Since childhood, many remember the Mantoux test. With this test, you can detect a tuberculosis infection. There is a fairly widespread belief that Mantoux should not be wetted.
The Mantoux test is carried out by intradermal injection of an allergen - Tuberculin. This study is carried out in children vaccinated with BCG from 12 months. The reaction is checked after three days by measuring the size of the papule on the skin. During this time, water can be allowed to enter, however, in some cases, the reaction may intensify. In this case, the test can be recognized as positive. Then you will have to take an additional test.
You can wash within 72 hours after the Mantoux test, but with caution. The area of skin at the injection site should not be rubbed with a washcloth. It is not advisable to glue the injection site with a plaster or wrap it with polyethylene, since tightly closed skin will sweat and get wet. In any case, a drop in moisture will not affect the test result.
Before checking the Mantoux reaction, it is not advisable to visit the pool and sauna. Also, the sample site should not be scratched, smeared with iodine or heated.
The misconception that Mantoux should not be soaked is probably due to the experience of the previous generation. Previously, such studies were conducted by an open method. Small scratches were made on the skin, on which a sample was applied on top. With this method, the ingress of water really led to an unpredictable result and doctors prohibited contact with water.
In adulthood, the Mantoux test is not done. Instead, fluorography is regularly performed to detect tuberculosis infection at an early stage.