Multiple skin testing of tuberculosis patients with a range of new tuberculins, and a comparison with leprosy andMycobacterium ulceransinfection

Abstract

SUMMARYFour hundred and seventy tuberculosis patients were each skin tested with four of a range of 17 mycobacterial reagents in four countries in all of which tuberculosis and leprosy were endemic. Sixteen of the reagents were new tuberculins prepared from extracts of living mycobacteria disrupted by ultrasonic disintegration and the last was PPD, RT23.The effect that tuberculosis exerted on the delayed-type skin test response to these antigens was assessed by comparing results for tuberculosis patients with those for Tuberculin positive and Tuberculin negative control populations. Tuberculosis patients on Rifampicin therapy showed no difference in their skin test responses to any of the antigens from those patients on other forms of anti-tuberculosis treatment.Amongst the normal population it was found that possession of Tuberculin positivity was associated with an enhanced response to all the other mycobacterial antigens with the exception of A*-in which demonstrated a reciprocal relationship with Tuberculin in Burma. It was also noted, in Burma particularly, that sensitization to mycobacterial species other than Mycobacterium tuberculosis, especially to the slow growers, plays a role in determining responses to different mycobacterial species.In tuberculosis patients enhanced skin test responses were also seen but only in those countries, e.g. Libya, where the prevalence of mycobacterial species was low. Where mycobacteria were common, as in Burma, the converse was true and tuberculosis was associated with a diminished skin test response to each antigen. The high prevalence of A*-in positivity in Burma, its reciprocal relationship with Tuberculin there and the results for all the antigens in the tuberculosis patients indicate that the cell mediated skin test response may have a threshold. If this is exceeded the skin test becomes negative so that non-reactors then include those who have been excessively sensitized as well as those who have not been sensitized. Despite this, a greater percentage of tuberculosis patients in each country responded to the specific reagent Tuberculin than did the control populations and their mean positive induration sizes were consistently larger. Nevertheless, amongst the tuberculosis patients in Burma 13% were complete non-reactors to Tuberculim and this apparent anergy also applied to the other reagents with which these individuals were tested.This differs from lepromatous leprosy where the anergic state pertain exclusively to M. leprae and a few seemingly closely related species. The breadth of anergy in M. ulcerans infection has not been measured but it is known to effect both Burulin and the PPD, RT23.Just as in leprosy and M. ulcerans infection, tuberculosis can be shown to have a disease spectrum here detected by multiple skin testing. The significance of this spectrum and its similarities with and differences from that of the other mycobacterioses is discussed.

Environmental mycobacteria in northern Malawi: implications for the epidemiology of tuberculosis and leprosy

“…All were prepared by sonication in boratebuffered saline of organisms grown on Sauton's medium and sterilized by filtration. The reagents were standardized to a concentration equivalent to 2 TU of RT23 [12].…”

Lack of skin test reactivity to common mycobacterial antigens in human immunodeficiency virus infected individuals with high CD4 counts.

“…9 Briefly, suspensions of live M tuberculosis (T), M avium serotype 4 (A-4) and serotype 8 (A-8), M intracellulare (AC), and M flavescens (F) were cultured on non-antigenic medium, sonicated in borate-buffered saline containing Tween 80, and sterilised by filtration. Protein concentrations for skin test use were standardised to 2 ,ug/ml.…”

The demonstration of two types of suppressor mechanism in leprosy patients and their contacts by quadruple skin-testing with mycobacterial reagent mixtures

“…Reactions of 2mm or more were taken as positive . 3 The following reagents were tested on every in dividual: (1) A pool of equal volumes of sonicate preparations of 12 differe nt slowly growing mycobacteria, each at a concentration of 1 mg protein/m l (reagent SG).…”