Tuberculosis -Important communicable disease spread by respiratory route Infection sources: patients wit ith infectious pulmonary TB, esp sputum positive ones a disease of respiratory transmission: droplets Patients with the active disease(bacilli expel them into the air by coughing, sneezing, shouting, or any other way that will expel bacilli into the air Determinants of transmission The probability of contact with a case of tuberculosis the intimacy and duration of that contact the degree of infectiousness of the case the shared environment of the contact; crowding poor ventilated Susceptible population elderly people, children, ICH (HIV, DM.) MBBS project, Zhongshan HospitalMBBS project, Zhongshan Hospital Tuberculosis - Important communicable disease spread by respiratory route • Infection sources: patients with infectious pulmonary TB, esp. sputum positive ones • A disease of respiratory transmission: droplets — Patients with the active disease (bacilli) expel them into the air by coughing, sneezing, shouting,or any other way that will expel bacilli into the air • Determinants of transmission — The probability of contact with a case of tuberculosis — the intimacy and duration of that contact — the degree of infectiousness of the case — the shared environment of the contact: crowding, poor ventilated • Susceptible population — elderly people, children, ICH (HIV, DM…)