17 June 2026
: Case report 
Chlamydia trachomatis Pneumonia in a 50-Day-Old Full-Term Male Infant Associated With Mucus Plugging of the Left Upper Lobe Bronchus and Left Upper Lobe Atelectasis
Challenging differential diagnosis, Rare disease
Yuan Huang
ABCDEF 1, Meixia Huang AB 1, Liqin Ke EF 1, Shuxian Li ABF 1, Xiaofen Tao B 2, Guohong Zhu AEF 1*
DOI: 10.12659/AJCR.953643
Am J Case Rep 2026; 27:e953643
Figure 2 Amplification plot of polymerase chain reaction for Chlamydia trachomatis in sputum. A typical sigmoidal amplification curve was observed with a cycle threshold (Ct) value of 24.84. The assay positivity criterion was defined as a Ct value ≤ 38 accompanied by a typical sigmoidal amplification curve.