Satapathy P, Das D, Murmu BN, Kar SK. Decontamination of sputum for longer time in sodium hydroxide for isolation of Mycobacterium tuberculosis.
Int J Mycobacteriol 2014;
3:290-2. [PMID:
26786630 DOI:
10.1016/j.ijmyco.2014.09.006]
[Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2014] [Accepted: 09/21/2014] [Indexed: 11/19/2022] Open
Abstract
Decontamination by modified Petroff's method is being practiced in many laboratories carrying out Mycobacterium tuberculosis culture and drug susceptibility testing. The method exposes mycobacteria to 4% sodium hydroxide for 30min. However, laboratories in developing countries with limited resources might be using a type of centrifuge that does not open during power failures and exposes the mycobacteria to alkali for longer periods. Out of 28 smear-positive specimens processed, 85.7%, 85.7% and 60.7% of specimens showed a positive culture after exposure to alkali for 0.5, 1.0 and 72h. Laboratories compelled to expose the mycobacteria for a longer duration of time can still attempt isolation for culture as only a small amount of bacteria are needed for culture positivity.
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