Most people are naturally armed against SARS-CoV-2: study

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The majority of the population can produce neutralizing antibodies against severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) in severe cases of coronavirus disease 2019 (COVID-19), according to a study published February 11 in the open-access journal PLOS Pathogens by Michael Mor of Tel Aviv University, and colleagues. Moreover, the results support the use of combination antibody therapy to prevent and treat COVID-19.

The COVID-19 pandemic, caused by SARS-CoV-2, has had a profound impact on global public health. Neutralizing  that specifically target the receptor-binding domain (RBD) of the SARS-CoV-2 spike protein are thought to be essential for controlling the virus. RBD-specific neutralizing antibodies have been detected in convalescent patients—those who have recovered from COVID-19. Some of the recoverees tend to have robust and long-lasting immunity, while others display a waning of their neutralizing antibodies. The factors associated with an effective, durable antibody response are still unclear.

https://medicalxpress.com/news/2021-02-people-naturally-armed-sars-cov-.html