Trend of Mantoux Positivity in a Tertiary Health Institution in Nigeria: A Secondary Data Analysis

Abstract

Background: Mantoux test is the most widely used screening test that aid diagnosis of latent tuberculosis infection (LTBI) especially in resource poor countries. This study aimed to determine the seven year trend of Mantoux test result at the University of Port Harcourt Teaching Hospital, Rivers State Nigeria. Methods: A secondary data analysis was carried out on abstracted data from 2011 to 2017 in the Mantoux result register. Descriptive statistics was computed for all categorical variables. Chi-square of trend was used to assess significant differences in positivity. P-value less than 0.05 was considered significant. Results: Using a cut-off point of ≥10 mm diameter, a total of 5863 clients were screened for TB. Chi square for trends showed statistical significant decreasing proportion of significant Mantoux reaction status among clients over the study period. Conclusion: The study showed a high prevalence of negative Mantoux reaction compared to positive reaction. Trend analysis showed a notable downward plunge of significant Mantoux positivity. The trend was towards continuous reduction in Mantoux test result positivity suggesting a tailing of LTBI in this region.