K.M.
The three stages of tuberculosis (TB):
1. primary infection within the lung tissue: this is the usual way how tuberculosis starts.
2. latent or dormant stage of tuberculosis: often tuberculosis goes "underground", on the surface not progressing for up to 1 or 2 years, but the TB bacterium is live wherever it incubates and there are silent tissue reactions.
3. active tuberculosis in various organ systems: As shown in the next table, tuberculosis tends to express itself in 11 different organ systems masquerading as distinct clinical entities despite the same underlying TB pathogen.
http://www.nethealthbook.com/tuberculosis.html
Exposure: This occurs when a person has been in contact, or exposed to, another person who is thought to have or does have TB. The exposed person will have a negative TB skin test, a normal chest x-ray, and no symptoms of the disease.
TB infection: This occurs when a person has the TB bacteria in his/her body, but does not have symptoms of the disease. This person would have a positive skin test, but a normal chest x-ray and no illness.
TB disease: This describes the person who has symptoms of an active infection. The person would have a positive skin test, a positive chest x-ray, and might be ill.
http://www.healthsystem.virginia.edu/uvahealth/peds_infec...
I hope this is what you are looking for. I am so sorry that your family is having to go through this.