Original Article
Analysis of influenza epidemic in a surveillance sentinel hospital in northwest region in winter of 2017-2018
Jiaolin Sun, Hanhan Liu, Lin Zhang, Kaikai Huo, Wenna Zhang, Yawen Wang, Zhihong Shi
Published 2019-01-05
Cite as Int J Respir, 2019, 39(1): 41-45. DOI: 10.3760/cma.j.issn.1673-436X.2019.01.009
Abstract
ObjectiveTo analyze the characteristics of influenza (Flu) in northwest region from November 2017 to February 2018 for providing a scientific basis for influenza prevention and control.
MethodsInfluenza-like illness outpatients in the First Affiliated Hospital of Xi′an Jiaotong University from 1st November 2017 to 15th February 2018 were enrolled.Then to get the epidemic trend, age distribution and characteristics of laboratory examinations, patients with influenza screening test positive were analyzed.
ResultsThe peak of the number of outpatients diagnosed with A influenza was from the fifty-second week of 2017 to the third week of 2018.For B influenza, the peak was from the third week to the fifth week of 2018.0~6 years old group was the main population of Flu, 1 051 (positive rate was 42.00%), followed by adults, 494 (positive rate was 22.16%). The old were the least, 85 (positive rate was 6.94%). There showed significant differences in influenza virus antigen detection among all age groups (P<0.01). There showed no gender difference in clinical influenza cases.Compared with B influenza, the patients diagnosed with A influenza had higher leucocyte counts (7.07±0.09)×109/L vs (5.97±0.17)×109/L, higher neutrophilic granulocyte percentage (59.83%±5.00)% vs (52.2%±29.0)% and sensitivity C reactive protein (6.15±0.11) mg/L vs (5.04±0.26) mg/L, with less percentage of lymphocytes (20.00±2.00)% vs (24.32±4.00)%(P<0.01).
ConclusionsThe epidemic types of influenza virus in northwest region performes in a rule of alternative spreading.Adults and preschoolers are the susceptible population.And the patients are often accompanied with an increasement in systemic inflammatory markers.It is necessary to take effective measures to prevent and control human infection with the influenza virus.
Key words:
Influenza, human; Epidemiological factors; Laboratory examination
Contributor Information
Jiaolin Sun
Department of Respiratory and Critical Care Medicine, the First Affiliated Hospital of Xi′an Jiaotong University, Xi′an 215000, China
Hanhan Liu
Department of Respiratory and Critical Care Medicine, the First Affiliated Hospital of Xi′an Jiaotong University, Xi′an 215000, China
Lin Zhang
Department of Laboratory Medicine, the First Affiliated Hospital of Xi′an Jiaotong University, Xi′an 215000, China
Kaikai Huo
Department of Respiratory and Critical Care Medicine, the First Affiliated Hospital of Xi′an Jiaotong University, Xi′an 215000, China
Wenna Zhang
Department of Respiratory and Critical Care Medicine, the First Affiliated Hospital of Xi′an Jiaotong University, Xi′an 215000, China
Yawen Wang
Department of Laboratory Medicine, the First Affiliated Hospital of Xi′an Jiaotong University, Xi′an 215000, China
Zhihong Shi
Department of Respiratory and Critical Care Medicine, the First Affiliated Hospital of Xi′an Jiaotong University, Xi′an 215000, China
