Potential of Mw as a prophylactic vaccine against pulmonary tuberculosis.

Abstract:

:Mycobacterium w (Mw), is a cultivable, non-pathogenic mycobacterium and has been tried extensively as an immunomodulator in leprosy. This has been found to be safe and has shown beneficial immunoprophylactic effect in population based, double blind placebo controlled trials in North India. These effects were also observed in the vaccine trials in South India. Keeping in view these beneficial effects and its earlier reported protective effect against tuberculosis in animals, its protective efficacy was evaluated in a rural population of about 28,948 people belonging to 272 villages in Ghatampur, Kanpur (India). The population was vaccinated with two doses (1st dose of 1x10(9) heat killed organisms followed 6 months later with a 2nd dose of 5x10(8) organisms) of Mw 10-13 years ago originally to investigate its effect against leprosy. The vaccine/placebo was given to healthy contacts of leprosy patients who had no evidence of suffering from tuberculosis. Incidence and prevalence of pulmonary tuberculosis in the present study was assessed in a blind manner by an active field survey and also retrospectively by history of anti tuberculosis treatment received by the patient in the intervening period (since vaccination), which was also corroborated by scrutinizing the medical records. Diagnosis was confirmed by standard clinical and bacteriological criteria. A total of 69 patients were diagnosed to be suffering from pulmonary tuberculosis during the survey which included 17 new sputum smear positive cases and 52 previously partially treated but still active pulmonary tuberculosis cases. The difference in the new sputum positive cases between the vaccinated (5/17) and placebo groups (12/17) was significant at 5% level of significance for 1 tailed test (Z>1.64). As 75% (52/69) of the cases had been diagnosed as suffering from pulmonary tuberculosis but had not taken adequate therapy all the cases diagnosed during the intervening period were recorded and re-analysis done. The differences are more significant at 1% level of significance for 1 tail test (Z>2.59) when all cases were analysed as a group. A small proportion 12.85% (total number=3036) of the contacts in the study population had BCG scars. On analysis of results on protection against tuberculosis in this group, BCG did provide protection against tuberculosis (p<0.01). In the placebo group the prevalence of tuberculosis was 1.11% which reduced to 0.70% for those who received Mw vaccine (p<0.01) which further decreased to 0.53% in those who had BCG scars and received Mw. These results thus provide evidence suggesting protective efficacy of Mw against pulmonary tuberculosis and that Mw merits investigation in future prospective immunoprophylactic trials along with other candidates for protection against pulmonary tuberculosis.

journal_name

Vaccine

journal_title

Vaccine

authors

Katoch K,Singh P,Adhikari T,Benara SK,Singh HB,Chauhan DS,Sharma VD,Lavania M,Sachan AS,Katoch VM

doi

10.1016/j.vaccine.2007.12.025

subject

Has Abstract

pub_date

2008-02-26 00:00:00

pages

1228-34

issue

9

eissn

0264-410X

issn

1873-2518

pii

S0264-410X(07)01497-1

journal_volume

26

pub_type

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