TB - latent vs disease

Question 1

What would the chest X-ray of a patient with latent TB infection look like? And of a patient with TB disease?

Answer 1

Latent infection - normal

Disease - consolidation, pleural effusion

Question 2

What would the sputum sample of a patient with latent TB infection contain? And of a patient with TB disease?

Answer 2

Latent infection - clear of mycobacterium TB

Disease - positive for mycobacterium TB

Question 3

Is a patient with latent TB infection infectious? And a patient with TB disease?

Answer 3

Latent infection - non infectious

TB disease - infectious