Bacterial pneumonia is most commonly caused by a bacteria called Streptococcus pneumoniae which accounts for around 50% of cases. Other common causes include Haemophilus influenzae, Chlamydia ...

pestis. He probably contracted the Hib infection first, Guellil and colleagues say. While respiratory infections rarely leave marks, the boy’s kneecaps had fused to the thighbones above them.

The Hib vaccine protects children against infections like meningitis and pneumonia that are caused by the Haemophilus influenzae type b bacterium.

So, babies get a pneumococcal vaccine, which helps protect against pneumococcal pneumonia. They also get a Hib vaccine, which helps protecting, and it's another type of bacterial pneumonia.

Haemophilus influenzae is a bacterium that can trigger severe respiratory infections, including pneumonia, meningitis, and epiglottitis.