Final answer:
CXR for TB diagnosis has the disadvantages of not differentiating between active and latent infections, having a high false positive rate, and limited availability in rural areas.
Step-by-step explanation:
The disadvantage of CXR for TB diagnosis is that it cannot differentiate between active and latent TB infections. This means that a chest X-ray will not be able to distinguish whether a person has an ongoing active infection or if they have a latent infection where the bacteria is in a dormant state. Another disadvantage is that CXR has a high false positive rate, meaning that it can incorrectly identify someone as having TB when they do not. Furthermore, CXR may not be widely available in rural areas, making it less accessible to individuals in those regions.