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10.3390/v13060961

http://scihub22266oqcxt.onion/10.3390/v13060961
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34067349!8224680!34067349
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suck abstract from ncbi


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pmid34067349      Viruses 2021 ; 13 (6): ä
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  • Repeated Exposure to Subinfectious Doses of SARS-CoV-2 May Promote T Cell Immunity and Protection against Severe COVID-19 #MMPMID34067349
  • De Angelis ML; Francescangeli F; Rossi R; Giuliani A; De Maria R; Zeuner A
  • Viruses 2021[May]; 13 (6): ä PMID34067349show ga
  • Europe is experiencing a third wave of COVID-19 due to the spread of highly transmissible SARS-CoV-2 variants. A number of positive and negative factors constantly shape the rates of COVID-19 infections, hospitalization, and mortality. Among these factors, the rise in increasingly transmissible variants on one side and the effect of vaccinations on the other side create a picture deeply different from that of the first pandemic wave. Starting from the observation that in several European countries the number of COVID-19 infections in the second and third pandemic wave increased without a proportional rise in disease severity and mortality, we hypothesize the existence of an additional factor influencing SARS-CoV-2 dynamics. This factor consists of an immune defence against severe COVID-19, provided by SARS-CoV-2-specific T cells progressively developing upon natural exposure to low virus doses present in populated environments. As suggested by recent studies, low-dose viral particles entering the respiratory and intestinal tracts may be able to induce T cell memory in the absence of inflammation, potentially resulting in different degrees of immunization. In this scenario, non-pharmaceutical interventions would play a double role, one in the short term by reducing the detrimental spreading of SARS-CoV-2 particles, and one in the long term by allowing the development of a widespread (although heterogeneous and uncontrollable) form of immune protection.
  • |COVID-19/*immunology/prevention & control[MESH]
  • |Dose-Response Relationship, Immunologic[MESH]
  • |Environmental Exposure[MESH]
  • |Humans[MESH]
  • |Immunologic Memory[MESH]
  • |SARS-CoV-2/*immunology[MESH]


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