Purpose of the book. SARS-CoV-2 causes coronavirus disease 2019 (COVID-19), which has killed ~7 million people worldwide. SARS-CoV-2 was initially considered as a respiratory pathology. However, it turned out that SARS-CoV-2 causes Multisystem Inflammatory Syndrome (MIS), which the authors Irina Vasilieva, Maria Vasilieva & Ilie Vasiliev (2023) wrote in the book "Molecular pathological biology of Coronavirus infection SARS-CoV-2" published in the UK [1]. The described as the Multisystem Inflammatory Syndrome in children (MIS-C) [2,3] as well as Multisystem Inflammatory Syndrome in Adults (MIS-A) [4], in the context of the global community [5], of SARS-CoV-2 confirms polysystemic, with multi-inflammation of many other organs, affecting the lungs, heart, liver, pancreas, gastrointestinal tract and others.