Strains of all subtypes of influenza a virus have been isolated from wild birds, although disease is uncommon. Influenza in birds is often referred to as avian influenza, in pigs as swine influenza, in horses as equine influenza and so on. Images, photos, and illustrations of influenza viruses and related topics cdc. Swine influenza also called pig influenza, swine flu, hog flu and pig flu is an infection by any one of several types of swine influenza virus siv or soiv swineorigin influenza. Human influenza viruses belong to the orthomyxoviridae family, which consists of the genera influenza a, b, and c virus, thogotovirus carried by ticks, and infecting humans, and isavirus infecting fish, as well as of a few other, newly described arboviruses. Office theme evolution of influenza a influenza a slide 3 why has influenza been such an effective virus. Influenza a viruses are classified into different strains or subtypes based on two proteins or antigens on the virus surface. The global influenza programme gip provides member states with strategic. Influenza virus on vimeo the highquality home for video. The influenza viruses that commonly affect humans are divided into two types, influenza a and influenza b. However, a circulating animal influenza virus subtype poses a substantial risk of human disease. Limited vaccine availability and the potential for resistance to antiviral medications have led to calls for establishing the efficacy of nonpharmaceutical measures for mitigating pandemic influenza. Inhibitory effects of silver nanoparticles on h1n1.
May 11, 2009 the h1n1 virus that caused that pandemic is now a regular human flu virus and continues to circulate seasonally worldwide. A key step in drug discovery is screening to evaluate antiviral activity. Influenza harrisons principles of internal medicine, 20e. Influenza virus levels in nasal washes and lung homogenates were determined by tcid 50 assay. Seasonal influenza ah3n2 activity and antiviral treatment. The english language content on this website is being archived for historic and reference purposes only. Human parainfluenza viruses hpivs have been associated with every type of upper and lower respiratory tract illness, including common cold with fever, laryngotracheobronchitis croup, bronchiolitis, and pneumonia.
Demonstrates regions in iowa w here influenza virus is circulating. Influenza in children ranges from subclinical illness to complicated disease that affects multiple organs. Our objective was to examine if the use of face masks and hand hygiene reduced rates of influenzalike illness ili and laboratoryconfirmed influenza in the natural setting. Webster, phd division of virology department of infectious diseases st. The secure food supply plans for poultry, milk, pork and beef were developed to aid producers, transporters and food processors in the event of a foreign animal disease outbreak, like high pathogenicity avian influenza hpai. Even during a socalled regular flu season, every year the influenza virus causes a lot of damage. In the active form, shown here from pdb entry 1ruz, hemagglutinin is composed of two different types of chains, shown in blue and orange. Generally, diseases outlined within the icd10 codes j09j11 should be included in this category subcategories. Your browser does not currently recognize any of the video formats available. Influenza a h1n1 influenza a h1n1 virus is a subtype of influenza a virus and was the most common cause of human influenza flu in 2009. For example the influenza a virus is transmitted through infected aerosols during coughing and sneezing, which allows the virus direct access to the respiratory tract where its target cells are located. Influenza diagnosis clinical and epidemiological characteristics increase of febrile respiratory illness lab isolation of influenza virus from clinical specimen e. Influenza causes, symptoms, diagnosis, treatment, pathology.
Download free virus powerpoint templates and slide designs containing images of virus or representations of popular virus. The h1n1 virus that caused that pandemic is now a regular human flu virus and continues to circulate seasonally worldwide. Type a influenza is a contagious viral infection that can have lifethreatening complications if left untreated. For current, updated information on seasonal flu, including information about h1n1, see the cdc seasonal flu website. Influenza a virus host range ducks and shorebirds waders families charadriidae and scolopaeidae are the major reservoirs of influenza viruses. The orthomyxoviridae influenza viruses are a major determinant of morbidity and mortality caused by. Download as ppt, pdf, txt or read online from scribd. However, the effects of silver nanoparticles against h1n1 influenza a virus remain unexplored. Hemagglutinin is one of the reasons that influenza virus is so effective. This template provides guidance to assist organizations in developing a pandemic influenza continuity of operations plan or, if the organization already has a continuity plan, a pandemic influenza annex. How cdc is using advanced molecular detection technology to better fight flu.
Animation of the mechanism of an influenza virus and how crucells antibodies target the ha1 proteins on the virus and prevent further spread. Introduction influenza, commonly referred to as the flu, is an infectious viral disease caused by rna viruses of the family orthomyxoviridae the influenza viruses, that affects birds and mammals. Although influenza type b viruses can cause human epidemics, they have not caused. H1n1, h3n2 and h1n2 are the most common influenza subtypes in swine, of which avianlike h1n1 is most frequent. Influenza viruses change easily and often, they are unpredictable, and they can be deadly. So we group influenza viruses like this because of the differences that they have in their genetic material or their genome. Dec 21, 2018 type a influenza is a contagious viral infection that can have lifethreatening complications if left untreated. How cdc is using advanced molecular detection technology. An influenza virus subtype that has caused human infection may be present in animals. The united states government has declared a public health emergency in the u.
These symptoms typically begin two days after exposure to the virus and most last less than a week. Hemagglutinin influenza virus surface glycoprotein, cylinder shaped, consists of 549 amino acids. Influenza chapter 4 2020 yellow book travelers health. Human and avian influenza viruses both replicate efficiently in the respiratory tract of ferrets, and numerous clinical signs found in humans following seasonal or avian influenza virus infection are also present in the ferrets. Influenza a and b virus infections in children clinical. Influenza disebabkan oleh virus orthoneovirus gejalanya adalah demam, sakit kepala, nafsu makan menurun, nyeri otot, biasanya akan sembuh sendiri dalam 37 hari. It mostly aects the breathing system but may also a ect the whole body. Influenza free download as powerpoint presentation. Pay once and download as many of our powerpoint templates, animations and clipart images as you need.
Summary the centers for disease control and prevention cdc is providing. Preclinical and clinical demonstration of immunogenicity by. Best powerpoint templates download your favorites today. What is influenza influenza, commonly known as the flu, is an infectious disease caused by an influenza virus.
Preclinical and clinical demonstration of immunogenicity. Our powerful online video maker is included in our subscrption. Some isolates of influenza a virus cause severe disease both in domestic poultry and, rarely, in humans. Orthomyxoviruses influenza viruses jawetz, melnick. Arthur chunchieh shih et al slide 6 transition time walter fitch and colleagues why did some lineages survive while others perished. Influenzas one of the most common infectious diseases, and is caused the influenza virus. This is influenza virus by bloomfield township on vimeo, the home for high quality videos and the people who love them. For example, under this category you can find free powerpoint templates on corona virus presentations or covid19 powerpoint templates containing multiple colors and cover images. Slides can be adapted for lay audience or for healthcare audience.
Flu is a top 10 killer in the united states, and it leads to approximately 200,000 hospitalizations every year due to complications of the influenza virus. Facemasks, hand hygiene, and influenza among young adults. Influenza a symptoms can be confused with signs of other conditions but are usually. Influenza virus outbreaks occur with regularity, but the severity of outbreaks is not consistent. Only influenza a and b viruses cause epidemics in human beings. There are no additional fees or limits to the number or type of videos you can make with slideclips. Influenza b dont cause pandemics due to limited host range. B viruses can cause some morbidity and mortality among humans, but in general are associated with less severe epidemics \ than influenza a viruses. A high fever, runny nose, sore throat, muscle pains, headache, coughing, and feeling tired.
Objectives learn about pandemic influenza learn how to prevent, protect, and mitigate learn what challenges we face the three criteria of a pandemic ability to isolate a new influenza virus from a human. Influenza, commonly known as the flu, is an infectious disease caused by an influenza virus. Birds, pigs, horses, ferrets, dogs, and cats can all be infected with various strains of the influenza virus. In addition to its typical manifestation as respiratory tract and systemic signs and symptoms, influenza can present as croup, bronchiolitis, pneumonia, febrile disease mimicking bacterial sepsis, or, on occasion, cns, cardiac, muscle, or renal complications. No new influenza virus subtypes have been detected in humans. Swine influenza is a highly contagious viral disease of the respiratory tract in swine and is distributed globally. A virus is an infectious agent made up of nucleic acid dna or rna wrapped in a protein coat called a capsid viruses have no. Learn how flu viruses get into and out of your cells using hemagglutinin and neuraminidase proteins on their surface. This category reflects the organization of international statistical classification of diseases and related health problems, 10th revision.
Influenza the u inuenza is a contagious disease caused by a group of respiratory viruses called inuenza viruses. After determining the appropriate compounds and mechanisms, the next step is to perform cytotoxicity analysis of the compounds to ensure your efficacy data are meaningful and within a reasonable therapeutic window. Preclinical and clinical demonstration of immunogenicity by mrna vaccines against h10n8 and h7n9 influenza viruses. The influenza a virus is unique among the viruses because it is frequently subject virus to antigenic variation, both major and minor. Evolution of influenza a virus in wild birds robert g. Centers for disease control and prevention may 2009 novel h1n1 influenza novel h1n1 referred to a swine flu early on is a new influenza virus that is spreading from persontoperson. Times new roman msgothic wingdings arial symbol ms p.
Influenza in humans is often referred to as the seasonal flu. Influenza a virus causes influenza in birds and some mammals, and is the only species of the genus alphainfluenzavirus of the virus family orthomyxoviridae. Virus powerpoint templates w virusthemed backgrounds. Silver nanoparticles have demonstrated efficient inhibitory activities against human immunodeficiency virus hiv and hepatitis b virus hbv. Swine flu, also called hog or pig flu, is an infection caused by any one of the several types of swine influenza virus siv which is common throughout pig population world wide. Generally, diseases outlined within the icd10 codes j09j11 should be included in this category. The finding that the outcome was dependent on the viral combinations suggests that different influenza viruses induce differing levels of temporary immunity, with the ah1n1pdm09 virus being the most effective in this study, followed by influenza b virus and influenza ah3n2 virus. This work is licensed under a creative commons attribution. Influenza a viruses are further divided into subtypes for those circulating in humans each season, these are ah1n1 viruses and ah3n2 viruses. Ppt influenza powerpoint presentation free to download. In this study, the interaction of silver nanoparticles with h1n1 influenza a virus was investigated. Influenza a virus was transmitted in a laboratory setting when a researcher was infected by a ferret that had been infected with a strain of influenza a virus and which sneezed violently at close range while it was being examined. Hpivs are also a cause of communityacquired respiratory tract infections of variable severity in adults.
The n antigen is responsible for the release of the virus from the infected cell. This category has the following 9 subcategories, out of 9 total. Once the flu virus enters a cell it can turn that cell into a viral factory making many more copies of the flu virus and causes illness. Binocs as he gives you a joyride of information about the most spectacular organism of this world, a virus.
Human parainfluenza viruses hpiv and other parainfluenza. It is a spikeshaped protein that extends from the surface of the virus. Jude childrens research hospital point mutations reassortment insertions and deletions recombination evolution of influenza a viruses h1 h2 h3 h4 h5 h6 h7 h8 h9 h10 h11 h12 h h14 h15 h16 influenza a. Download ppt the negative mrna control unexpectedly showed some delayed efficacy by day 21.
A free powerpoint ppt presentation displayed as a flash slide show on id. Mar 15, 2012 influenza a h1n1 influenza a h1n1 virus is a subtype of influenza a virus and was the most common cause of human influenza flu in 2009. Influenza a virus an overview sciencedirect topics. Hey, did you know that almost every ecosystem on earth contains viruses. This infographic briefly summarises the natural history, replication cycle, and pathogenesis of influenza viruses, the cause of seasonal influenza. When an influenza virus that normally circulates in swine but not people is detected in a person, it is called a variant influenza virus and denoted with the letter v. Inhibitory effects of silver nanoparticles on h1n1 influenza. If present in animals, the risk of human infection or disease is considered to be low.
The h antigen initiates infection following attachment of the virus to susceptible cells. So the genome in an influenza a virus is very different than the genome in the influenza b virus, and there are many more differences between a and b than there are between two influenza a viruses. General guidance and sample information is provided for reference and organizations are. The inuenza virus is highly contagious and causes serious illness that may result in hospitalization or death. Influenza virus flu baylor college of medicine houston, texas. Some strains of h1n1 are endemic in humans and cause a small fraction of all influenza like illness and a small fraction of all seasonal influenza. The flu can worsen longterm medical conditions, like congestive heart failure, asthma, or diabetes.