Bacteria adapting to medicine and there by making it ineffective has been a public health concern for years now especially among those who's body immune systems are weakened by HIV or old age. Her are a few articles on the current trend seen among resistant Tuberculosis.
http://today.msnbc.msn.com/id/46010460/ns/today-today_health/t/india-reports-new-strain-totally-drug-resistant-tuberculosis/#.TxRQtm-JdDQ
http://www.niaid.nih.gov/topics/tuberculosis/understanding/whatistb/scientificillustrations/pages/extensivelydrugresistantillustration.aspx
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