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Tonicity in Animals

Tonicity in Animals

The tonicity of a solution determines if a cell gains or loses water in that solution. The tonicity depends on the permeability of the cell membrane for different solutes and the concentration of nonpenetrating solutes in the solution within and outside of the cell. If a semipermeable membrane hinders the passage of some solutes but allows water to follow its concentration gradient, water moves from the side with low osmolarity (i.e., less solute) to the side with higher osmolarity (i.e.,...

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Author Spotlight: Assessing Pain and Promoting Animal Welfare in Laboratory Animals Infected with Trypanosoma evansi

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Tetanus in animals.

Michel R Popoff¹

¹Bacterial Toxins, Institut Pasteur, Paris, Cedex, France.

Journal of Veterinary Diagnostic Investigation : Official Publication of the American Association of Veterinary Laboratory Diagnosticians, Inc

|February 20, 2020

Summary

This summary is machine-generated.

Tetanus is a neurologic disease caused by tetanus toxin from Clostridium tetani bacteria. Diagnosis relies on clinical signs, as identifying the bacteria in wounds is challenging.

Keywords:

Clostridium tetani animals diagnosis tetanus tetanus toxin

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Area of Science:

Neurology
Microbiology
Veterinary Medicine

Background:

Tetanus is a severe neurologic disease characterized by spastic paralysis in humans and animals.
It is caused by tetanus toxin (TeNT) produced by the soilborne bacterium Clostridium tetani.
Wound contamination with C. tetani spores is the primary route of infection.

Purpose of the Study:

To provide an overview of tetanus, its causative agent, and diagnostic challenges.
To highlight the varying sensitivity to tetanus toxin across different species.
To emphasize the clinical basis of tetanus diagnosis.

Main Methods:

Review of existing literature on tetanus pathophysiology and diagnosis.
Analysis of Clostridium tetani characteristics and toxin production.
Comparison of species susceptibility to tetanus toxin.

Main Results:

Clostridium tetani is an environmental, gram-positive, sporulating bacterium.
Horses, sheep, and humans are highly sensitive to tetanus toxin, while cattle, dogs, and cats are more resistant.
Diagnosis is primarily clinical due to difficulties in identifying C. tetani at wound sites.

Conclusions:

Tetanus diagnosis relies heavily on recognizing characteristic clinical signs of spastic paralysis.
The environmental nature of Clostridium tetani and challenges in its direct identification complicate early diagnosis.
Understanding species-specific sensitivity to tetanus toxin is crucial for veterinary management.