Bacteria and its Link to Strep A Infections

Strep A, scientifically known as Group A Streptococcus (GAS), is a bacteria that is commonly found on the skin or in the throat. Under specific conditions, these bacteria can lead to the development of diseases.

Various parts of the body can be affected by these infections, such as the throat, skin, middle ear, bloodstream, sinuses, lungs, heart valves and tissue beneath the skin.

The diagnosis of the infection can potentially be made by doctors through symptom evaluation, and it can be confirmed by identifying the bacteria in a sample of infected tissue, occasionally supplemented by imaging tests.

The human body harbors a variety of streptococci species, many of which exist without posing any harm. Although some of these species have the potential to cause infections, they can also be found in certain healthy individuals who remain asymptomatic. These individuals are commonly referred to as carriers.

Types of streptococcus

Streptococci are classified into various groups according to their physical characteristics and chemical constituents, and each group exhibits a propensity to induce particular infections. The groups that are most prone to causing diseases in humans include Group A, Group B, Group D (enterococcus), and Viridans.

How is strep A transmitted?

When an infected person coughs or sneezes, tiny droplets of secretions from their nose or throat are released into the air and can be inhaled by others.

Contact with infected wounds or sores on the skin can lead to the transmission of bacteria, especially in densely populated settings.

What are symptoms of strep A infections?

The symptoms of infections caused by Group A streptococcus can vary depending on the location of the infection.

Strep throat (pharyngitis): Strep throat primarily affects children aged 5 to 15, manifesting as a sore throat, fever, headache, and enlarged tonsils. Nevertheless, children under 3 years old may solely exhibit a runny nose, and the presence of additional symptoms like coughing, red eyes, hoarseness, diarrhea, or nasal congestion suggests a viral infection rather than strep throat.

Cellulitis: The skin affected by the infection turns red, while the underlying tissue experiences swelling, resulting in discomfort.

Impetigo: Typically, scaly, crusty sores with a yellowish hue develop.

Scarlet fever: The initial manifestation of the rash occurs on the facial area before extending to the torso and extremities. The texture of the rash resembles that of rough sandpaper. It is particularly severe in areas where the skin folds, such as the crease between the legs and the trunk. As the rash gradually diminishes, the skin undergoes peeling. Additionally, red bumps emerge on the tongue, which is covered by a yellowish white coating. Subsequently, the coating peels off, revealing a vivid red appearance of the tongue.

Scarlet fever, although uncommon, can still occur and tends to spread through close contact, particularly in schools or day care centers. It typically affects children and is often preceded by strep throat or streptococcal skin infections.

Necrotizing fasciitis: The fascia, which is the connective tissue enveloping the muscle, has become infected. Individuals experience abrupt chills, fever, and intense pain and sensitivity in the affected region. The skin may seem unaffected until the infection reaches a severe stage.

Complications of strep A infections

Untreated strep infections can lead to the development of complications. Some of these complications occur when the infection spreads to nearby tissue, resulting in sinusitis or mastoiditis, as well as complications involving distant organs like kidney inflammation or rheumatic fever. Additionally, toxic shock syndrome can occur, causing severe symptoms and organ failure due to toxins produced by certain bacteria.

How is strep A infection diagnosed?

The diagnosis of cellulitis and impetigo primarily relies on symptom evaluation. Nonetheless, doctors may choose to culture a sample from impetigo sores to facilitate the detection of other microorganisms that might be accountable.

X-rays, computed tomography, or magnetic resonance imaging along with culture are frequently employed by doctors to diagnose necrotizing fasciitis. To confirm the diagnosis, exploratory surgery is often required.

How is strep A infection treated?

Antibiotics are more effective in reducing symptoms in young children compared to adolescents and adults. However, they are still prescribed to prevent the spread of infection and complications such as middle ear, sinus, and mastoid bone infections, as well as to prevent rheumatic fever. Waiting 1 to 2 days for culture results before starting antibiotics does not increase the risk of rheumatic fever, except in cases where a family member has or had rheumatic fever. In such cases, immediate treatment is recommended for any strep infection in the family.

In general, the standard treatment duration for penicillin or amoxicillin is 10 days when taken orally. However, an alternative approach is to administer a single injection of benzathine, a long-lasting form of penicillin. If penicillin is not suitable, individuals can opt for erythromycin, clarithromycin, or clindamycin taken orally for 10 days, or azithromycin for 5 days.

Necrotizing fasciitis patients are given specialized care in an intensive care unit (ICU). The removal of necrotic and infected tissue through surgical means is crucial in the treatment of this condition.

How to prevent strep A infection?

To effectively prevent group A streptococcus infection, it is crucial to uphold proper hygiene practices. Regularly washing your hands, particularly after sneezing or coughing, as well as before handling, serving, or consuming food, is essential in reducing the transmission of bacteria.

It is important to maintain cleanliness on surfaces like bathroom sinks, door handles, and taps, as well as on clothes and bedlinen, in order to safeguard the well-being of everyone in your household.