For general bacterial infections, such as Staphylococcus aureus, Streptococcus pneumoniae, or general bacterial infections in patients due to other enterococci or enterobacteria, such cases are mostly considered to be due to ectopic infections of normal flora caused by pathogenesis after the body’s immunity is too low, and usually do not infect other normal people. However, for specific bacterial infections such as Bacillus anthracis and Mycobacterium tuberculosis, it is possible to infect other people during the infectious period, especially for Mycobacterium tuberculosis. If the patient has tuberculosis and mycobacterium acidophilus can be found in the sputum, the patient is considered to be a tuberculosis patient and is highly infectious. Such patients need to isolate themselves, wear a mask when they go out, wrap their sputum in paper and take it to a designated place, collect and burn their used items and daily necessities, and do proper isolation. In addition, for bacterial infections of intestinal origin such as dysentery bacilli, their feces are also contagious, so it is also necessary to do proper isolation.