Streptococcus Pneumoniae Pathogenesis Causes 60-70% of all bacterial pneumonia Pneumococci produce their disease through their ability to multiply in tissues From the respiratory tract the infection can reach other sites such as sinuses and middle ear. Infections sometimes can spread from the mastoid to the meningitis, and sometimes bacteria enter blood stream, resulting bacteremia Severe complications include meningitis endocarditis, and septic arthritisStreptococcus Pneumoniae Pathogenesis • Causes 60-70% of all bacterial pneumonia • Pneumococci produce their disease through their ability to multiply in tissues. • From the respiratory tract the infection can reach other sites such as sinuses and middle ear. Infections sometimes can spread from the mastoid to the meningitis, and sometimes bacteria enter blood stream, resulting bacteremia. • Severe complications include meningitis, endocarditis, and septic arthritis