Table 1.

Characteristics of latent TB infection vs TB disease.

	Latent TB infection	TB disease
Symptoms	None	Hemoptysis, chest pain, unexplained weight loss, night sweats, persistent cough and fever
Physical appearance	Well-looking, feels healthy	Unwell, feels sick
Skin or blood test	Positive result indicating TB infection	Positive result indicating TB infection
TB bacterial infection	Previous infection Cannot spread the disease to others	Recent infection Can spread the disease to others
Chest X-ray	Normal	Abnormal
Sputum smear or culture	Negative	Positive
Treatment	Encouraged to decrease the risk of progression to active disease	Recommended to treat TB disease