However, patients with a weak immune system may not be able to do this - at which point the tuberculosis bacteria starts to spread in the lung.

BBC: TB link to ethnic minority poverty

Tuberculosis can lie dormant in a person for years and then strike when the immune system is weak.

BBC: NEWS | Health | Breathalyser detects tuberculosis

Who knows whether the symptoms are just being noticed once all the activities wind down or whether a child is simply fatigued enough that their immune system becomes a little weak.

CNN: Why do kids always get fevers on Sunday nights?