Strep Throat Health Article

Definition

Strep throat is a contagious infection caused by the bacterium Streptococcus pyogenes.

Description

Strep throat primarily affects children, especially those between the ages of five and 15. Adults whose immune systems have been weakened by stress or other infections are also at risk. Most sore throats are associated with viral infections such as the common cold or the flu. Strep throat is responsible in only about 10%–15% of cases. Many people carry Streptococcus pyogenes in their systems without even knowing it. It can survive in the lining of the throat or nose for years without producing symptoms. Almost 20% of people in general good health may be harboring this bacterium unsuspectingly, according to one statistic.

Strep throat is often mistaken for a cold or the flu. It is important, however, to identify strep throat because if left untreated it can lead to serious health problems. In rare cases, untreated strep throat may increase the risk of developing scarlet or rheumatic fever. Rheumatic fever, in turn, is associated with meningitis and diseases affecting the heart, skin, kidneys, and joints. Strep throat may return repeatedly if not treated effectively the first time.

Another reason for getting treatment for strep throat is that Streptococcus pyogenes belongs to a group of diseasecausing bacteria that produce superantigens. Superantigens are a group of toxins that have the ability to trigger excessive and abnormal activation of the body's T cells. T cells are produced in the thymus gland and regulate the human immune system's response to infection. Superantigens are being studied intensively for their roles in causing disease. Streptococcus pyogenes and Staphylococcus aureus together produce 19 different superantigens.

Causes & symptoms

Most people develop strep throat through close contact with someone who has an untreated strep infection. Infected mucus from the nose or throat is often spread via sneezing or coughing. Carriers of Streptococcus pyogenes who do not show symptoms of strep throat are less likely to infect others, as are people with strep throat who have received antibiotic therapy for 24 hours or more. Strep throat is not usually transmitted through casual contact. In rare cases, strep can develop after exposure to infected food, dairy products, or water.

People with weakened immune systems are more likely to become infected with strep throat. This infection can occur when the body is battling a cold or the flu. Stress or physical exhaustion can also weaken the immune system and increase the risk of bacterial infection. Strep throat usually strikes during the winter months. Symptoms develop two to four days after being infected.

While cold or flu symptoms often develop gradually over a period of several days, the symptoms associated with strep throat occur with little warning. Classic symptoms of strep include sore throat and fever. Other tell-tale signs may include swollen and tender lymph glands in the neck, redness on the inside of the throat, inflamed tonsils or gray/white patches on the tonsils, and headache. Trouble swallowing can also occur, and red specks may be visible on the roof of the mouth. Nausea and stomach pain are more likely in children infected with strep. Unlike a cold or the flu, strep throat does not usually produce cough or a stuffy, runny nose.