<s>[INST] Hi, my son has a primary complex. He is 6 years and 17 kls in weight.He is under medication and is taking Rifampicin and Isoniazid for 5 months now. My mother in laws xray result showed that she has PTB in both lungs. I want to know if my son will get infected again. My mother in law is not taking any medication. She does not live with us but visits us twice a week. [/INST] Thanks for your question on Chat Doctor. I can understand your concern. Tuberculosis is an infectious disease. It is spread by Chat Doctor.  Since your mother-in-law is having active tuberculosis, not taking treatment, and she is visiting your home twice-weekly, so your son is exposed two her and this can cause recurrence of TB in your son. So better to consult give your mother-in-law face mask for wearing when she comes to your home. Also give face mask two your son when she is around him. Besides start anti TB  </s>