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ARI – Acute Respiratory Infection Explained

ARI (Acute Respiratory Infection) refers to sudden-onset infections of the airways. Common symptoms include cough, runny nose, sore throat, and fever.

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ARI (Acute Respiratory Infection) refers to sudden-onset infections of the airways. Common symptoms include cough, runny nose, sore throat, and fever.

What is an ARI (Acute Respiratory Infection)?

ARI stands for Acute Respiratory Infection and describes a broad group of infectious diseases affecting the upper or lower respiratory tract. These include the common cold, influenza, bronchitis, and pneumonia. ARI are among the most prevalent illnesses worldwide and affect people of all ages, with the highest burden seen in young children and the elderly.

Causes

The majority of ARI are caused by viruses. The most common pathogens include:

Rhinoviruses (the leading cause of the common cold)
Influenza viruses (seasonal flu)
Coronaviruses (including SARS-CoV-2)
Respiratory Syncytial Virus (RSV) (particularly dangerous for infants and the elderly)
Adenoviruses and parainfluenza viruses

Bacterial causes are less common but include Streptococcus pyogenes (strep throat) and Mycoplasma pneumoniae. Transmission typically occurs via droplet infection (coughing, sneezing) or contact transmission (touching contaminated surfaces and then touching the face).

Symptoms

Symptoms of an ARI vary depending on whether the upper or lower respiratory tract is affected:

Upper Respiratory Tract

Runny or blocked nose (rhinitis)
Sore throat and difficulty swallowing
Hoarseness
Ear pain
Sinusitis (inflammation of the sinuses)

Lower Respiratory Tract

Cough (dry or productive with phlegm)
Bronchitis
Shortness of breath
Pneumonia in severe cases

General symptoms such as fever, fatigue, headache, and muscle aches frequently accompany ARI, especially in influenza and more severe infections.

Diagnosis

ARI are primarily diagnosed clinically, based on the patient's reported symptoms and a physical examination. Additional tests may include:

Throat swabs to detect bacteria (e.g., Streptococcus) or viruses
Rapid antigen tests (e.g., for influenza or COVID-19)
Blood tests to help distinguish between viral and bacterial infection
Chest X-ray if pneumonia is suspected

Treatment

Treatment of ARI depends on the causative pathogen and severity of the illness.

Viral ARI

As most ARI are viral, treatment is primarily symptomatic:

Rest and adequate fluid intake
Decongestant nasal sprays for nasal congestion
Pain and fever relievers (e.g., ibuprofen or paracetamol)
Saline inhalations to soothe mucous membranes

Bacterial ARI

When a bacterial infection is confirmed or strongly suspected, antibiotics are prescribed -- for example, in cases of streptococcal pharyngitis or bacterial pneumonia. Antibiotics have no effect against viruses and should only be used when clearly indicated.

Severe Cases

Hospitalization may be required for severe pneumonia or in high-risk groups such as infants, elderly individuals, or immunocompromised patients.

Prevention

Several measures are effective in reducing the risk of ARI:

Regular and thorough handwashing
Vaccination against influenza, COVID-19, pneumococcal disease, and RSV (for eligible risk groups)
Coughing and sneezing into the elbow
Maintaining distance from sick individuals
Regular ventilation of indoor spaces

References

World Health Organization (WHO): Acute Respiratory Infections. WHO Fact Sheets. Geneva, current edition. Available at: www.who.int
Robert Koch Institute (RKI): Acute Respiratory Diseases -- Epidemiological Bulletin. Berlin, current edition. Available at: www.rki.de
Mandell GL, Bennett JE, Dolin R.: Mandell, Douglas, and Bennett's Principles and Practice of Infectious Diseases. Elsevier, current edition.

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