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Chapter 14 & 15 Slide

Chapter 14 & 15 Slide - BIO 205 Chapter 14 and...

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Unformatted text preview: BIO 205 Chapter 14 and Chapter 15 Influenza Virus • Influenza Is a Highly Communicable Acute Respiratory Infection – It is transmitted by airborne respiratory droplets – There have been at least 31 influenza pandemics since 1510 – The virion belongs to the Orthomyxoviridae family – Influenza contains two types of spikes: • Hemagglutin (H) helps the virion attach and penetrate host cells • Neuraminidase (N) helps release virions from the host cell after replication and assembly The Structure of Influenza Virus – Influenza A strikes every year and causes most epidemics – Influenza B also strikes every year but is less common than type A – Influenza C causes a mild respiratory illness but not epidemics – A new flu strain evolves every year, requiring development of a new vaccine – Complications such as pneumonia or secondary infections occur in: • Infants • Elderly • Immunocompromised people – Guillain-Barré syndrome occurs when the body damages its own peripheral nerve cells – Reye syndrome often occurs in children who take aspirin to treat pain and fever Map of confirmed human cases of H5N1 Avian influenza (July 7, 2006) The major influenza pandemics were the result of antigenic shifts HIV Virus •...
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Chapter 14 & 15 Slide - BIO 205 Chapter 14 and...

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