Potential Role of Birds in Japanese Encephalitis Virus Zoonotic Transmission and Genotype Shift
文献类型: 外文期刊
作者: Muddassar Hameed;Abdul Wahaab;Mohsin Nawaz;Sawar Khan;Jawad Nazir;Ke Liu;Jianchao Wei;Zhiyong Ma
作者机构:
关键词: birds; genotype shift; Japanese encephalitis virus; JEV genotype I; JEV genotype III
期刊名称: Viruses-Basel
ISSN: 1999-4915
年卷期: 2021 年 13 卷 3 期
页码:
收录情况: JCR(2021版)
摘要: Japanese encephalitis (JE) is a vaccine-preventable disease caused by the Japanese encephalitis virus (JEV), which is primarily prevalent in Asia. JEV is a Flavivirus, classified into a single serotype with five genetically distinct genotypes (I, II, III, IV, and V). JEV genotype III (GIII) had been the most dominant strain and caused numerous outbreaks in the JEV endemic countries until 1990. However, recent data shows the emergence of JEV genotype I (GI) as a dominant genotype and it is gradually displacing GIII. The exact mechanism of this genotype displacement is still unclear. The virus can replicate in mosquito vectors and vertebrate hosts to maintain its zoonotic life cycle; pigs and aquatic wading birds act as an amplifying/reservoir hosts, and the humans and equines are dead-end hosts. The important role of pigs as an amplifying host for the JEV is well known. However, the influence of other domestic animals, especially birds, that live in high abundance and close proximity to the human is not well studied. Here, we strive to briefly highlight the role of birds in the JEV zoonotic transmission, discovery of birds as a natural reservoirs and amplifying host for JEV, species of birds susceptible to the JEV infection, and the proposed effect of JEV on the poultry industry in the future, a perspective that has been neglected for a long time. We also discuss the recent in vitro and in vivo studies that show that the newly emerged GI viruses replicated more efficiently in bird-derived cells and ducklings/chicks than GIII, and an important role of birds in the JEV genotype shift from GIII to GI.
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