Related Experiment Video

Updated: Jun 22, 2026

Implementation of a Permeable Membrane Insert-based Infection System to Study the Effects of Secreted Bacterial Toxins on Mammalian Host Cells
09:25

Implementation of a Permeable Membrane Insert-based Infection System to Study the Effects of Secreted Bacterial Toxins on Mammalian Host Cells

Published on: August 19, 2016

[Streptococcal infection and antistreptolisine O]

Anna M Romicka1

  • 1Klinika i Poliklinika Reumatologii Wieku Rozwojowego, Instytut Reumatologii w Warszawie. kancelaria@ir.ids.pl

Przeglad Lekarski
|June 3, 2009
PubMed

Insights

Acute pharyngitis and tonsillitis are common, often viral. Group A Streptococcus is a key bacterial cause, necessitating diagnosis via clinical signs and tests like antistreptolysin O (ASO) titers for recent infections.

Area of Science:

  • Infectious Diseases
  • Microbiology
  • Immunology

Context:

  • Acute pharyngitis and tonsillitis are frequent illnesses, predominantly viral.
  • Group A beta-hemolytic Streptococcus remains a dominant bacterial pathogen in upper respiratory infections.
  • Potential sequelae, such as rheumatic fever, necessitate accurate diagnosis and treatment.

Purpose:

  • To highlight the diagnostic importance of clinical manifestations combined with microbiological and serological tests for acute pharyngitis and tonsillitis.
  • To emphasize the role of Group A Streptococcus as a significant bacterial pathogen.
  • To clarify the interpretation of antistreptolysin O (ASO) titers in identifying recent streptococcal infections.

Summary:

  • Most sore throat episodes are viral, but Group A beta-hemolytic Streptococcus is a primary bacterial concern.
  • Diagnosis requires integrating clinical findings with microbiological and serological testing.
  • Elevated antistreptolysin O (ASO) antibody titers indicate a recent streptococcal infection, not active rheumatic fever.

Impact:

  • Improved diagnostic accuracy for acute pharyngitis and tonsillitis.
  • Timely identification of Group A Streptococcus infections to prevent complications like rheumatic fever.
  • Guidance on interpreting serological markers for effective patient management.

More Related Videos

Visualization of Bacterial Toxin Induced Responses Using Live Cell Fluorescence Microscopy14:29

Visualization of Bacterial Toxin Induced Responses Using Live Cell Fluorescence Microscopy

Published on: October 1, 2012

Related Concept Videos

Streptococcal Pharyngitis01:27

Streptococcal Pharyngitis

Streptococcal pharyngitis, commonly known as “strep throat,” is an acute infection of the oropharyngeal tissues caused by the Gram‑positive Group A Streptococcus (Streptococcus pyogenes). Transmission occurs primarily through respiratory droplets expelled during coughing, sneezing, or talking.Mechanisms of Host Entry and Immune EvasionUpon entering the host, S. pyogenes adheres to the mucosal epithelial cells of the pharynx via surface proteins, notably lipoteichoic acid and the antiphagocytic...
Tonsillitis I: Introduction01:30

Tonsillitis I: Introduction

Tonsillitis is inflammation of the tonsils, which are two lymphoid tissue masses at the back of the throat. This condition can cause discomfort and irritation in the throat.
Etiology
Three primary contributing factors have been identified.
Staphylococcal Skin Infections01:29

Staphylococcal Skin Infections

Staphylococcus aureus is a Gram-positive coccus that resides harmlessly on the skin and mucous membranes of healthy individuals. When the skin barrier is breached, it can shift from a commensal to an opportunistic pathogen. This transition is facilitated by surface adhesins, such as clumping factor B and S. aureus surface protein G (SasG), which bind to structural proteins, including loricrin and cytokeratin, in the damaged epidermis. Protein A, another key factor, binds the Fc region of...
Botulism01:22

Botulism

Botulism is a life-threatening neuroparalytic condition caused by botulinum neurotoxin, which is produced by the bacterium Clostridium botulinum, a Gram-positive, spore-forming, obligate anaerobe.In adults, the toxin enters the body in different ways: in foodborne botulism, the preformed toxin is absorbed in the intestine. In wound botulism, spores grow in injured tissue and release the toxin into the blood. Infant botulism differs mechanistically from adult forms. In infants, botulism commonly...
Diphtheria01:28

Diphtheria

Diphtheria is an acute, toxin-mediated infectious disease that primarily affects the upper respiratory tract. It is caused by Corynebacterium diphtheriae, a Gram-positive, pleomorphic rod that lacks spore-forming capability and exhibits a characteristic club-shaped morphology under microscopic examination. While C. diphtheriae can asymptomatically colonize mucosal surfaces, clinical disease manifests only when the bacterial strain is lysogenized by a specific β-corynephage. This phage...
Tetanus01:29

Tetanus

Tetanus is a life-threatening neurological disorder characterized by persistent muscle contractions and spastic paralysis. It is caused by Clostridium tetani, a motile, Gram-positive, rod-shaped, obligate anaerobe. These bacteria produce terminal endospores, giving them a distinctive “lollipop” or “tennis-racket” appearance. They thrive in anaerobic environments, such as those found in deep puncture wounds.Once introduced into the body, the spores germinate into vegetative cells. These cells...