ROGER HARRIS / SCIENCE PHOTO LIBRARY ROGER HARRIS / SCIENCE PHOTO LIBRARY
Bacteria in a lung. Computer artwork of bacteria (yellow) on cilia (hair-like structures) in a lung. Bacterial infection of the lungs can cause potentially fatal pneumonia. Many types of bacteria are found in the respiratory tract in healthy humans, but if the immune system is damaged they may become pathogenic. One of the most common types of bacterium found in this kind of infection is Streptococcus pneumoniae.
Model release not required. Property release not required.