Captain Dr. Suracha Leelayutthakarn (2021, March), Knowledge of the disease ready            to answer questions about 3 levels of protection : Cheewajit. 23 (539) : 34-35

        First of all, let's understand that. In fact, prevention in medicine is divided into 3 levels: primary, secondary, and tertiary.

              Primary level, or level 1, is to prevent healthy people from getting sick. For example, COVID-19 starts with healthy people getting infected. He may not show any symptoms. to be unaware of the infection All you can do is prevent by washing your hands, using a spoon, wearing a mask, and keeping distance.

              Secondary level, or level 2, is to prevent people suffering from complications. by using tools or diagnosis Whether it's a blood draw or doing various X-rays so that the patient can know where he is in the path of disease.

              Secondary level, or level 3, is to prevent people with complications from developing disabilities, disabilities, or death. The tool for prevention level 3 is the use of treatments or specialists, such as those with diabetes that require a surgeon to take care of rotting feet, etc.