
The PleoTM Preparation PleoTM San Brucel
Its Action Principle Brucella melitensis in Therapy
by Joachim Hartmann (biologist), Germany
©Copyright 1998 by Semmelweis-Verlag, Germany
(Explore Issue: Volume 8, Number 6)
The gram-negative PleoTM morphic bacillus Brucella
melitensis belongs to a genus of pathogens responsible for
mostly-chronic infectious diseases in man and animals. So-called "brucellosis" has three main variants:
1. Malta Fever
Pathogen: Brucella melitensis
Vectors: sheep, goats
2. Bang's Disease
Pathogen: Brucella abortus
Vector: cattle
3. Brucella Suis
Pathogen: Brucella suis
Vector: pigs, hares, reindeer
Host specificity is not strict; almost all domestic and wild animals, guinea pigs and even birds can become infected
with Brucellosis. Ultimately, all Brucella species are human and animal pathogenswhich has led to a situation in bacterial
nomenclature where only the species Brucella
melitensis is listed, under which all the others are subsumed. Since Brucella species are bound
to their host animals, they are considered obligate parasites
under natural conditions. As an animal disease, they mainly
induce abortions; the danger for man comes from the pathogen's excretions in infected animals, which gets into their milk, feces,
urine and sexual organ secretions. Man becomes infected mainly through working around and with the host animals, e.g. assisting
in abortions, slaughtering and meat processing (if the worker has even the slightest skin lesions). Another channel of
transmission is via the digestive tract through the consumption of raw milk or milk products. Interestingly, Brucellosis also represents
the most frequently caught infectious disease in laboratories that deal with microorganisms.
In man, it leads -- after local lymphogenic spreading of the pathogento a generalized infection in the bacteriemic stage.
The distinguishing feature of Brucellosis is a moderately high fever that recurs repeatedly over months and years (undulating
fever). In its most severe form, a typhous clinical picture with long-term high fever can even be fatal. Other characteristics
include organ manifestations due to granuloma and abscesses in the spleen and liver, as well as endocarditis, joint affections, etc.
This manifold disease picture of chronic Brucellosis, which is not easy to recognize in its nonspecific subfebrile form, also
encompasses neurological and psychological symptoms.
Growing Brucella in vitro is typically intracellular in granulocytes and monocytes, and cal also occur strongly PleoTM morphic in
a cell-wall-free form -- one reason for the long persistence of the
pathogen after the symptoms have faded. In this form, the germs
also escape the effects of antibiotic therapy and thus become foci for new fever attacks and organ manifestations.
As a gram-negative bacterium, Brucella
melitensis has a very complexly structured lipopolysaccharide cell wall.
Serological investigations have isolated three defined polysaccharides from
Brucella melitensis:
1. The so-called "native hapten"
2. Polysaccharide B
3. Cell-wall lipopolysaccharide
Bound up with the lipopolysaccharide structure are the classic antigens A and M described for Brucella, which have
been identified as polysaccharide side-chains. Lipopolysaccharide from
Brucella has been put into use for active immunization,
in which the production of protective antibodies is induced -- and yet no thymus-dependent immunological memory is
generated, which would be necessary for any long-term defense against Brucella.
Polysaccharide B is a serologically inactive low-molecular-weight (ca. 5000 D) polysaccharide, a cyclic glucane such as
also occurs in the bacterial species Rhizobium and Agrobacterium. It reacts neither with cattle serum nor with that of
inoculated cows. It represents a classical hapten which originates in the soluble cytoplasm of the bacterium.
The "native hapten" reacts with the serum of infected cattle, yet not with that of cattle who have been inoculated
with weakened living germs of Brucella
melitensis. It has been shown that it is identical with a side-chain of the cell-wall
polysaccharide of Brucella with a smooth colony form, and consists of an unusual pentasaccharide polymer. It is well suited to
discover infected animals in herds, by using the radial immune diffusion test, in which antibodies in animal blood lead to precipitation
of the Brucella hapten.
The preparation PleoTM San Brucel contains all the named polysaccharides, so that this agent has an immunizing effect, as well
as the classical antigen and antibody binding effect of the haptens which qualify it as an intermediate agent for nosode therapy.