Is International Travel an Emerging Issue on Transmission of Beijing Lineage Mycobacterium tuberculosis?

Figure 2

Prevalence of Beijing lineage strains among sputum smear-positive pulmonary tuberculosis (PTB) patients diagnosed in a tertiary care hospital in Kandy, Sri Lanka, during February 2018–July 2019. PCR-negative DNA, due to insufficient quantity of DNA. PTB: pulmonary tuberculosis, DNA: deoxyribonucleic acid, CTAB; cetyl trimethylammonium bromide, PCR: polymerase chain reaction, LJ: Lowenstein–Jensen media, TCH: thiophene-2-carboxylic acid hydrazide, PNB: para-nitrobenzoic acid. Beijing/non-Beijing status could not be ascertained as they did not produce any band in Beijing multiplex PCR. However, they were confirmed as MTB upon conventional PCR.