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Mycoplasma pneumoniae: Symptoms & Treatment

Mycoplasma pneumoniae is a bacterium that commonly causes atypical pneumonia and respiratory infections, especially in children and young adults.

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Things worth knowing about "Mycoplasma pneumoniae"

Mycoplasma pneumoniae is a bacterium that commonly causes atypical pneumonia and respiratory infections, especially in children and young adults.

What is Mycoplasma pneumoniae?

Mycoplasma pneumoniae is a cell-wall-free bacterium and one of the most common causes of respiratory tract infections worldwide. Because it lacks a rigid cell wall, it is naturally resistant to many standard antibiotics such as penicillin. It is the causative agent of so-called atypical pneumonia, sometimes referred to as “walking pneumonia,” because symptoms are often mild enough for patients to remain ambulatory and continue their daily activities.

Causes and Transmission

Mycoplasma pneumoniae is spread primarily through respiratory droplets produced when an infected person coughs or sneezes, as well as through close physical contact. The bacterium spreads particularly easily in enclosed community settings such as schools, kindergartens, military barracks, and care homes. The incubation period – the time between exposure and the onset of symptoms – is typically 1 to 4 weeks.

Symptoms

The illness usually develops gradually and may begin with nonspecific complaints. Common symptoms include:

Dry, persistent cough (often the most prominent symptom)
Mild to moderate fever and chills
Sore throat and hoarseness
Headache and muscle aches
General fatigue and malaise
Occasionally: ear infection, skin rash, or neurological symptoms

Most cases follow a mild to moderate course. Severe pneumonia requiring hospitalization is possible but less common.

Diagnosis

Diagnosis of a Mycoplasma pneumoniae infection can be established through several methods:

Blood test (serology): Detection of antibodies against the bacterium; IgM antibodies indicate an acute or recent infection.
PCR test: A throat swab or respiratory sample is analyzed by polymerase chain reaction (PCR) to detect the bacterial DNA – this is the most sensitive diagnostic method.
Chest X-ray: May reveal typical changes consistent with pneumonia, though findings are not specific to this pathogen.

Treatment

Because Mycoplasma pneumoniae has no cell wall, antibiotics such as penicillins or cephalosporins are ineffective. Treatment is instead based on:

Macrolide antibiotics (e.g., azithromycin, clarithromycin): First-line therapy, especially in children.
Tetracyclines (e.g., doxycycline): Effective and commonly used in adults.
Fluoroquinolones (e.g., levofloxacin): Used in adults who cannot tolerate other agents or in cases of macrolide resistance.

In addition to antibiotic therapy, supportive measures are recommended, including adequate fluid intake, physical rest, and fever-reducing medication if needed. Most patients recover fully within a few weeks.

Risk Groups and Complications

School-age children, adolescents, and young adults are most commonly affected. Individuals with weakened immune systems, older adults, and patients with chronic lung conditions such as asthma or COPD are at greater risk of severe disease. Rare but serious complications include inflammation of the heart (myocarditis), the brain (encephalitis), or the joints (reactive arthritis).

References

Waites KB, Talkington DF. Mycoplasma pneumoniae and its role as a human pathogen. Clinical Microbiology Reviews. 2004;17(4):697-728. PubMed PMID: 15489344.
World Health Organization (WHO): Pneumonia Fact Sheet. www.who.int
Atkinson TP, Balish MF, Waites KB. Epidemiology, clinical manifestations, pathogenesis and laboratory detection of Mycoplasma pneumoniae infections. FEMS Microbiology Reviews. 2008;32(6):956-973.

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