One, stay with grandpa and risk selling your health. Statistics show that a tuberculosis patient with positive sputum smear can infect 20 people a year. Since your grandfather is "infectious tuberculosis", he must be a sputum smear positive patient, that is, tuberculosis can be found in sputum, which is different from tuberculosis patients who can't find tuberculosis in sputum, and it is contagious. So "infectious tuberculosis" should be called open tuberculosis. It is worth noting that as many as 50% people in China are infected with tuberculosis, but after all, the incidence rate is very low, which shows that people have strong immunity to mycobacterium tuberculosis. As mentioned earlier, "a tuberculosis patient with positive sputum smear can infect 20 people a year" means that these people are infected with tuberculosis, which does not mean that all 20 people will get sick and are called tuberculosis patients. But long-term exposure will greatly increase the risk of infection and illness.
The second option is to leave him. I know that some old people are stubborn and can't speak at all, and they have also contracted many bad habits before, such as spitting. Since he won't listen to advice, don't worry so much. Saving yourself is the first priority! Aside from ethical principles, because your grandfather is older and you are younger, you can create more value for society. It is wrong to give up great value for small value. I'm not here to teach you not to respect the elderly, but to proceed from reality. Although the treatment of tuberculosis is free now, it is only the basic medicine, and the liver-protecting medicine and nutritional medicine have to pay for themselves. My classmate tossed about 10,000 yuan just for taking the liver-protecting medicine (what my roommate said to get the grant may not be true, but he did get it and took the medicine for a year ...). Do you have the strength at home? Is it worth giving up your family's health for grandpa?
It's not that complicated. Simple "burning phlegm method" can basically solve the problem of tuberculosis infection. Sputum on paper, a fire, the simplest and most practical method. But if he doesn't listen, there's nothing you can do.
Inoculation with BCG has no effect. Bcg vaccine was once concerned, but now it is no longer planted in China, that is, the second injection is not given, because it is found that this vaccine has little preventive effect on adult tuberculosis, and only has a certain effect on children's disseminated tuberculosis. Some European countries have given up popularizing BCG vaccination, because the incidence itself is not large, and vaccination is not worth the candle.
So, although cruel, you basically have no other choice except the above two. This is different from my last answer. I pay more attention to preserving myself. But this is good. There are different options.
2. As I said, the basic drugs for tuberculosis are provided by the state and don't cost a penny, but you have to pay for the liver-protecting drugs and nutritional drugs yourself. Take medicine for at least 6 months, and pay attention to rest during these 6 months. Can parents still hoe the ground?
As for fear, that's a matter of opinion. If you are an atheist, you need not be afraid at all. If you can't, just find a forensic book and look at those dead people. If you read too much, you will certainly develop courage. Personal advice, it feels good ... if you believe in ghosts and gods, it's nothing, as you said, nothing to be afraid of unless you do something wrong.
3. Don't go back. Filial piety cannot be at the expense of oneself. You can do something else to make up for it. For example, you can help your parents more and tell them the harm of tuberculosis. Since the old people don't listen, it's better to let them go as little as possible. Because if your grandfather takes anti-tuberculosis drugs all the year round but doesn't get better, then drug-resistant bacteria are probably already produced in his body, which is a difficult problem in tuberculosis treatment. This drug-resistant bacteria is not sensitive to anti-tuberculosis drugs and it is quite difficult to cure. If he vomits, sputum is a "super tuberculosis" that these drugs can't suppress. If he doesn't change the habit of spitting, then make up his mind not to go!