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COVID 19 Special Collection

COVID-19 (SARS-CoV-2) Special Collection

Latest COVID-19 Articles

  • Research Article

    Mutations in the Spike Protein of Middle East Respiratory Syndrome Coronavirus Transmitted in Korea Increase Resistance to Antibody-Mediated Neutralization

    MERS-CoV has pandemic potential, and it is important to identify mutations in viral proteins that might augment viral spread. In the course of a large hospital outbreak of MERS in the Republic of Korea in 2015, the spread of a viral variant that contained mutations in the viral spike protein was observed. These mutations were found to reduce receptor binding and viral infectivity. However, it remained unclear whether they also exerted proviral effects. We demonstrate that these mutations reduce sensitivity to antibody-mediated neutralization and are compatible with robust infection of target cells expressing large amounts of the viral receptor DPP4.

    Continue Reading

    Hannah Kleine-Weber, Mahmoud Tarek Elzayat, Lingshu Wang, Barney S. Graham, Marcel A. Müller, Christian Drosten, Stefan Pöhlmann, Markus Hoffmann

    4 January 2019, JVI

  • Research Article

    Deletion of both the Tyrosine-Based Endocytosis Signal and the Endoplasmic Reticulum Retrieval Signal in the Cytoplasmic Tail of Spike Protein Attenuates Porcine Epidemic Diarrhea Virus in Pigs

    Many coronaviruses (CoVs) possess conserved motifs YxxΦ and/or KxHxx/KKxx in the cytoplasmic tail of the S protein. The KxHxx/KKxx motif has been identified as the ER retrieval signal, but the function of the YxxΦ motif in the intracellular sorting of CoV S proteins remains controversial. In this study, we showed that the YxxΦ of PEDV S protein is an endocytosis signal. Furthermore, using reverse genetics technology, we evaluated its role in PEDV pathogenicity in neonatal piglets. Our results explain one attenuation mechanism of Vero cell-adapted PEDV variants lacking functional YxxΦ and KVHVQ motifs. Knowledge from this study may aid in the design of efficacious live attenuated vaccines against PEDV, as well as other CoVs bearing the same motif in their S protein.

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    Yixuan Hou, Tea Meulia, Xiang Gao, Linda J. Saif, Qiuhong Wang

    4 January 2019, JVI

  • Research Article

    Dynamics of Virus-Specific Memory B Cells and Plasmablasts following Viral Infection of the Central Nervous System

    The prevalence and role of antigen-specific Bmem in the CNS during viral encephalomyelitis is largely undefined. A lack of reliable markers identifying murine Bmem has made it difficult to assess their contribution to local antiviral protection via antigen presentation or conversion to ASC. Using reporter mice infected with neurotropic coronavirus to track virus-specific Bmem and ASC, this report demonstrates that both subsets only emerge in the CNS following peripheral GC formation and subsequently prevail. While early GC reactions supported preferential Bmem accumulation in the CNS, late GC reactions favored ASC accumulation, although Bmem outnumbered ASC in draining lymph nodes throughout infection. Importantly, virus-specific B cells undergoing sustained GC selection were continually recruited to the persistently infected CNS. Elucidating the factors governing temporal events within GCs, as well as regional CNS cues during viral persistence, will aid intervention to modulate CNS humoral responses in the context of infection and associated autoimmune pathologies.

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    Jeffrey R. Atkinson, Mihyun Hwang, Angel Reyes-Rodriguez, Cornelia C. Bergmann

    4 January 2019, JVI

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Podcast from AAC

Vaccines for COVID19: A Critical Appraisal with Dr. Carol Baker. Guest: Dr. Carol Baker. Hosted by AAC Editor in Chief Cesar A. Arias.

Podcast from JCM

Watch COVID-19: Clinical Labs in the Media Spotlight with Dr. Katherine Wu and Dr. Susan Butler-Wu. Hosted by Journal of Clinical Microbiology Editor in Chief, Dr. Alexander McAdam.

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