For any stingray, be it a manta ray, a saw, or a stingray, water is its natural habitat. After all, this is a fish, and any fish lives in water. It is impossible to live in water and not be wet.
I can say that you can. They did Mantoux, and once I decided to conduct an experiment - I went to the bathroom, wrapped my hand with cellophane, but then took it off. Of course there was nothing. But getting sick, for example, during the period of revealing a reaction to Mantoux is another matter. So they raked me in for testing at the TB dispensary, although it turned out to be a banal ARVI.
Is it possible to wet the mantu? First, let's figure out what Mantoux is.
This is a skin test. It is a test for tuberculosis - that is, a test, not a vaccination. It is impossible to get vaccinated against TB and even more so to become infected with TB through the Mantoux test. Tuberculosis is known to be a bacillus - that is, a bacterium in the form of a stick. And here are the fragments of these sticks and are used for testing. The body reacts to such a dead bacillus in the same way as to real live tuberculosis, and it is from this reaction that one can judge the presence of TB pathogens in the body. This drug of dead sticks is called tuberculin, and was first used for a test for tuberculosis in the early 20th century. Only then the test was done differently - they smeared the skin with a solution of tuberculin, and then scratched it with a special drill. That is, the test was superficial - tuberculin got into the scratched skin. It was really impossible to wet such a sample for 24 hours so that the tuberculin was not washed out. If he washed, the result was inaccurate. This test is called the Pirquet test, and it was used until the early 70s of the 20th century. That is, your mothers and fathers, and even grandparents, definitely caught her. From here and went it cannot be wet. However, already by the 80s, with the massive appearance of available syringes, Pirquet's test was replaced by the same Mantoux's test. Mantoux is no longer a “cutaneous” test, but a subcutaneous test, and it is performed in a different way. Tuberculin solution is injected under the skin. That is, the drug is driven there under pressure. The water in the bathroom, river or sea does not get under the skin; water in general can be driven under the skin with a syringe. So water does not affect the Mantoux test. However, in the old fashioned way and old memory, they continue to advise not to wet Mantoux for three whole days, so we wrestle in the bathroom, trying to wash with one hand while the other sticks out outside the bathtub and is still covered with a film. This is connected again with the fucking living conditions of Soviet and Russian children. The fact is that these tests are carried out en masse, as a rule, during the school season in winter, when there is a high risk of catching a cold, especially if you go out into a cold apartment steamed. Therefore, not washing while the Mantoux test is in progress is rather a warning, because the result of the test in a sick body is also incomprehensible. But now everyone seems to live in heated houses, so you can wet Mantoux. But just get wet! It is undesirable to rub it with a washcloth and scratch it, because in theory this can affect the result. And what exactly should be the result? At the site of the Mantoux injection, the skin turns red and a button appears. After 3 days, the button usually subsides, and the doctor evaluates the diameter of the remaining redness. The sample is considered Negative: after the injection, there is no redness and induration at all, or the reaction does not exceed 1 mm. This means that tuberculosis bacteria have never entered the body. The reaction can also be negative if you become infected with tuberculosis in people with severely weakened immune systems (for example, people with HIV infection) or if the infection occurred within the last 10 weeks. Doubtful: the seal is notprotrudes 4 mm or only redness occurs. Positive: a seal of 5-16 mm occurs. Such a reaction indicates that the person has immunity against tuberculosis. According to the change in this reaction over several years, the doctor assesses whether a person has been infected with tuberculosis. If the reaction in children exceeds 17 mm (in adults, 21 mm) or pustules and ulcers appear at the injection site, the reaction is called hyperergic. It indicates that a large number of bacteria are clearly entering the body and infection with tuberculosis. In a healthy person, the reaction may be hyperergic if he has recently had an infectious disease or has a tendency to allergic reactions. In addition, a strong difference is a bell - the last test was 5 mm, and this one is already 10. There may have been contact with a TB patient. Just for this - assessments - and you need to regularly do the Mantoux test. Children who were vaccinated against tuberculosis after birth - BCG - are given a Mantoux test once a year, and those who have not been vaccinated - 2 times a year. Everyone with a negative test, at the age of 7, is sent for a second BCG vaccination - but this is already a TB vaccine, not a test. It is not for life, so periodically you need to re-vaccinate. Those who are positive, say more than 15 mm, i.e. the likelihood of infection is high, they are registered in a tuberculosis dispensary, where the child is steamed with regular x-rays of the lungs, which is not particularly useful for a growing organism. However, if the pathogen really exists, then an active reaction to mantu means that, despite the absence of symptoms and other external manifestations, the body has already begun to rebuild itself to fight the disease. TB detected in the early stages can be treated, which is what physiatrists do in TB dispensaries. This is especially funny when Mantoux gives a false result - that is, there is actually no tuberculosis, the body just reacted, say, because the grandfathers fought, after which they spent time in Stalin's camps, where they fell ill with TB. Tuberculosis develops especially rapidly against the background of malnutrition in tightly packed rooms, that is, in prisons and in the zone. And so that this does not happen, and the test is as accurate as possible and not false positive, it is better not to rub the injection site, not to scratch, and not to rub it with a towel. Because it smears the results. Why is this not the most accurate test continue to be done? Well, first of all, Mantoux's accuracy is still quite high, the drug itself is cheap, the procedure is simple - therefore, it allows a large number of people to be tested in large quantities. The incidence of tuberculosis is growing due to the mass release of convicts to freedom - and modern overcrowded prisons, TB is spreading at lightning speed, as well as the influx of migrants from Asia, where during the time of Sovka no one was particularly vaccinated, but now they have been completely killed. If suddenly the test gave a positive result, the Diaskintest test is also carried out - unlike Mantoux, it does not respond to the BCG vaccine. This is a specific test that detects only Mycobacterium TB, i.e. this is an addition to the Mantoux teste its replacement. In addition, there is also a PCR method for diagnosing saliva. But this is already a relatively expensive procedure that requires laboratory conditions, so it is unlikely to become widespread in the foreseeable future, unlike the Mantoux test, for which you need a syringe and a ruler.
YOU CAN. A child who had a Mantoux test can go to the pool, to the river, to the shower on the same day, anywhere, the main thing is not to rub the injection site. The Mantoux test is an intradermal injection of tuberculin. According to the body's reaction to such a substance, tuberculosis can be suspected in a person. Several decades ago, the Pirquet cutaneous test was used for this - the hand was scratched and the same tuberculin was applied. Naturally, it was impossible to wet it, hence the conviction that it was forbidden to wet the Mantoux sample, although in this case the water does not wash anything away. But in general, this test is not very good: there are many false positives. Fortunately, alternative tests now exist.