Avian Influenza (plagiarised) Roger Bowers. Avian Influenza Bird flu Avian influenza is a disease of birds caused by influenza viruses closely related.

Slides:



Advertisements
Similar presentations
Will the Avian Flu Become the Next Epidemic?
Advertisements

C E N T R A L P I E D M O N T C O M M U N I T Y C O L L E G E Pandemic and Influenza: A Guide to Understanding.
Swine flu.
Plate 85 Viral Diseases of the Respiratory System.
Epidemics How can we protect ourselves against bird flu?
Epidemiology J Endemic, epidemic or pandemic? Disease prevention
Avian Influenza – The Bird Flu
Avian Flu Yurij Kobasa & Ambrish Patel. Overview 1. Background Information 2. Brief overview of genome structure 3. Origin/History 4. Geographical Distribution.
INFLUENZA. VIROLOGY OF INFLUENZA Subtypes: A - Causes outbreak B - Causes outbreaks C - Does not cause outbreaks.
About Swine Flu Dr.Kedar Karki. What is Swine Influenza? Swine Influenza (swine flu) is a respiratory disease of pigs caused by type A influenza virus.
Plate 85 Viral Diseases of the Respiratory System.
Seasonal Influenza and Swine-Origin Influenza A (H1N1) Virus
Clinical Outcomes of Influenza Infection Asymptomatic Asymptomatic Symptomatic Symptomatic  Respiratory syndrome - mild to severe  Involvement of major.
By Andrew Garaniel University of California, Irvine
Avian Influenza – What does it all mean? Important Background Information Island Paravets and Residents.
Influenza Ieuan Davies. Signs and Symptoms Influenza is an acute, viral respiratory infection. Fever, chills, headache, aches and pains throughout the.
H1N1: “Swine Flu”. Why you should care… Every year between 5 and 20% of the population gets the flu. The CDC estimates that the flu kills 36,000 people.
Avian Flu H5N1 ERIC 吳玟晏 JANE 呂嘉心
Epidemic Vs Pandemic 8.L.1.2.
DR MOHAMMED ARIF. ASSOCIATE PROFESSOR. CONSULTANT VIROLOGIST. HEAD OF THE VIROLOGY UNIT. Viral infection of the respiratory tract -- 2.
INTRODUCTION TO INFLUENZA The (Ferret) Sneeze Heard Around The World: The Case Of The Bioengineered Bird Flu Case Study for AAC&U STIRS Project Jill M.
Developing a vaccine and how a pandemic could occur.
In 1918, the Spanish flu started off as a normal human influenza virus took a terrible turn and became terribly lethal. This was the first major flu.
PANDEMIC RISK. 3 pre-requisites for a Pandemic 1. The emergence of a new virus strain with no circulating immunity within the human population 2. The.
سورة البقرة ( ۳۲ ). Influenza is a serious respiratory illness which can be debilitating and causes complications that lead to hospitalization and.
Emerging Viruses BY PLAN A. Topic Questions  Why are these new viruses more harmful compared to the previous form of the virus?  Why is it so difficult.
BIRD FLU Prepared by: Haifa Al-Dhahri. Bird Flu(Avian influenza): Avian influenza viruses compose the Influenzavirus A genus of the Orthomyxoviridae family.
Microbiology of Influenza
Avian Influenza "bird flu" Contagious disease of animals caused by viruses that normally infect only birds and pigs H5N1 can infect people (very rarely)
Epidemiology of Influenza. The Flu Basics The flu is contagious and can range from mild to deadly Each year between 5% and 20% of the US population contracts.
2008 Avian Flu 1. Avian influenza is an infection caused by (bird) influenza viruses naturally occurring among birds. Wild birds worldwide carry the viruses.
What’s up with the flu? Novel H1N1? SWINE FLU??? Mexican flu? swine-origin influenza A? A(H1N1)? S-OIV? North American flu? California flu? Schweingrippe.
HOW DO VIRUSES CROSS THE SPECIES BARRIER? Rachel Rezabek.
© 2005 Prentice Hall Inc. / A Pearson Education Company / Upper Saddle River, New Jersey “Bird flu”  Caused by avian influenza virus (AIV)  Endemic.
Pandemic Influenza: What Is It and Why Should We Care? Dr. Judith A. Monroe, MD State Health Commissioner.
Fungi  Fungi are eukaryotic (have a nucleus) organisms, and most are multicellular heterotrophs (they do NOT make their own food).  Most fungi reproduce.
Avian Influenza H5N1 Prepared by: Samia ALhabardi.
OBJECTIVES Pandemic Influenza Then and Now Public Health Pandemic Influenza Planning –What to expect –What not to expect Individual/Employee Pandemic.
REASSORTMENT OF INFLUENZA VIRUS
Influenza Influenza Virus magnified 100,000X. What is Influenza? Virus; causes chills, fever, sore throat, fatigue.
Dr A.J.France. Ninewells Hospital © A.J.France 2010.
Communicable Disease Surveillance and Response, WHO Avian Influenza Credit: WHO Viet Nam.
Diseases Unit 3. Disease Outbreak  A disease outbreak happens when a disease occurs in greater numbers than expected in a community, region or during.
Virion Structure and Organization
Emerging Diseases Lecture 12: Influenza Virus and the 1918 Pandemic 12.1 Overview 12.2 The pathogen-Influenza Virus A 12.3: Naming System 12.4: A Disease.
It’s Just Not the Flu Anymore Rick Hong, MD Associate Chairman CCHS EMC Medical Director, PHPS.
INFLUENZA LUKE UYEMURA ENGLISH 100 ESP. BASIC INFO Definition: Influenza, more commonly know as the flu, is a viral infection that attacks your respiratory.
Avian Influenza: A Zoonotic Disease of International Importance 1.
The Vermont Department of Health Update on Pandemic Threat Cort Lohff, MD, MPH State Epidemiologist Guidance Support Prevention Protection.
1 Animal pathogens: viruses Topic 11 Ms Sherina Kamal.
Notes: Spread, Treatment, and Prevention of Disease
To Dear Staff and Students The prevention of respiratory tract disease----- influenza The prevention of respiratory tract disease----- influenza.
Will it be just a scare … or a scar on human history? Bird flu.
Preparedness and Prevention for a Influenza Pandemic
WHO/HSE Tanzania February 01, 2017
Emerging Diseases Lecture 12: Influenza Virus and the 1918 Pandemic
Avian Influenza A (H5N1) “Bird Flu”
Copyright © 2017 American Academy of Pediatrics.
Emerging Diseases Lecture 12: Influenza Virus and the 1918 Pandemic
H7N9 Avian Influenza: What You Need to Know, Not Fear
Influenza Virus: Evolution in real time
Airborne Pathogens except TB
Spread, Treatment, and Prevention of Disease
Influenza Vaccines MedCh 401 Lecture 5 19May06 KL Vadheim Lecture 4.
Influenza يك بيماري بسيار مسري عفوني ويروسي است.
الوحدة العلمية ووحدة الدعم الفني في المختبر المركزي
Avian Influenza Dr K L Critchley Veterinary Officer - Retired
وبائية أنفلونزا الطيور والإجراءات المتخذة لمواجهة الوباء العالمي
Emerging Diseases Lecture 12: Influenza Virus and the 1918 Pandemic
Avian influenza ( Bird flu )
Presentation transcript:

Avian Influenza (plagiarised) Roger Bowers

Avian Influenza Bird flu Avian influenza is a disease of birds caused by influenza viruses closely related to human influenza viruses. Transmission to humans in close contact with poultry or other birds occurs rarely and only with some strains of avian influenza. The potential for transformation of avian influenza into a form that both causes severe disease in humans and spreads easily from person to person is a great concern for world health.

(DNA)

Typical infectious cycle.

 Influenza viruses classified into types A, B or C based on differences between their nucleoprotein and matrix protein antigens (substance that stimulates an immune response).  Avian Influenza … type A.  Further classified by proteins haemagglutinin (H) and neuraminidase (N) … projections on their surfaces. There are 14/15 H subtypes and 9 N subtypes of influenza A  To date all highly pathogenic AI viruses that cause generalised rather than respiratory disease belong to either the H5 or H7 subtypes; classic fowl plague H7N7  The pathogenicity of AI viruses is correlated with cleaving of haemagglutinin molecule into two subunits … use to determine whether or not an isolated virus is potentially pathogenic.

Influenza Type A Can infect people, birds, pigs, horses, seals, whales, and other animals, but wild birds are the natural hosts Only some influenza A subtypes (i.e., H1N1, H1N2, and H3N2) are currently in general circulation among people. Within subtypes of avian influenza or A viruses there also are different strains. H5 and H7 viruses can be distinguished as “low pathogenic” and “high pathogenic” forms on the basis the severity of the illness they cause in poultry; influenza H9 virus has been identified only in a “low pathogenicity” form. Each of these three avian influenza A viruses (H5, H7, and H9) theoretically can be partnered with any one of nine neuraminidase surface proteins; thus, there are potentially nine different forms of each subtype (e.g., H5N1, H5N2, H5N3, H5N9).

Influenza A H5 Potentially nine different subtypes Can be highly pathogenic or low pathogenic H5 infections have been documented among humans, sometimes causing severe illness and death Influenza A H7 Potentially nine different subtypes Can be highly pathogenic or low pathogenic H7 infection in humans is rare, but can occur among persons who have direct contact with infected birds; symptoms may include conjunctivitis and/or upper respiratory symptoms Influenza A H9 Potentially nine different subtypes Documented only in low pathogenic form At least three H9 infections in humans have been confirmed Influenza Type B Influenza B viruses are normally found only in humans. Unlike influenza A viruses, these viruses are not classified according to subtype. Although influenza type B viruses can cause human epidemics, they have not caused pandemics. Influenza Type C Influenza type C viruses cause mild illness in humans and do not cause epidemics or pandemics. These viruses are not classified according to subtype.

Influenza viruses can change in two different ways: “Antigenic drift," which occurs through small changes in the virus that happen continually over time. Antigenic drift produces new virus strains that may not be recognized by antibodies to earlier influenza strains. In most years, one or two of the three virus strains in the influenza vaccine are updated to keep up with the changes in the circulating flu viruses. The other type of change is called "antigenic shift." Antigenic shift is an abrupt, major change in the influenza A viruses, resulting in a new influenza virus that can infect humans and has a hemagglutinin protein or hemagglutinin and neuraminidase protein combination that has not been seen in humans for many years. Antigenic shift results in a new influenza A subtype. If a new subtype of influenza A virus is introduced into the human population, if most people have little or no protection against the new virus, and if the virus can spread easily from person to person, a pandemic (worldwide spread) may occur. Influenza viruses are changing by antigenic drift all the time, but antigenic shift happens only occasionally. Influenza type A viruses undergo both kinds of changes; influenza type B viruses change only by the more gradual process of antigenic drift.

Defra project – modelling avian influenza in UK poultry industry Network model based on UK poultry farms (41,000) Different G ij, τ for –Local ‘non-operational’ transmission (air-borne, environmental, walkers); based on distance –Global ‘operational’ contact (sharing hatcheries, slaughter-houses, feed mills,….) Stochastic simulation & (like) pair-approximation for epidemics; parameterisation?? ‘Natural’ epidemics Control – switches off some G ij

Grandparent stock Parent stock Rearing farm Parent stock Prod farm H H Broiler farm SH Parent stock Rearing farm Parent stock Prod farm H Broiler farm SH Broiler farm Independent Catchers SH Catchers SH Broiler farm Other species Esp turkeys SH Other species SH Feed mill Vaccination teams Imported? Feed mill SH Cleaning teams Cleaning teams BROILERS Arrows indicate movement of : movement of birds movement of eggs movement of personnel movement of feed Obviously each type of movement will also have associated movements, i.e. vehicles

END