<prompt> Pneumatocele is caused by?Staphylococcus aureusStreptococcus pyogenesHemophilus parainfluenzaeMycoplasma pneumoniae  <response>: Ans. A. Staphylococcus aureus S. aureus is a cause of serious respiratory tract infections in newborns and infants; these infections present as shortness of breath, fever, and respiratory failure. Chest X-ray may reveal pneumatocele shaggy, thin- walled cavities. Pneumothorax and empyema are recognized complications of this infection. 