<prompt> The commonest cause of Bacterial Pneumonia in children isStreptococcus pyogenesHemophilus influenzaeStreptococcus pneumoniaeStaphylococcus aureus  <response>: Pneumonia Pneumonia is an inflammation of the parenchyma of lungs.Most of the infective pneumonia is caused by bacteria and viruses.Bacterial causesStreptococcus pneumoniae pneumococci is the most common bacterial pathogens followed by chlamydia pneumonia and mycoplasma pneumonia. Nelson 18th e 1795So, the three most common bacterial causes are Pneumococci, Mycoplasma pneumoniae, Chlamydia pneumoniaOther bacteria Streptococcus pyogenes, Staphylococcus aureus, H. influenzae 