Mycoplasma pneumonia is part of the atypical pneumonia subtype which is caused by the bacteria M. pneumoniae. Mycoplasma pneumonia affects individuals younger than 40. It makes up 15 - 50% of all pneumonia cases in adults and especially in school-aged children. People at great risk for mycoplasma pneumonia comprise of those living or working in busy areas such as schools and homeless shelters， although many people who contract mycoplasma pneumonia have no identifiable risk factor. P1， P30， and P116 of mycoplasma pneumonia membrane proteins have been recognized as adhensive factors， P1 is considered as a main adhension protein of the organism colonization.
