- Anatomy of a Sore Throat Slideshow
- Take the Strep Throat Quiz
- Infectious Mononucleosis Slideshow
- Patient Comments: Streptococcal Infections - Treatment
- Group A streptococcal infections facts
- What is group A Streptococcus (GAS)?
- How are group A streptococcal (GAS) infections contracted?
- What diseases are caused by group A streptococcal infection?
- Are group A strep infections contagious?
- What is the contagious period for group A strep infections?
- What is the incubation period for group A strep infections?
- What are the symptoms and signs of GAS infections?
- What is invasive group A streptococcal disease? Who is most at risk for getting invasive GAS disease?
- What are the symptoms and signs of necrotizing fasciitis?
- What are the signs and symptoms of toxic shock syndrome (TSS)?
- How are group A streptococcal (GAS) infections diagnosed?
- What is the treatment for invasive group A streptococcal disease?
- What specialists treat group A streptococcal infections?
- What complications are seen with group A streptococcal infections?
- Is it possible to prevent group A streptococcal infections?
- What is the prognosis for group A streptococcal infections?
- Where can people find more information about group A streptococcal infections?
Are group A strep infections contagious?
In general, group A strep infections are contagious, but there are some qualifiers to this answer. For example, strep throat is contagious, but other infection types such as toxic shock syndrome are generally considered noncontagious; consequently, the answer depends on the specific type of infection and any extenuating circumstances.
What is the contagious period for group A strep infections?
For those infections that are considered to be contagious, the person is contagious in the incubation period (before any symptoms of the infection develop) and through the acute phase of the infection while the patient has symptoms. When symptoms stop, the person is usually noncontagious unless the individual becomes a carrier (colonized with group A strep but without symptoms).
What is the incubation period for group A strep infections?
The incubation period for GAS pharyngitis and cellulitis varies from about one to five days. Other types of GAS infection may develop rapidly (necrotizing fasciitis) while others (scarlet fever) may take a week or more to develop.
What are the symptoms and signs of GAS infections?
GAS infections can produce many different signs and symptoms:
- Pharyngitis (strep throat/tonsillitis): sore throat, irritation with swallowing, white patches on tonsils (exudates), swollen lymph nodes on the neck, fever; pharyngitis with fever and white patches on tonsils are important but not definitive signs of GAS pharyngitis.
- Scarlet fever: pharyngitis symptoms (see above), pastia (pink or red lines formed of confluent petechiae, which are small purple or red spots in the skin caused by minor blood vessel breaks) that are found in skin creases, especially the flexor surface of the elbow), fever, rash on neck and chest, then entire body with sandpaper texture, muscle aches, abdominal pain, swollen red tongue (strawberry tongue)
- Rheumatic fever: inflammation of the joints, heart valve damage
- Glomerulonephritis: inflammation of the kidneys, impaired kidney function
- Necrotizing fasciitis: tissue destruction that progresses rapidly
- Toxic shock syndrome: rapidly progressing organ failure with low blood pressure
Most of the diseases listed here for GAS infection usually occur after an initial pharyngitis, with necrotizing fasciitis and toxic shock sometimes occurring without a detectable initial pharyngitis infection. Other disease processes involving GAS organisms (for example, meningitis, bone infections, pneumonia, wound infections, and others) produce the typical symptoms associated with these disease processes and clinically are not unique for GAS or other pathogenic organisms.