Drug - resistant tuberculosis is on the rise , with some strains immune to all major drugs . Extensively resistant TB reported in many countries but is likely to be in many more . About 450,000 new drug - resistant TB cases reported worldwide in 2008 . ` ` It 's probably in every country , '' one expert .
Drug-resistant TB is on the rise , with some strains immune to all major drugs . Extensively resistant TB reported in 92 countries but is likely to be in many more . About 450,000 new drug-resistant TB cases reported worldwide in 2012 . `` It 's probably in every country , '' says expert .