The key differences between antigenic and metabolic toxemia are:
- Antigenic toxemia is caused by toxins produced by bacteria, such as exotoxins, enterotoxins, and endotoxins. Metabolic toxemia is caused by abnormal accumulation of toxic metabolic products in the body due to incomplete excretion or abnormal metabolism.
- Examples of causes of antigenic toxemia include exotoxins from Clostridium bacteria, enterotoxins from E. coli, and endotoxins from gram-negative bacteria like E. coli and Salmonella. Metabolic toxemia can be caused by conditions like ketonemia (ketosis) and lactic acidemia.
- Ant
APOPTOSIS , DESCRIPTION, CELL INJURY,
Cell injury that damage DNA ,
loss of growth factors. ,
Direct action of cytokines (e.g., tumor necrosis factor) ,
Immune system action (e.g., natural killer cells or cytotoxic T lymphocytes).
Viral infection (eg HIV, Hepatitis)
, Sublethal damage to the cells , by ionizing radiation, hyperthermia, toxins
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2. Definition of toxemia
Toxemia is a clinical systemic state caused by a
widespread activation of host defense mechanisms
to the presence of toxins produced by bacteria or
injury to tissue
Toxemia does not include the diseases caused by
toxic substances produced by plants or insects or
ingested organic or inorganic poisons
3. Definition of endotoxemia
most common form of toxemia in animals, caused by
presence of lipopolysaccharide cell-components of
Gram-negative bacteria in the blood, and characterized
clinically by abnormalities of many body system
Alteration of cardiopulmonary function
Neutropenia, lymphocytopenia
Decreased organ blood flow and metabolism
Increased vascular permeability
Decreased GIT motility
Decreased perfusion of peripheral tissue leading to shock
A high case fetality
5. Exotoxins
These are protein substances produced by
bacteria that diffuse into the surrounding medium.
The important bacterial exotoxins are those
produced by Clostridium spp., for which
commercial antitoxins are available.
They may be ingested preformed, as in botulism,
or produced in large quantities by heavy growth in
the intestines, such as in enterotoxemia, or from
growth in tissue, as in blackleg and black disease.
6. Enterotoxins
These are exotoxins that exert their effect
principally on the mucosa of the intestine, causing
disturbances of fluid and electrolyte balance.
The most typical example is the enterotoxin
released by enterotoxigenic E. coli, which causes a
hypersecretory diarrhea in neonatal farm animals.
7. Endotoxins
The endotoxins of several species of Gram-negative
bacteria are a major cause of morbidity and mortality in
farm animals.
The endotoxins are lipo-polysaccharides found in the outer
wall of the bacteria.
Endotoxins are released into the immediate surroundings
when thebacteria undergo rapid proliferation with production
of unused sections of bacterial cell wall or, most commonly,
when the bacterial cell wall breaks.
Endotoxin gains access to the blood when there is a severe
localized infection, such as a coliform mastitis in dairy
cattle, or a disseminated infection, such as coliform
septicemia in newborn calves.
8. Metabolic toxin
These may accumulate as a result of
incomplete elimination of toxic materials
normally produced by body metabolism,
or by abnormal metabolism
Normally,
toxic products produced in the alimentary
tract or tissues are excreted in the urine
and feces or detoxified in the plasma and
liver.
When these normal mechanisms are
disrupted, particularly in hepatic dys
function, the toxins may accumulate
beyond a critical point and the syndrome
of toxemia appears.
Examples: ketonemia (ketosis) and lactic acidemia
9. Clinical signs of Acute toxemia
The syndrome varies with the speed and severity of the toxic
process but the variations are largely of degrees.
Depression, anorexia and muscular weakness are common in
acute endotoxemia.
Calves do not suck voluntarily and may not have a suck reflex.
Scant feces are common but a low-volume diarrhea may also
occur.
The heart rate is increased and initially the intensity of the heart
sounds is increased, but later as the toxemia worsens the intensity
may decrease.
The pulse is weak and rapid but regular.
A fever is common in the early stages of endotoxemia but later the
temperature may be normal or subnormal.
Terminally, there is muscular weakness to the point of collapse
and death occurs in a coma or with convulsions.
10. Clinical signs of endotoxemia
Endotoxemia is most commonly associated with bacteremia
or septicemia due to infection with Grain-negative
organisms, especially E. coli.
The clinical findings of severe endotoxemia include:
Depression
Hyperthermia followed by hypothermia
Tachycardia followed by decreased cardiac output
Decreased systemic blood pressure
Cool skin and extremities
Diarrhea
Congested mucosae with an increased capillary refill time
Muscular weakness, leading to recumbency.
11. Chronic toxemia
Lethargy, separation from the group, inappetence,
failure to grow or produce and emaciation are
characteristic signs of chronic toxemia.
12. Haematological changes
Leukocytosis and neutrophilia occur with mild
endotoxemia
leukopenia, neutropenia and lymphopenia increase
in severity and duration with increasing severity of
endotoxemia.
13. Serum biochemistry
A low plasma glucose concentration, high serum
urea concentration (nonprotein nitrogen)
Low albumin and protein
Adults have :
Low ca
Low Mg
Low Ph
Low K
14. Treatment
Removal of foci of infection (ambilicus infection in
calves)
Antimicrobial agent with Gm-ve spectrum
Streptomycine
Gentamycin
Polymyxin B
Aggressive fluid therapy IV to restore cardiac
output and increase urine output.
Lactated ringer solution
Isotonic saline solution
15. Treatment (cont)
Hypertonic saline (7.5 % Nacl) or sod. Bicarb may
enhance tissue perfusion.
NSAID (analgesic, antipyretic and anti-inflammatory
effect)
Phenylbutazone (phenylo-ject)
Flunixin (fendyne)
Glucocorticoid such as dexamethazone to improve
cellular metabolism and gluconeogenesis
Antisera (hyperimmune serum)
Anti-lipid antibodies to bind to LPS preventing inflammatory
cascade