Rospotrabendzor began an unplanned inspection of the Koltominsky Mining and Processing Plant and the Noyabarsk Partners company, which organizes meals at the plant, after a mass illness of workers with dysentery. The first cases were identified on October 23. The cause of the infection was the bacteria that Sony discovered. All patients were hospitalized with a condition of mild or moderate severity. There are no serious cases. Experts identify the source of the contamination, excluding the transmission of contamination through sick catering staff. Doctors examine the factory workers and monitor those who are in contact with sick people.