Influenza. Puja A. Sehgal, MD Kelsey-Seybold Clinic. Seasonal Flu. Influenza (Flu) is an acute respiratory illness caused by Influenza A or B viruses that occurs in outbreaks or epidemics worldwide, mainly in winter season.
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Puja A. Sehgal, MD
Symptoms start one to four days after the virus enters the body .
Some persons can be infected with the flu virus but have no symptoms
Anyone Can Get the Flu, But the Disease Is More Severe for Some PeopleThe Flu Is Contagious
H1N1 is a new influenza virus, first detected in the United States in April 2009.
This virus was originally referred to as “swine flu” because laboratory testing showed that many of the genes in this new virus were very similar to influenza viruses that normally occur in pigs (swine) in North America .
This is, in fact, a "quadruple reassortant" virus. It has two genes from flu viruses that normally circulate in pigs and bird (avian) genes and human genes. It has two genes from flu viruses that normally circulate in pigs in Europe and Asia and bird (avian) genes and human genes.
Fast breathing or trouble breathing
Bluish skin color
Not drinking enough fluids
Not waking up or not interacting
Flu-like symptoms improve but then RETURN WITH WORSENING FEVER AND COUGH
Fever with a rash
Difficulty breathing or shortness of breath
Pain or pressure in the chest or abdomen
Severe or persistent vomiting“Emergency warning signs”
Seasonal flu vaccine is not expected to protect against the 2009 H1N1 flu.
People who are allergic to eggs might be at risk for allergic reactions from receiving influenza vaccines, including the 2009 H1N1 vaccine.2009 H1N1 Influenza Vaccine