The Gram-positive Bacilli of Medical Importance

These flashcards cover key concepts and details about gram-positive bacilli of medical importance, including their characteristics, diseases they cause, and methods of diagnosis and prevention.

Bacillus

A genus of bacteria that are typically rod-shaped, facultative anaerobes, and form endospores.

Endospores

A resistant structure formed by some bacteria, enabling survival in harsh conditions.

Anthrax toxins

Potent toxins produced by pathogenic strains of Bacillus anthracis that can cause severe disease.

Transmission routes for Bacillus anthracis

Inhalation of spores, inoculation through skin breaks, and ingestion of spores.

Cutaneous anthrax

A form of anthrax characterized by the formation of an ulcer called an eschar.

Diagnosis of Bacillus anthracis

Detection of large, nonmotile, Gram-positive bacilli in lung or skin samples.

Clostridium species

Anaerobic, endospore-forming bacilli found widely in soil and the gastrointestinal tracts of animals.

Food poisoning

An illness caused by the ingestion of food contaminated with toxins or pathogens.

Gas gangrene

A severe disease caused by Clostridium perfringens, involving necrosis and gas production.

Tetanospasmin toxin

A potent neurotoxin produced by Clostridium tetani, causing continuous muscle contractions.

Diagnosis of Clostridium tetani

Characteristic muscular contractions observed during clinical examination.

Clostridium difficile

An anaerobic bacterium associated with antibiotic-associated diarrhea and pseudomembranous colitis.

Pseudomembranous colitis

A severe colonic condition caused by Clostridium difficile resulting in inflammation and sloughing of intestinal lining.

Botulism

A serious illness caused by botulism toxins from Clostridium botulinum that can lead to paralysis.

Infant botulism

A form of botulism due to the ingestion of endospores by infants, often from honey.

Listeria monocytogenes

A non-endospore-forming bacillus capable of causing meningitis, particularly in at-risk populations.

Corynebacterium diphtheriae

The bacterium that causes diphtheria, known for forming a pseudomembrane in the throat.

Diphtheria toxin

A virulence factor produced by Corynebacterium diphtheriae that inhibits protein synthesis in eukaryotic cells.

Mycobacterium tuberculosis

The bacterium that causes tuberculosis (TB), characterized by a waxy cell wall.

Tuberculin skin test

A diagnostic test for tuberculosis exposure that uses purified protein derivative injected into the skin.

Leprosy

Also known as Hansen's disease, caused by Mycobacterium leprae, which primarily affects skin and peripheral nerves.