The lungs can be heard dry and wet rales and croup to be differentially diagnosed with: 1. Chlamydia trachomatis pneumonia: In 1975, someone began to report neonatal chlamydia pneumonia, secondary to inclusion body pus khat. The disease is mostly transmitted by the infected mother can eye infection through the nasolacrimal duct into the respiratory tract. The onset of symptoms is slow and can be preceded by upper respiratory tract infection, mostly without fever or occasionally with low-grade fever, followed by cough and shortness of breath, often with fine wet rales or twanging sounds on inspiration and rarely with expiratory wheezing. The chest radiograph shows extensive bilateral interstitial and alveolar infiltrates, hyperinflation signs are more common, and occasionally large lobar solid changes are seen. Peripheral blood leukocyte counts are generally normal, with eosinophilia. Epithelial cells must be scraped from nasopharyngeal swabs. Direct fluorescent antibody test (DFA) and enzyme immunoassay (EIA) are also available to detect Chlamydia trachomatis antigen in nasopharyngeal specimens. Serological examination of specific antibodies diagnostic criteria for bifurcated serum antibody titer more than 4 times elevated, or IgM>1:32, IgG>1:512. can also apply PCR techniques for direct detection of Chlamydia DNA. 2, Chlamydia psittaci pneumonia: from poultry contact or infected with bird droppings, is an occupational disease of poultry breeding, trafficking and slaughterers. Human-to-human infection is rare. The pathogen is excreted from secretions and excreta and can carry the bacteria for a long time. Chlamydia psittaci enters the body through the respiratory tract, multiplies in mononuclear cells and releases toxins, which are disseminated to the lungs and systemic tissues via the blood stream, causing infiltration of pulmonary phlegm and perivascular cells and enlargement of hilar lymph nodes. The incubation period is 6 to 14 d. The onset of the disease is flu-like, often with a fever of 38 to 40.5°C. The cough is initially dry, followed by sputum, and dyspnea is either mild or severe. There is a relatively slow pulse, myalgia, chest pain, loss of appetite, and occasionally nausea and vomiting.