The detection of Klebsiella pneumoniae virulence gene and antibiotics resistance gene takes a long time and high cost with equipment requirements. Distinguishing the Klebsiella pneumoniae by gene were late for clinical treatment. Therefore, the investigators aim to study the clinical characteristics of critically ill patients with Klebsiella pneumoniae infection which expressed different drug sensitivity test results.

Clinical data of adult patients in integrated ICUs of 6 hospitals of Fujian Province China from January 2015 to July 2019 were collected, who had been examined for sputum, urine, blood, pleural effusion, ascites, cerebrospinal fluid and wound secretions and other body fluid samples. And the results showed that Klebsiella pneumoniae was positive, including demographic data, underlying disease status, drug sensitivity test, infection-related indicators, life support, prognostic indicators.

Inclusion Criteria:

• Adult whose body fluid were sampled during ICU stay and Klebsiella pneumoniae was detected, followed by drug sensitivity test (including reporting the test results after the patient was transferred out of ICU or died).

Exclusion Criteria:

• Age were less than 18 years old;
• Patients stayed in ICU was less than 48 hours.

Adult whose body fluid were sampled during ICU stay and Klebsiella pneumoniae was detected, followed by drug sensitivity test.