<prompt> All the following cause community acquired pneumonia EXCEPT:StaphylococciMycoplasmaChlamydia pneumoniaStreptococci  <response>: Ans. a StaphylococciRef: Microbiology by Ananthanarayan and Paniker 8th ed. 199-200 Staphylococci causes hospital acquired pneumonia. Community-acquired pneumonia CAP is pneumonia acquired infectiously from normal social contact that is, in the community. CAP is a common illness and can affect people of all ages. It often causes problems like difficulty in breathing, fever, chest pains, and a cough. CAP occurs throughout the world and is a leading cause of illness and death. Causes of CAP include bacteria, viruses, fungi, and parasites. The most important infection in newborns is caused by Streptococcus agaladiae, also known as Group B Streptococcus or GBS. It causes 50 of cases of CAP in the first week of life. Streptococcus pneumoniae is the most common cause of community acquired acute pneumonia in adults. It is the most common cause of lobar pneumoniaCausesIn InfantsIn Adults Group B Streptococcus Streptococcus Pneumoniae Escherichia coli Klebsiella pneumoniae Moraxella catarrhalis and Streptococcus pneumoniae Hemophilus influenza Escherichia coli Klebsiella pneumoniae Influenzai, Paranifluenza and RSV virus 