, probably due to mass vaccination and COVID-19 pandemic-linked movement restrictions. Even during outbreaks, disease symptoms in ruminant populations, including cattle, were found to be less severe. Regular six-monthly immunization certainly has a positive impact on the reduction of disease burden and should be followed without fail and delay, along with intensive disease surveillance.

摘要

口蹄疫(FMD)是印度主要的家畜疾病,造成巨大的经济损失。正式的口蹄疫控制计划于 2003-04 年在选定的地区开始,并逐步扩大。本研究对口蹄疫病毒(FMDV)在 2011 年至 2020 年期间在该国流行的爆发、流行血清型以及遗传和抗原特征进行了描述性综述。偶蹄类家畜和野生动物中定期报告口蹄疫爆发,有三种血清型,包括 O、A 和 Asia1。在研究期间,共记录了 2226 起口蹄疫爆发并确认了血清型。FMDV 血清型 O 主导了爆发情况,占所有爆发的 92%左右,其次是 Asia1(占所有爆发的 5%)和 A(占所有爆发的 3%)。2013 年和 2018 年,O 型发生了两次规模空前的重大疫情。口蹄疫的空间分布特点是该国南部地区爆发的数量较多。在年度规模分析中,2020 年是爆发最少的一年,2013 年是爆发最多的一年。月度规模分析显示,全年都有爆发报告,10 月至 3 月报告的爆发数量最多。在此期间观察到 O 型的三个主要谱系(O/ME-SA/Ind2001d、O/ME-SA/Ind2001e 和 O/ME-SA/Ind2018)的出现。在 A 型和 Asia1 型的情况下,记录了至少一个新谱系/遗传群的出现,包括 A/G-18/非缺失/2019 和 Asia1/Group-IX。虽然 A 型显示出抗原变体的出现,但 O 型和 Asia1 型没有显示出任何抗原多样性。在爆发过程中注意到,动物运动对疾病传播有重大贡献。除了 2018 年记录了大量口蹄疫爆发外,2016 年后每年报告的爆发数量低于十年前的上半年,可能是由于大规模疫苗接种和与 COVID-19 大流行相关的运动限制。即使在爆发期间,反刍动物种群(包括牛)的疾病症状也发现不太严重。定期每六个月免疫肯定对口蹄疫负担的减轻有积极影响,应毫不拖延地跟进,并与强化疾病监测相结合。

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