Eating together without being tested for tuberculosis carries a high risk of infection if you belong to a patient with open tuberculosis, and a relatively low risk of infection if you are not a patient with open tuberculosis. The transmission of TB is mainly through airborne transmission between patients and healthy people, with the excretion of bacteria from patients with open TB being the main source of TB transmission. Although undetected tuberculosis, if a patient is in the progressive or improving stage of tuberculosis, a healthy person who eats with him or her is at a greater risk of infection due to the occurrence of close, unprotected contact. If an undetected TB patient, who has been infected for a longer period of time, has been in a stable stage, the tuberculosis divergent bacilli in his body may have been in a quiescent state, and there may be less possibility of bacterial excretion, and the risk of infection from eating together is relatively low. After discovering tuberculosis, one should go to the hospital as soon as possible for prompt and correct treatment, and the detection must be treated and the treatment must be thorough. If you suspect that you are infected, you should also go to the hospital as soon as possible for the relevant treatment and have regular medical check-ups.