Lower Respiratory Tract Infection (LRTI) is an infection affecting the airways and lungs below the voice box, including the bronchi and alveoli. It is most commonly caused by viruses (e.g., influenza, RSV) or bacteria (e.g., *Streptococcus pneumoniae*), but can also be caused by fungi or parasites. LRTI affects individuals of all ages, but is particularly severe in young children, the elderly, and those with weakened immune systems, being a leading cause of global morbidity and mortality.
Transmission methods vary. Please consult CDC or WHO resources for specific information.
Contagious Period: Varies by disease
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Our AI-powered surveillance hasn't detected significant Lower Respiratory Tract Infection activity in the past 30 days.
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Currently, Lower Respiratory Tract Infection case counts are within baseline expectations globally. However, diseases can emerge rapidly, which is why continuous monitoring is critical.
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Trusted information from leading health organizations
Global disease surveillance and guidelines from the World Health Organization
View WHO Resources →Disease information on Virus Watcher is reviewed by our Chief Epidemiologist, a former CDC lead analyst for FluSight forecasting. Outbreak data is aggregated from verified sources including BEACON, ProMED, WHO, CDC, and 50+ national health agencies. This information is for educational purposes and should not replace professional medical advice.
Last reviewed: 2026-03-05
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