Boktor Sameh W., Hafner John W., Doerr Chaddie
Penn State College of Medicine
Univ of Illinois at Chicago - Peoria
Influenza is a communicable viral disease that affects the upper and lower respiratory tract. A wide spectrum of influenza viruses causes it. Some of these viruses can infect humans, and some are specific to different species. These viruses are transmissible through respiratory droplets expelled from the mouth and respiratory system during coughing, talking, and sneezing. The influenza viruses can be transmitted by touching inanimate objects soiled with the virus and touching the nose or eye. Influenza can be transmitted before the patient is symptomatic and until 5 to 7 days after infection. After infection, it takes a few days for most of the healthy patients to recover fully, but complications that include pneumonia and death are common in certain high-risk groups. These groups include young children, the elderly, immunocompromised, and pregnant females. Symptoms of influenza include a runny nose, high fever, cough, and sore throat. Influenza spreads rapidly and efficiently in seasonal epidemics. Flu epidemics occur every autumn and winter in temperate regions and affect a significant portion of adults and children, but seasons differently impact age groups and severity.
流感是一种影响上、下呼吸道的传染性病毒性疾病。多种流感病毒可引发该病。其中一些病毒可感染人类,还有一些则特定感染不同物种。这些病毒可通过咳嗽、交谈和打喷嚏时从口腔及呼吸系统排出的呼吸道飞沫传播。流感病毒也可通过接触被病毒污染的无生命物体,然后触摸鼻子或眼睛而传播。流感在患者出现症状之前以及感染后5至7天内均可传播。感染后,大多数健康患者需要几天时间才能完全康复,但某些高危人群中常见包括肺炎和死亡在内的并发症。这些人群包括幼儿、老年人、免疫功能低下者和孕妇。流感症状包括流鼻涕、高烧、咳嗽和喉咙痛。流感在季节性流行中传播迅速且高效。在温带地区,每年秋冬都会发生流感流行,影响相当一部分成年人和儿童,但不同季节对不同年龄组和严重程度的影响有所不同。