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Influenza-like illness (ILI), also known as flu-like syndrome or flu-like symptoms, is a medical diagnosis of possible influenza or other illness causing a set of common symptoms. These include fever, shivering , chills , malaise , dry cough , loss of appetite , body aches, nausea , and sneezing typically in connection with a sudden onset of ...
Another flu pandemic occurred in 1781–1782, starting in China in autumn. [68] From this pandemic, influenza became associated with sudden outbreaks of febrile illness. [77] The next flu pandemic was from 1830 to 1833, beginning in China in winter. This pandemic had a high attack rate, but the mortality rate was low. [34] [68]
SARS produces flu-like symptoms which may include fever, muscle pain, lethargy, cough, sore throat, and other nonspecific symptoms. SARS often leads to shortness of breath and pneumonia , which may be direct viral pneumonia or secondary bacterial pneumonia .
The 1889–1890 pandemic, often referred to as the Asiatic flu [53] or Russian flu, killed about 1 million people [54] [55] out of a world population of about 1.5 billion. It was long believed to be caused by an influenza A subtype (most often H2N2), but recent analysis largely brought on by the 2002-2004 SARS outbreak and the COVID-19 pandemic ...
[11] [12] Pandemics and their ends are not well-defined, and whether or not one has ended differs according to the definition used. [11] [13] As of 21 January 2025, COVID-19 has caused 7,083,233 [5] confirmed deaths, and 18.2 to 33.5 million estimated deaths. [7] The COVID-19 pandemic ranks as the fifth-deadliest pandemic or epidemic in history.
PAIS symptoms are often non-specific and similar despite diverse prior infections. Symptoms commonly included in definitions of PAIS include post-exertional malaise, severe fatigue, neurocognitive and sensory symptoms, flu-like symptoms, unrefreshing sleep, muscle pain, and joint pain. Symptoms can vary among affected people. [1]
Flu season is an annually recurring time period characterized by the prevalence of an outbreak of influenza (flu). The season occurs during the cold half of the year in each hemisphere. It takes approximately two days to show symptoms. Influenza activity can sometimes be predicted and even tracked geographically.
Structural view of a coronavirus. Coronavirus diseases are caused by viruses in the coronavirus subfamily, a group of related RNA viruses that cause diseases in mammals and birds.