The last known case occurred in Somalia in 1977. Read more
Streptococcus pneumoniae bacteria, also called pneumococcal bacteria, are one of the leading causes of illness in young children. They can cause pneumonia, bloodstream infections, meningitis, sinusitis, and middle ear infection.
A vaccine is a medical intervention, and as with any medical intervention, may have side effects. This article discusses side effects and adverse events related to vaccination.
Vaccines are made using several different processes. They may contain live viruses that have been attenuated (weakened or altered so as not to cause illness); inactivated or killed organisms or viruses; inactivated toxins (for bacterial diseases where toxins generated by the bacteria, and not the bacteria themselves, cause illness); or merely segments of the pathogen (this includes both subunit and conjugate vaccines).
The human immune system is essential for our survival in a world full of potentially dangerous microbes.