Charles Patrick Davis, MD, PhD
Dr. Charles "Pat" Davis, MD, PhD, is a board certified Emergency Medicine doctor who currently practices as a consultant and staff member for hospitals. He has a PhD in Microbiology (UT at Austin), and the MD (Univ. Texas Medical Branch, Galveston). He is a Clinical Professor (retired) in the Division of Emergency Medicine, UT Health Science Center at San Antonio, and has been the Chief of Emergency Medicine at UT Medical Branch and at UTHSCSA with over 250 publications.
Melissa Conrad Stöppler, MD
Melissa Conrad Stöppler, MD, is a U.S. board-certified Anatomic Pathologist with subspecialty training in the fields of Experimental and Molecular Pathology. Dr. Stöppler's educational background includes a BA with Highest Distinction from the University of Virginia and an MD from the University of North Carolina. She completed residency training in Anatomic Pathology at Georgetown University followed by subspecialty fellowship training in molecular diagnostics and experimental pathology.
In this Article
- Flu (influenza, conventional, H1N1, H3N2, and bird flu [H5N1]) facts
- What is flu (influenza)?
- What are the causes of the flu (influenza)?
- What are flu (influenza) symptoms in adults and in children?
- What is the incubation period for the flu?
- How long is the flu contagious, and how long does the flu last?
- How is the flu (influenza) diagnosed?
- How does flu spread?
- What is the key to flu (influenza) prevention?
- Are there any flu shot or nasal spray vaccine side effects in adults or in children?
- How effective is the flu vaccine?
- Why should the flu (influenza) vaccine be taken every year?
- What are some flu treatments an individual can do at home (home remedies)?
- What can people eat when they have the flu?
- When should a person go to the emergency department for the flu?
- Who should receive the flu vaccine, and who has the highest risk factors? When should someone get the flu shot?
- What is the prognosis (outlook) and complications for patients who get the flu?
- What is the bird (avian) flu?
- Do antiviral agents protect people from the flu?
- What medications treat the flu?
- Is it safe to get a flu shot that contains thimerosal?
- Where can people find additional information about the flu?
- Slideshow: Finding Relief for Your Cough
- Pictures of Natural Cold & Flu Remedies - Slideshow
- Pictures of 10 Foods to Eat When You Have the Flu - Slideshow
Who should receive the flu vaccine, and who has the highest risk factors? When should someone get the flu shot?
In the United States, the flu season usually occurs from about November until April. Officials have decided each new flu season will start each year on Oct. 4. Typically, activity is very low until December, and peak activity most often occurs between January and March. Ideally, the conventional flu vaccine should be administered between September and mid-November. It takes about one to two weeks after vaccination for antibodies against influenza to develop and provide protection. The CDC has published a summary list of their current recommendations of who should get the current vaccine:
Summary of CDC influenza vaccination recommendations for 2015-2016
- All people aged ≥6 months should receive influenza vaccine annually. Influenza vaccination should not be delayed to procure a specific vaccine preparation if an appropriate one is already available.
- For healthy children aged 2 through 8 years who have no contraindications or precautions, either LAIV (nasal spray live attenuated vaccine) or IIV (injection vaccine) is an appropriate option. No preference is expressed for LAIV or IIV for any person aged 2 through 49 years for whom either vaccine is appropriate. An age-appropriate formulation of vaccine should be used.
- LAIV should not be used in the following populations:
- People aged <2 years or >49 years;
- People with contraindications listed in the package insert:
- Children aged 2 through 17 years who are receiving aspirin or aspirin-containing products;
- People who have experienced severe allergic reactions to the vaccine or any of its components, or to a previous dose of any influenza vaccine;
- Pregnant women;
- Immunocompromised people (see also "Vaccine Selection and Timing of Vaccination for Immunocompromised People");
- People with a history of egg allergy;
- Children 2-4 years of age who have asthma or who have had a wheezing episode noted in the medical record within the past 12 months, or for whom parents report that a health-care provider stated that they had wheezing or asthma within the last 12 months. For people ≥5 years of age with asthma, recommendations are described in item 4 of this list;
- People who have taken influenza antiviral medications within the previous 48 hours.
- In addition to the groups for whom LAIV is not recommended above, the "Warnings and Precautions" section of the LAIV package insert indicates that people of any age with asthma might be at increased risk for wheezing after administration of LAIV. The package insert also notes that the safety of LAIV in people with other underlying medical conditions that might predispose them to complications after wild-type influenza virus infection (for example, chronic pulmonary, cardiovascular [except isolated hypertension], renal, hepatic, neurologic, hematologic, or metabolic disorders [including diabetes mellitus]) has not been established. These conditions, in addition to asthma in people ≥5 years of age, should be considered precautions for the use of LAIV.
- People who care for severely immunosuppressed people who require a protective environment should not receive LAIV or should avoid contact with such people for seven days after receipt, given the theoretical risk for transmission of the live attenuated vaccine virus to close contacts.
For more information and details too extensive to include here, the following site is recommended: http://www.cdc.gov/flu/professionals/acip/index.htm.
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