[Prevalence of atypical pathogens in adult patients with community-acquired pneumonia in Beijing].
OBJECTIVE
To study the pathogens in community-acquired pneumonia (CAP), especially the prevalence of atypical pathogens.


METHODS
A prospective study was performed on 103 consecutive adult patients with CAP between November 2001 and June 2002. Antibodies of the paired serum samples to Mycoplasma pneumoniae, Legionella pneumophilia, and Chlamydia pneumoniae were detected. The P1 adhesion gene of Mycoplasma pneumoniae and the 16S ribosome gene specific for Chlamydia pneumoniae were detected with polymerase chain reaction (PCR). Legionella antigen in urine was detected using enzyme immunoassay (EIA) method. Sputum samples were collected for culture, and bacteria were isolated and identified using conventional methods.


RESULTS
The etiology of CAP was identified in 50 (48.5%) patients. The distribution of causal agents was as follows: Mycoplasma pneumoniae in 23 (22.3%) cases, Legionella pneumophilia 3 (2.9%), Chlamydia pneumoniae 2 (1.9%), streptococcus pneumoniae 12 (11.7%), Haemophilus influenzae 9 (8.7%), and Klebsiella pneumoniae 7(6.8%). In 6 patients (5.8%) more than one causal agent were found, among them Mycoplasma pneumoniae was found in 5 cases with mixed infections.


CONCLUSIONS
Atypical pathogens especially Mycoplasma pneumoniae have an important role in CAP. Streptococcus pneumoniae and Haemophilus influenzae remain the most common bacteria, and mixed infection should not be ignored.
Liu
You-ning
YN
Department of Respiratory Medicine, The General Hospital of Chinese People's Liberation Army, Beijing 100853, China.
Zhao
Tie-mei
TM
Yao
Wan-zhen
WZ
Zhang
Li-sha
LS
He
Zheng-yi
ZY
Jiao
Yun-min
YM
Duan
Yun-you
YY
Nie
Zhou-shan
ZS
Wang
Rui
R
Liu
Qing-feng
QF
D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000907:Antibodies, Bacterial / Q000097:blood; D000942:Antigens, Bacterial / Q000652:urine; D001419:Bacteria / Q000235:genetics / Q000276:immunology / Q000302:isolation & purification; D002681:China; D017714:Community-Acquired Infections / Q000276:immunology / Q000382:microbiology*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D011014:Pneumonia / Q000276:immunology / Q000382:microbiology*; D016133:Polymerase Chain Reaction
D000907:Antibodies, Bacterial; D000942:Antigens, Bacterial