Diphtheria , also known as croup , is an infectious disease caused by the bacterium Corynebacterium diphtheriae. Diphtheria is characterized by an infection that typically occurs in the throat and nasal cavity. The bacteria produce a harmful substance called a toxin. This toxin forms a thick, gray or white coating on the throat and respiratory tract. This coating can block the throat and cause respiratory problems.

Diphtheria was once a significant public health problem worldwide. However, the disease has declined significantly thanks to the diphtheria vaccine. Vaccination against diphtheria is routinely administered during childhood and largely prevents the spread of the disease.

What causes diphtheria?

Diphtheria, or diphtheria, is a disease caused by the bacterium Corynebacterium diphtheriae. This bacterium can be transmitted from one infected person to another through respiratory droplets or direct contact. Diphtheria is typically spread through:

• Airborne transmission: When an infected person coughs, sneezes, or talks, tiny droplets containing the bacteria can spread through the air. Diphtheria can be spread by breathing in these droplets or by touching an infected surface and then touching the mouth, nose, or eyes.
• Contact transmission: Direct contact with an infected person, especially exposure to infected throat or nasal secretions, can cause diphtheria. Bacteria can also be transmitted through shared objects, such as toys and drinking glasses.

Diphtheria vaccine protects against the disease and helps prevent its spread. Therefore, vaccination programs and routine vaccinations play an important role in reducing diphtheria cases.

The bacterium Corynebacterium diphtheriae typically inhabits the mucosal surfaces of the upper respiratory tract, such as the throat and nose. There, it multiplies and produces a harmful substance called a toxin. This toxin damages tissue, causes inflammation, and leads to the formation of a characteristic white or gray coating in the throat. This coating can obstruct breathing and lead to serious complications.

What are the risk factors for diphtheria?

Some factors that increase the risk of contracting diphtheria include:

• Being unvaccinated or incompletely vaccinated: Diphtheria vaccine provides protection against the disease. Individuals who are unvaccinated or whose vaccination schedule has not been completed are at higher risk for diphtheria.
• Travel: Diphtheria is still common in some areas. Travelers to these areas are at risk of exposure to the virus. Traveling to areas with low vaccination rates may also increase the risk.
• Childhood: Diphtheria usually occurs in childhood. Because children haven't yet developed full immunity, they may be more susceptible to infection.
• Crowded living conditions: Diphtheria can spread easily from one infected person to another through the air or direct contact. Living in crowded places or being in frequent close contact can increase the risk of infection.
• Conditions that weaken the immune system: Conditions that affect the immune system can increase the risk of contracting diphtheria. The risk of infection may be higher in people with immunodeficiency diseases such as HIV/ AIDS or in cancer patients receiving chemotherapy.
• Inadequate hygiene measures: In environments lacking good hygiene practices, bacteria are more likely to spread easily. Failure to maintain proper hygiene and sanitation can increase the risk of diphtheria infection.

Diphtheria risk factors may vary from person to person. However, preventive measures such as vaccination and proper hygiene practices play an important role in reducing the risk of diphtheria infection.

What are the symptoms of diphtheria?

Diphtheria (diphtheria) usually manifests with symptoms resulting from infection in the throat and nasal cavity. Symptoms may include:

• Severe sore throat: One of the main symptoms of diphtheria infection is a severe and uncomfortable sore throat. It may also be accompanied by a burning or irritated feeling in the throat.
• White or gray plaque formation: Diphtheria can cause a characteristic plaque to form in the throat. This plaque can be gray or white, thick, and sticky. It can appear at the back of the throat, on the tonsils, or in other areas of the throat.
• Weakness and Fatigue: Diphtheria can be associated with low energy, weakness, and a general feeling of tiredness. As the disease spreads and toxins take effect in the body, a person may feel weak.
• Fever: A fever may occur due to diphtheria. Fever is the body's defense mechanism against infection.
• Cough and runny nose: In some cases of diphtheria, respiratory symptoms such as cough and runny nose may also occur. These usually indicate that the respiratory tract is affected in addition to the throat infection.
• Headache: Diphtheria infection may be associated with headache symptoms such as headache or dizziness.
• Swollen neck and enlarged lymph nodes: Diphtheria can cause neck swelling and enlarged lymph nodes. This is a sign that the immune system is fighting the infection.

While some cases of diphtheria may present with mild symptoms, others can lead to more serious complications. Serious problems can occur, especially if the toxins affect other organs, such as the heart, nervous system, or respiratory system. Early diagnosis and treatment are crucial.

How is diphtheria diagnosed?

Diphtheria (diarrhea) is usually diagnosed based on symptoms, a physical examination, and laboratory tests. Common methods used to diagnose diphtheria include:

• Evaluation of signs and symptoms: In a patient with suspected diphtheria, symptoms such as sore throat, white or gray coating, fatigue, and fever are assessed. The patient's vaccination status and any close contacts are also taken into account.
• Physical exam: The doctor will carefully examine the patient's throat and lymph nodes. He or she will look for signs such as a gray or white coating on the throat and swelling or tenderness in the lymph nodes.
• Bacterial culture: The most definitive method for diagnosing diphtheria is to perform a bacterial culture, which involves taking a swab from the throat or nasal cavity. This sample is analyzed in the laboratory for the presence of the bacterium Corynebacterium diphtheriae.
• Toxin detection: Toxin detection can also be used in the diagnosis of diphtheria. For example, a sample taken from the patient's throat or nasal cavity can be subjected to laboratory testing to detect the presence of toxins.

Diagnosis of diphtheria is made through symptom assessment and laboratory testing. Early diagnosis is crucial because diphtheria can lead to serious complications. Once diagnosed, appropriate treatment can be initiated and the spread of the infection prevented.

How to prevent diphtheria?

• Vaccination : The diphtheria vaccine is the most effective method of protection against the disease. The diphtheria vaccine is usually administered as a combination vaccine containing diphtheria, tetanus, and pertussis. Vaccines should be completed as part of the routine childhood vaccination program. Regular vaccinations are also recommended for adults. Vaccination prevents the spread of diphtheria infection and can prevent serious complications.
• Hygiene measures : Good hygiene practices are important to prevent the spread of infections. This includes regular hand washing, covering your mouth and nose when coughing or sneezing, and limiting close contact with infected people. Additionally, regular cleaning and disinfection of shared objects also reduces the risk of infection.
• Limiting close contact: Close contact with people infected with diphtheria can facilitate the spread of the disease. Visiting crowded places or attending school or work with infected people increases the risk of spreading the infection. Therefore, it is important to limit close contact while a person diagnosed with diphtheria is undergoing treatment.
• Travel precautions: Diphtheria is still prevalent in some areas. Travelers to these areas should check their vaccination status and update their vaccinations if necessary. It may also be helpful to obtain travel advice from your healthcare provider before traveling.

In addition to vaccination and hygiene measures, raising public awareness is also important for preventing diphtheria. Health authorities are encouraging regular vaccinations and organizing public hygiene awareness campaigns. These measures help reduce and control diphtheria cases.

How is diphtheria treated?

Treatment for diphtheria is usually carried out in the hospital and may include the following:

• Antitoxin therapy: Diphtheria antitoxins are administered to neutralize the toxins caused by diphtheria infection. These antitoxins are used to stop the spread of the disease and prevent complications related to the toxins. Antitoxins are administered intravenously, depending on the severity of the infection and the patient's condition.
• Antibiotic therapy: Antibiotics are used to control diphtheria infection. Penicillin or erythromycin are generally the preferred antibiotics. Antibiotics treat the infection and prevent the spread of bacteria.
• Supportive care : Diphtheria infection can lead to serious complications, so the patient may require supportive care. Supportive care includes various measures, such as ensuring comfort, managing respiratory problems, improving nutrition, and maintaining fluid balance. Respirators or oxygen therapy may be necessary for respiratory support.
• Quarantine and isolation: People with diphtheria are quarantined to prevent the spread of infection. This aims to limit the patient's close contact and prevent the infection from spreading to others.

Regular doctor checkups and follow-up are important throughout the treatment process. It's also important to update the diphtheria vaccine according to the vaccination schedule after treatment is completed. Early diagnosis and treatment reduce the complications of diphtheria infection and speed up the patient's recovery.