ستربتوكوكوس pneumoniae is a type of bacteria that can cause pneumonia, an infection of the lungs. It is a common cause of respiratory infections and can lead to serious health issues, especially in young children, the elderly, and individuals with weakened immune systems. The bacteria are typically spread through respiratory droplets when an infected person coughs or sneezes. In addition to pneumonia, ستربتوكوكوس pneumoniae can also cause other illnesses, such as meningitis and sinusitis. Vaccines are available to help protect against some strains of this bacteria, making vaccination an important public health measure to reduce the incidence of these infections.