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Which of these patients should be considered at risk of transmitting TB. Check all that apply:

a. TB patient on treatment for three months under DOT b. A man coming to be checked because his wife has TB and he is coughing c. A teenager with pulmonary TB on treatment for 1 week d. Patient with pneumonia who has returned for sputum results and whose sputum was positive e. Patient with TB meningitis (no other site) f. Patient just diagnosed with sputum smear-negative pulmonary TB g. Unknown patient coming for first visit, coughing for three weeks, has fever, not covering mouth.