It may not be the number one killer disease.. but it ranks first on morbidity and ranks 5th on mortality. Pneumucoccal Disease is a SERIOUS disease. Pneumococcal disease is caused by the bacterium Streptococcus pneumoniae (S. pneumoniae), also known as pneumococcus. The bacteria may cause ear infection, pneumonia, meningitis or sepsis. Young children and the elderly are more prone…









