Article: Cross infection (Intromissia cruciatae) is a group of diseases transmitted through medical instruments. These infections affect patients who are undergoing treatment or are hospitalized, but can also spread among nursing staff and other hospital workers. Typically, the term cross-infection refers to bacterial infections such as Staphylococcus aureus, Escherichia coli, and Pseudomonas aeruginosa, which are transmitted through blood, wound fluids, and other body secretions. However, in recent years, cases of infection with coronavirus infection SARS-CoV-2, which is transmitted through contaminated surfaces and instruments used in medical institutions, have been identified. Examples of infectious cross-infections are hospital acquired infections (HIC), hospital acquired infections (HAIs), and medical infections (MIs). Cross-transmission infections are more common in surgical and trauma departments of hospitals where major medical procedures are performed.