There are many reasons for contracting a disease, and it is also possible to contract a disease without going outside. Common causes include exposure to pathogenic microorganisms in the environment and contact with people or animals that carry pathogenic microorganisms.
1. Exposure to pathogenic microorganisms in the environment: There are many pathogenic microorganisms in our daily life that are invisible to the naked eye, and they may be infected after contact, thus causing related diseases. For example, if an air conditioner has not been cleaned and sterilized for a long time, bacteria may grow inside and cause bacterial infections when the air conditioner is turned on and used.
2. Contact with people or animals carrying pathogenic microorganisms: some people or animals infected with diseases contain pathogenic microorganisms in their bodies, and close contact with them may result in human-to-human transmission or animal-to-human transmission, which may result in infection. If you are in the same room with a person who is asymptomatically infected with C.pneumoniae, you may be infected.
3. In addition, some pathogenic microorganisms may be present in the body, such as pneumococcus that colonizes the nasopharynx. They do not cause disease under normal circumstances and may cause disease when immunity is low.
Tip: “New coronavirus pneumonia” and “new coronavirus pneumonia” mentioned in this article were renamed to “new coronavirus infection” on December 26, 2022, as announced by the National Health Commission.