ARI (Acute Respiratory Infection) is an acute infectious disease that affects one or more parts of the human respiratory system, starting from the upper respiratory tract (nose) down to the lower respiratory tract (alveoli), including its adnexal tissues such as the sinuses, middle ear cavity, and pleura. Under international medical classification standards, the ICD-10 diagnosis code for ARI is J06.9 (Acute upper respiratory infection, unspecified).

Citing data from the 2023 Indonesian Health Survey (SKI) released by the Ministry of Health of the Republic of Indonesia, the national prevalence of ARI in Indonesia reached 23.5%, with DKI Jakarta Province recording an incidence rate of 22.6%. Furthermore, citing World Health Organization (WHO) data, lower respiratory tract infections remain one of the leading causes of the highest morbidity and mortality globally every year, particularly in developing nations. Transmission of this disease occurs rapidly through exposure to respiratory droplets, airborne aerosol particles, and direct contact with infected individuals.

What Are the Symptoms of ARI in Children and Adults?

Recognizing the symptoms of ARI from an early stage is crucial so that medical intervention can be carried out promptly before the infection spreads to deeper lung tissue. The severity of symptoms is generally influenced by the patient’s immune system resistance and the degree of pathogen virulence.

Clinically, symptom manifestations are categorized by age group:

• ARI symptoms in children: Children and toddlers tend to experience sudden high fever, persistent coughing, nasal congestion that interferes with sleep, irritability, a drastic loss of appetite, and inward chest wall retractions while breathing.
• ARI symptoms in adults: In the productive age group, complaints generally begin with an itchy or sore throat upon swallowing (pharyngitis), a runny nose (rhinorrhea), sneezing, a dry or productive cough, headache, muscle aches, and physical fatigue that can hinder work productivity.

What Are the Characteristics of ARI Based on Severity?

Accurately identifying the characteristics of ARI helps distinguish mild respiratory infections from medical emergencies such as pneumonia.

• Characteristics of ARI in children requiring close observation: Respiratory rate becoming significantly faster than normal limits (tachypnea), audible additional breath sounds such as wheezing or stridor during inhalation, and the appearance of a bluish discoloration around the lips (cyanosis) due to a lack of oxygen supply.
• Characteristics of ARI in adults: Mild to moderate fever, hoarseness or loss of voice (laryngitis), sputum (phlegm) production turning yellowish-green, a feeling of heaviness or pain in the chest area, and a drop in oxygen saturation levels if the infection has reached the lung air sacs (alveoli).

What Are the Causes of ARI and Its Risk Factors?

Medically, the primary cause of ARI is the invasion of pathogenic microorganisms such as viruses (Rhinovirus, Influenza, Adenovirus, Respiratory Syncytial Virus) and bacteria (Streptococcus pneumoniae, Haemophilus influenzae). In addition to these biological agents, ARI is a condition heavily influenced by environmental risk factors and daily behaviors.

• Causes of ARI in children: An immune system that is not yet fully developed, exposure to secondhand cigarette smoke from family members at home (passive smoking), suboptimal nutritional status, and cross-transmission in school or playground environments.
• Causes of ARI in adults: Exposure to air pollution and smoke from forest and land fires, workplace exposure to biological hazards, smoking habits that damage the mucociliary clearance mechanism of the respiratory tract, and reduced immunity due to fatigue.

Citing health research in the Sahombu Multidisciplinary Journal, a family history of the disease has been proven to be the most significant risk factor, increasing ARI transmission by more than double due to the intensity of close contact at home. Beyond domestic factors, physical indoor conditions—such as air temperature and humidity levels that fail to meet Ministry of Health or WHO standards—further increase respiratory vulnerability to microorganism infections. Individual factors such as being over 35 years of age and smoking habits also contribute to declining natural mucosal defense functions in the lungs and overall immunity. Consequently, non-compliance with wearing protective masks in high-risk environments further increases the likelihood of exposure to ARI-triggering droplets and aerosols.

Frequently Asked Questions (FAQ)

1. Is ARI contagious, and what is ARI in children?

Yes, citing guidelines from the Ministry of Health of the Republic of Indonesia, ARI is an infection transmitted rapidly through droplets when an infected person coughs or sneezes, especially in household settings with high interaction frequency. Meanwhile, ARI in children refers to an acute respiratory infection affecting individuals under 18 years of age (especially toddlers), which requires extra monitoring because a child’s airway diameter is narrower and more vulnerable to pneumonia complications.

2. Is ARI dangerous, and what causes ARI?

Regarding whether ARI is dangerous, this condition can have serious and even life-threatening impacts if neglected, as the infection can spread to lower lung tissue and trigger acute respiratory failure. As for what causes ARI, the main triggers are viral or bacterial infections exacerbated by poor indoor air circulation, extreme weather changes during seasonal transitions, exposure to cigarette smoke, and contracting the infection from sick family members.

3. How can ARI be treated effectively?

To answer how to treat ARI effectively, management is tailored to the underlying cause. Because the majority of cases are triggered by viral infections, key measures include total adequate rest, increasing warm water intake to help thin mucus (phlegm), taking symptomatic medication (such as fever reducers or cough suppressants), and meeting daily nutritional needs. Antibiotics should only be administered under a doctor’s prescription when a secondary bacterial infection is proven.

Conclusion

Understanding that ARI is a highly contagious respiratory infection demands vigilance in recognizing its symptoms, cause factors, and specific characteristics in both children and adults. Given that household transmission and indoor air conditions heavily influence infection risk, adopting Clean and Healthy Living Behaviors (PHBS), maintaining optimal air ventilation, and practicing disciplined mask usage when interacting with sick individuals represent the best protective measures to break the chain of ARI transmission.

References:

• World Health Organization (WHO): Guidelines for Indoor Air Quality: Dampness and Mould & WHO Pneumonia Fact Sheet.
• Jurnal Multidisiplin Sahombu (Astuti et al., 2026): Factors Associated with the Incidence of Acute Respiratory Infections Among Employees at Tanjung Priok Regional General Hospital in 2025.
• Badan Kebijakan Pembangunan Kesehatan (BKPK) Kementerian Kesehatan RI: Laporan Survei Kesehatan Indonesia (SKI) 2023.
• Pusat Krisis Kesehatan Kementerian Kesehatan RI: Mengenal Penyakit Saat Musim Pancaroba.