The goal of this observational study is investigate the accuracy of the NanoDetect-TB kit in diagnosing tuberculosis (TB) using frozen serum and plasma samples collected from individuals suspected to have TB disease.

The main question[s] it aims to answer are:

• How does this investigational device compare to the gold standard for TB diagnosis of sputum culture?
• How does it compare to Acid-Fast Bacteria (AFB) smear microscopy and FDA-approved NAAT TB diagnostic assays?

Participants will be asked to have blood drawn and provide demographic and medical data for this study in a single visit.

Inclusion Criteria:

• Children and adults aged two years or older (including older adults that are 65+)
• Ability and willingness to provide informed consent/assent/permission, and a parent/legal guardian willing to give consent on the child's behalf for study participants aged 2-17 years
• Ability and willingness to perform study procedures, or parent/legal guardian to provide consent for a child to undergo study procedures on their behalf (when applicable)
• Clinical signs and symptoms typically associated with active TB disease including, but not limited to:

Cough for > two (2) weeks Lethargy, weakness, malaise Reduced playfulness (pediatric population) Weight loss or loss of appetite Failure to thrive (pediatric population) Fever Chest pain Night sweats

• Physician (or healthcare provider) suspicion of TB disease

Exclusion Criteria:

• Pregnancy (based on participant-provided information)
• Any physical or mental health condition for which participation in the study, as judged by the investigator, could compromise the well-being of the subject and/or prevent, limit, or confound protocol-specified procedures
• Critical illness needing immediate medical care
• Receipt of treatment for active TB or LTBI in the past 24 months

TB suspects at clinical sites for recruitment in Houston, Miami, and New York City.