Norwalk Virus As the summer season is in full gear now a particular virus is looming in the horizon. This virus is an important cause of acute gastroenteritis in humans and is the most frequently implicated cause of outbreaks of viral gastroenteritis worldwide. Noroviruses are a group of single-stranded RNA viruses in the family Caliciviridae that cause acute gastroenteritis in humans.(1) Norwalk virus is the prototypical strain in the genus. Noroviruses cause an estimated
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characteristics are used to place each virus in a specific group? The three characteristics that are used to place each virus include the virus’ combination of their nucleic acid‚ strandedness (whether it’s single-stranded
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among viruses. 2. A microbiologist analyzes chemicals obtained from an enveloped RNA virus that infects monkeys. He finds that the viral envelope contains a protein characteristic of monkey cells. Which of the following is the most likely explanation? ( Concept 19.1) Your Answer: | Its presence is a result of the monkey’s immunological response. | | Correct Answer: | The viral envelope forms as the virus leaves the host cell. | | No. This does not explain the presence of either the envelope
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Communicable Disease Michael E Aponte Professor Steiner University of Phoenix HCS 457 Chickenpox is a highly communicable virus named the varicella-zoster virus and closely resembles the herpes virus. The virus can be released into the air by coughing or sneezing‚ spreading the virus from person to person. The virus also can be spread by touching the fluids from a chickenpox blister. Chickenpox is so contagious that an individual who has never had exposure to chickenpox has an 80%
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is spreading in poultry in Egypt and Asia. The virus is deadly to birds‚ as well as any mammal or human who come in contact with the birds. The first case of H5N1 in humans was reported to be in Hong Kong in 1997‚ and the virus has reemerged in 2003/2004 in Asia‚ Europe and Africa. Nearly 60 percent of the people with the virus has died since. Compared to other types of influenza‚ the bird flu does not spread as easily from human to human. The virus spreads between humans if an infected person is
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(homeostasis). copyright cmassengale 2 What are Viruses? A virus is a noncellular particle made up of genetic material and protein that can invade living cells. copyright cmassengale 3 Viral History copyright cmassengale 4 Discovery of Viruses Beijerinck (1897) coined the Latin name “virus” meaning poison He studied filtered plant juices & found they caused healthy plants to become sick copyright cmassengale 5 Tobacco Mosaic Virus Wendell Stanley (1935) crystallized sap from sick tobacco
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1. understand the causes of infection 1.1 bacteria - neither plant/animal. are a group of there own. very small‚ normally millions of them. multiply ++. single cell with NO nucleus Virus - small infectious agent‚ can only replicate inside living cells of organism‚ have genes of DNA or RNA Fungi - multicellular micro organisms including yeasts & moulds. used for making ABx. essential in decomposition Parasite- is an organism that lives on or in another organism to the detremenet of the host
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that affect mostly other birds‚ but few can be transmitted to humans. The most prevalent avian influenza virus in humans is the highly pathogenic Avian Influenza A (H5N1) virus‚ which has caused over 380 confirmed cases in 15 countries (Rabinowitz‚ 2010). Majority of cases have been transmitted via bird-to-human‚ with rare cases of human-to-human transmission. Continued exposure to the virus not only poses the threat of ongoing morbidity and mortality‚ but also the threat of H5N1 being able to adapt
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infected by AIDS in the past 30 year extensive research has been done in the medical field in order to combat this virus. AZT chemical name 3’-azido-3’-deoxythymidine‚ is an anti AIDS drug which is works by inhibiting the reverse transcription process (Adlam‚ 2013). The further understanding of how AZT works is crucial in order to find out exactly what it does to our bodies and the virus HIV’s ability to develop resistance to this anti HIV drug. 3’-azido-3’-deoxythymidine has been used as an anti
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Virus Multiple Choice Identify the choice that best completes the statement or answers the question. ____ 1. Which of the following statements is INCORRECT? a. Viruses are not able to move by themselves. b. Viruses are not able to reproduce by themselves. c. Viruses are not structurally organized. d. Viruses are nonliving particles. e. Viruses contain instructions to manufacture themselves. ____ 2. Which of the following is FALSE? a. The outer coats of all viruses are alike. b. The
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