There may be many mites in the old books in the library, especially in the old files. This is because mites are very small and difficult to detect with the naked eye. At the same time, old books are easy to breed various microorganisms, including mites, fungi, dust and so on, because they are kept for a long time.

If old books are not sanitized, people who come into contact with these books may suffer from skin diseases, especially those with allergies.

Therefore, the library should strengthen the treatment and disinfection of old books to reduce their potential harm to human health.