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New flu viruses develop most often in Asia and then circulate throughout the rest of the world. For the Northern Hemisphere in the western regions, the scientists and epidemiologists look to Asia to see what types of flu are circulating during their flu season as these will be the most likely to be circulating elsewhere in the world that year.
The vaccines are either trivalent or quadrivalent (i.e., contain three or four kinds of flu viruses) and are made with those flu viruses selected by the scientists as most likely, utilizing various criteria for selection.
The types and strains finally chosen to be included in the annual vaccines are chosen by collaboration between the CDC, WHO, and the disease control and prevention agencies in other nations. These infectious disease specialists not only select the type of viruses needed to be included that year, but also help isolate, grow and select the specific strains that are more easily grown, closest to the types found circulating in Asia, and able to be used in creation of vaccines.
The vaccines are developed by pharmaceutical companies who get the seed stock of viruses for use in the vaccines from the epidemiologists, (in the US from the CDC). The only thing that is changed each year is the specific group of viruses included, the rest of the vaccine is made the same each year and has been for decades.
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What does Influenza look like?
To view what the influenza virus looks like, you can go here: http://en.wikipedia.org/wiki/Image:EM_of_influenza_virus.jpg
How do you use the word influenza in a sentence?
This is the correct word that is usually abbreviated as "flu." Here are some sentences.The influenza epidemic left many dead and thousands weakened.I have had my influenza vaccine.She caught influenza and was sick for a whole week.
Can scientists predict when an earthquake will happen?
Nope - there is currently no scientific method for predicting earthquakes.
Is predict an adverb?
Predict is a "verb". Here's a sentence for your enjoyment: I predict that Miss Carol Schultz and Mr Jim Harrington, of Voorhees, will marry soon."
Is H influenza the same as Hinfluenzae?
hi what is nflueanza or what ever you said. and here is the answer to your question: yes no
What will be the price of gold in one year?
No one here can predict the future.
Why do scientist search for explanation of phenomena?
Scientists search for explanations of phenomena to understand the natural world, predict future events, and improve technologies. By uncovering the underlying causes of observed phenomena, scientists can make advancements in various fields and contribute to the overall knowledge and progress of society.
Why do scientists go to Antarctica to do research?
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Where can you find pictures of scientists with their inventions?
Here is a video of scientists with their inventions: https://www.youtube.com/watch?v=yZQipjHUGyQ
At what point will scientists gain confidence in a new hypothesis?
At what point will scientists gain confidence in a new hypothesisType your answer here...
How would you use variable in a sentence?
The wind around here is extremely variable - you can never predict it.
What does sporadic mean for flu season?
When diseases are described as sporadic in medical contexts it means that the disease is occurring in single cases here and there and scattered groups of cases. For the flu it can indicate the beginning of an epidemic before cases are widespread or it can be describing when the cases are slowing down and the flu is beginning to have run its course and the epidemic may be coming to an end. Since influenza viruses tend to spread in multiple outbreaks (in "waves"), it may also indicate that at least that particular wave of the outbreak is in the final stages.This term has a specific definition from the Centers for Disease Control and Prevention (CDC) for use in their "Influenza Like Illness" (ILI) surveillance reports. Definitions from the CDC are provided below. See the related links section below for a link to the full information from CDC on how the weeky surveillance reports of ILI are developed, etc.From the CDC:Summary of the Geographic Spread of Influenza - State health departments report the estimated level of spread of influenza activity in their states each week through the State and Territorial Epidemiologists Reports. States report influenza activity as no activity, sporadic, local, regional, or widespread. These levels are defined as follows:No Activity: No laboratory-confirmed cases of influenza and no reported increase in the number of cases of ILI.Sporadic: Small numbers of laboratory-confirmed influenza cases or a single laboratory-confirmed influenza outbreak has been reported, but there is no increase in cases of ILI.Local: Outbreaks of influenza or increases in ILI cases and recent laboratory-confirmed influenza in a single region of the state.Regional:Outbreaks of influenza or increases in ILI and recent laboratory confirmed influenza in at least two but less than half the regions of the state with recent laboratory evidence of influenza in those regions.Widespread:Outbreaks of influenza or increases in ILI cases and recent laboratory-confirmed influenza in at least half the regions of the state with recent laboratory evidence of influenza in the state.
