Anergy means that the intradermal tuberculin test is negative.
The lack of cellular defence against M. tuberculosis can be due to several circumstances. Both a previous lack of contact with M. tuberculosis and a weakened immune defence can be decisive for the negative tuberculin test.
Examples:
- Tuberculous primary complex.
- Tuberculosis cutis miliaris disseminata.
- Tuberculosis (miliaris) ulcerosa mucosae et cutis.
- Tuberculosis fungosa serpiginosa.