Streptococcal infections: Causes, Symptoms, and How to Treat

Written by Medicover Team and Medically Reviewed by Dr V Prathyusha Pedapati , Microbiologist

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1. Causes 2. Find a Doctor 3. Diagnosis 4. Treatment 5. FAQs

Streptococcus is a genus of bacteria responsible for many human infections. Streptococcus bacteria are Gram-positive cocci that appear in chains or pairs under the microscope. They are facultative anaerobes, meaning they can survive with or without oxygen.

Streptococcus is classified into several groups based on its hemolytic properties and Lancefield grouping, which is determined by the carbohydrate composition on the bacterial cell wall.

What are the Types of Streptococcus Infections?

Streptococcus bacteria are classified into different groups based on their characteristics and the types of infections they cause. Each type can affect different parts of the body and vary in severity.

Group A Streptococcus (GAS)

Group A Streptococcus, or Streptococcus pyogenes, is the most notorious of the streptococcal bacteria. It causes a range of illnesses, from mild infections like pharyngitis (strep throat) to severe diseases such as necrotizing fasciitis and toxic shock syndrome.

Symptoms

Sore throat
Fever
Swollen lymph nodes
Skin infections (impetigo)
Severe pain in the infected area (for necrotizing fasciitis)

Group B Streptococcus (GBS)

Group B Streptococcus, or Streptococcus agalactiae, primarily affects newborns, pregnant women, and the elderly. It is a leading cause of neonatal infections, such as sepsis, pneumonia, and meningitis.

Symptoms in Newborns

Fever
Difficulty feeding
Irritability
Lethargy
Respiratory distress

Symptoms in Adults

Urinary tract infections
Skin infections
Bone and joint infections

Streptococcus pneumoniae

Streptococcus pneumoniae, also known as pneumococcus, is a significant cause of bacterial pneumonia, meningitis, and otitis media (middle ear infections). It can also cause sinusitis and bacteremia.

Symptoms

Cough with phlegm or pus
Chest pain
Fever and chills
Shortness of breath
Stiff neck (meningitis)
Ear pain (otitis media)

Streptococcus mutans

Streptococcus mutans is primarily associated with dental caries (tooth decay). It metabolizes sugars to produce acid, which erodes tooth enamel and leads to cavities.

Symptoms

Toothache
Sensitivity to hot and cold
Visible pits or holes in the teeth

What Are the Common Causes of Streptococcus Infections?

Streptococcus infections spread through direct contact, respiratory droplets, or poor hygiene depending on the bacterial strain.

Close contact with infected individuals
Respiratory droplets from coughing or sneezing
Poor hand hygiene
Weak immune system
Contaminated surfaces or food
Poor oral hygiene

When to See a Doctor for Streptococcus Infections?

Persistent fever, sore throat, breathing difficulty, chest pain, or severe skin infections should be evaluated promptly. A microbiologist can diagnose the infection and start timely treatment.

You should see a doctor if you have:

Sore throat lasting more than a few days
High fever or swollen lymph nodes
Persistent cough or breathing problems

Get medical help immediately if:

Difficulty breathing or chest pain
Signs of sepsis or confusion
Severe swelling or rapidly spreading skin infection

These could be signs of a serious complication like Streptococcus Infections, which needs urgent care.

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How are Streptococcus Infections Diagnosed?

Accurate diagnosis of streptococcal infections is essential for appropriate treatment. Several diagnostic methods are employed to identify the presence of streptococcus bacteria.

Rapid Antigen Detection Test (RADT)

This test is commonly used to diagnose streptococcal pharyngitis. It detects the presence of streptococcal antigens in a throat swab within minutes.

Throat Culture

A throat culture is more sensitive than RADT and is considered the gold standard for diagnosing streptococcal pharyngitis. A sample from the throat is cultured on a blood agar plate, and the presence of GAS is confirmed by observing beta-hemolysis.

Blood Tests

Blood tests may be used to diagnose systemic streptococcal infections. Elevated levels of white blood cells and specific markers like C-reactive protein (CRP) can indicate an ongoing infection.

Imaging Studies

For severe infections like pneumonia, imaging studies such as chest X-rays or CT scans may be necessary to assess the extent of the disease.

What are the Treatment Options for Streptococcus Infections?

The treatment of streptococcal infections depends on the type of bacteria and the severity of the disease. Antibiotics are the cornerstone of therapy for most streptococcal infections. These include:

Penicillin

Penicillin is the first-line treatment for most streptococcal infections. It is highly effective against GAS and GBS.

Amoxicillin

Amoxicillin is commonly used for streptococcal pharyngitis and otitis media. It has a broader spectrum of activity compared to penicillin.

Cephalosporins

Cephalosporins are used for patients allergic to penicillin and are effective against a wide range of streptococcal infections.

Macrolides

Macrolides, such as erythromycin and azithromycin, are alternatives for patients with penicillin allergies. They are effective against GAS and pneumococcus.

Supportive Care

In addition to antibiotics, supportive care is crucial for managing symptoms and preventing complications.

Pain Relievers

Over-the-counter pain relievers like acetaminophen or ibuprofen can help reduce pain and fever.

Hydration

Maintaining adequate hydration is essential, especially for patients with fever and respiratory infections.

Surgical Intervention

In severe cases, such as necrotizing fasciitis, surgical intervention may be necessary to remove infected tissue and prevent the spread of the infection.

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What are the Complications of Streptococcus Infections?

If left untreated, streptococcal infections can lead to severe complications.

Rheumatic Fever

Rheumatic fever is a complication of untreated streptococcal pharyngitis. It can cause inflammation of the heart, joints, skin, and brain.

Post-Streptococcal Glomerulonephritis

This condition occurs after a streptococcal skin or throat infection. It involves inflammation of the kidneys and can lead to kidney damage.

Sepsis

Sepsis is a life-threatening condition that occurs when the infection spreads to the bloodstream. It requires immediate medical attention.

How can Streptococcus Infections be Prevented?

Preventing streptococcal infections involves both personal hygiene practices and medical interventions.

Personal Hygiene

Wash hands regularly with soap and water.
Avoid close contact with infected individuals.
Cover the mouth and nose when coughing or sneezing.

Vaccination

Vaccines are available for some types of streptococcus, such as Streptococcus pneumoniae. The pneumococcal vaccine is recommended for infants, older adults, and individuals with weakened immune systems.

Prophylactic Antibiotics

For individuals at high risk of developing streptococcal infections, such as those with a history of rheumatic fever, prophylactic antibiotics may be prescribed.

What Is the Recovery Process for Streptococcus Infections?

Most infections improve with proper antibiotic treatment and supportive care. Completing medications helps prevent recurrence and complications.

Complete the full antibiotic course
Maintain good hydration
Practice proper hygiene
Get adequate rest
Attend follow-up visits if symptoms persist
Monitor for complications such as rheumatic fever

Frequently Asked Questions

1. What causes streptococcal infections?

Streptococcal infections are caused by bacteria from the Streptococcus group, including S. pyogenes (Group A) and S. pneumoniae, which can infect various parts of the body.