Petersburg scientists said that with coronavirus, various complications may appear. For example, scientists have already faced superinfection. As reported by Ufanotes.ru with reference to ToDay News Ufa, Professor Alexey Yakovlev commented: “Secondary infection is a fairly broad concept. It can manifest itself during surgical interventions or therapeutic manipulations. Along with a viral infection, a bacterial infection may appear. Therefore, pathogenetic therapy reduces the immune defense, and also saves a person's life, making him vulnerable to bacterial infections. " Yakovlev is convinced that the secondary infection manifests itself during the incubation period. It is also important to take into account the chronic diseases that are exacerbated by the coronavirus. The expert said: “Doctors are using hormones, monoclonal bodies that affect immune defenses, so that a person becomes very vulnerable to infection. In addition, resistance occurs due to antimicrobial therapy. Therefore, it is very difficult to treat a secondary infection."