Pneumococcal infection is a bacterial infection caused by *Streptococcus pneumoniae*. It can lead to a range of illnesses, from mild ear infections to severe conditions like pneumonia, meningitis, and sepsis. It primarily affects young children, older adults, and individuals with weakened immune systems.
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The bacterium *Streptococcus pneumoniae* was independently discovered in 1881 by Louis Pasteur and George Sternberg. It was quickly identified as a major cause of pneumonia and other serious diseases, prompting significant research into its pathology and leading to the development of effective vaccines in the 20th century.
Pneumococcal infection spreads from person to person primarily through respiratory droplets. This occurs when an infected individual coughs or sneezes, releasing bacteria into the air that can then be inhaled by others. The bacteria can also be carried in the nose and throat of healthy individuals without causing illness, who can then transmit it to vulnerable people.
Contagious Period: Varies by disease
Local health department information and state-specific prevention guidance
Our AI-powered surveillance continuously monitors pneumococcal infection activity across Massachusetts. We track data from state health departments, local hospitals, CDC reports, and 50+ global health sources to provide early warning of emerging threats.
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For official state health alerts, vaccination locations, and public health guidance specific to Massachusetts, visit your state health department's website.
Whether you live in Massachusetts or are traveling there, knowing the symptoms, timeline, and when to seek care helps you act quickly if exposure occurs.
Seek care if you experience severe dehydration, bloody stools, high fever, or symptoms lasting more than 3 days. Children under 5, adults over 65, and immunocompromised individuals should seek care earlier.
Emergency symptoms: Severe dehydration, inability to keep fluids down for 12 or more hours, or neurological symptoms require emergency care.
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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: 2026-07-18
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