sentences:  Currently the majority of multidrug-resistant cases of TB are due to one strain of TB bacteria called the Beijing lineage.This process accelerates if incorrect or inadequate treatments are used, leading to the development and spread of multidrug-resistant TB (MDR-TB).Incorrect or inadequate treatment may be due to use of the wrong medications, use of only one medication (standard treatment is at least two drugs), not taking medication consistently or for the full treatment period (treatment is required for several months).