Expository Essay

The name of this type of an essay speaks for itself. The word expository means involving, or assisting in exposition; explanatory (Collins English Dictionary). Or another source gives such meaning of this word serving to expound, set forth, or explain: expository writing (Random House Kernerman Websters College Dictionary). That implies the purpose of expository essay to expose and explain some subject, person or situation.

Expository Essay Example

Expository essay is simply essay that explains something with facts, rather than opinions. So this type of writing is to explain, inform, or describe things. The essay designed to expound a main idea from the topic in a logical way.

The topic can give you a prompt to essay writing. It can use the following words explain, describe, define, etc. There is no need to form opinion or arguments, just write simple and clear. Nevertheless, an expository essay is not easy writing at all. There need to be an ability of explaining something well. The biggest difficulty of expository essay writing is a lack of any creative possibilities.

The last thing to remember, an important rule about this writing is that there is no rule.

Expository of Influenza Vaccine and Scientists Researches Writing Example

According to the World Health Organization Influenza occurs globally with an annual attack rate estimated at 5%10% in adults and 20%30% in children. The most effective way to prevent the disease and severe outcomes from the illness is a vaccination. It works by training your bodys immune system to both recognize and fight the flu. Therefore, each year the scientists formulate the flu vaccine to protect against the influenza viruses expected during the upcoming season.

There are two influenza (flu) vaccines. The first one, called flu shot, is an inactivated vaccine which contains killed virus and is given by an injection into the muscle. The second is a nasal-spray flu vaccine that contains weakened live viruses. After getting vaccinated, your body needs about two weeks to create the immune response to protect against infection by viruses similar to those in the vaccine. So it is important to get vaccination at the beginning of the flu season.

The formula of the influenza viruses in the seasonal flu vaccine is changed every year according to the recommendations of scientists from the World Health Organization. They predict which strains of flu virus are most likely to appear the next season. It is founded on surveillance-based forecasts about what virus strains are circulating, how they are spreading; and how well current vaccine will protect against newly identified strains in the coming season.

About 130 national influenza centers in 101 countries conduct year-round surveillance for influenza. These laboratories collect virus specimens in their country and perform preliminary analysis. They also send influenza viruses to the five World Health Organization (WHO) Collaborating Centers for Reference and Research on Influenza located in Atlanta, Georgia, USA (Centers for Disease Control and Prevention, CDC); London, United Kingdom (National Institute for Medical Research); Beijing, China (National Institute for Viral Disease Control and Prevention); Tokyo, Japan (National Institute for Infectious Diseases); and Melbourne, Australia (Victoria Infectious Diseases Reference Laboratory) for advanced antigenic and genetic analysis.

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Based on WHO recommendations for inclusion specific influenza viruses in the vaccine each particular country makes their decision for which strains should be used in influenza vaccines licensed in their country. In the United States, the U.S. Food and Drug Administration (FDA) defines which vaccine viruses will be used in U.S.
The commonly used vaccine (trivalent, inactivated influenza vaccine or TIV) covers three strains: one influenza A (H3N2) virus, one seasonal influenza A (H1N1) virus, and one influenza B virus. However, starting with the 2013-2014 Northern hemisphere influenza season, quadrivalent vaccine composition (QIV) has been recommended by WHO with a second influenza B virus in addition. Quadrivalent influenza vaccines are expected to provide wider protection against influenza B virus infections. Even so, influenza remains unpredictable, and sometimes a strain which is not covered in the vaccine can emerge during the flu season.
Influenza viruses mutate seasonally, so the vaccine needs to be updated every year to match the expected strains. To prevent such horrible pandemic that occurred in November 2009 that attacked more than 206 countries and brought over 6,250 deaths. For that reason the World Health Organizations scientists continue their researches every year to prove more effective influenza vaccine for the next season.