Invasive pneumococcal disease (IPD) is a serious bacterial infection caused by Streptococcus pneumoniae. It can manifest as life-threatening conditions like meningitis, bacteremia (blood infection), and severe pneumonia. While it can affect anyone, young children, older adults, and individuals with weakened immune systems are most vulnerable.
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*Streptococcus pneumoniae* was first identified in the late 19th century, leading to a crucial understanding of bacterial causes of pneumonia. The development of effective pneumococcal vaccines in the 20th century marked a significant public health achievement, dramatically reducing the global burden of this severe disease.
IPD spreads through respiratory droplets when an infected person coughs or sneezes. It can also be transmitted through close contact with someone carrying the bacteria in their nose or throat, even if they show no symptoms themselves. Many people carry the bacteria without falling ill, allowing for silent spread.
Contagious Period: Varies by disease
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A new study reveals the specific mechanism by which invasive pneumococcal disease can lead to chronic heart damage. Researchers identified S100A8/9-NLRP3-mediated chronic inflammation as a driver of cardiac pathologies following the infection. This discovery offers crucial insight into severe complications of a widespread infectious disease.
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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: 2026-06-03
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