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Emerging and Re-emerging Infectious Diseases PowerPoint Presentation

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Description : Check out this medical presentation on Influenza (Flu), which is titled "Emerging & Re-emerging Infectious Diseases", to know about infectious diseases, definition of emerging and re-emerging diseases, and factors contributing to emergence of Infectious diseases.

Tags : Influenza, Flu, Infectious Diseases

Published on : Jul 12, 2021 | Views : 5382 | Downloads : 20

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Emerging & Re-emerging Infectious Diseases Dr. KANUPRIYA CHATURVEDI
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Dr. KANUPRIYA CHATURVEDI Outline Of Presentation Infectious diseases- trends Definition of emerging & re-emerging diseases Factors contributing to emergence Examples Public health response
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Dr. KANUPRIYA CHATURVEDI Infectious Disease- Trends Receded in Western countries 20th century Urban sanitation, improved housing, personal hygiene, antisepsis & vaccination Antibiotics further suppressed morbidity & mortality
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Dr. KANUPRIYA CHATURVEDI Infectious Disease- Trends Since last quarter of 20th century- New & Resurgent infectious diseases Unusually large number- Rotavirus, Cryptosporidiosis, HIV/AIDS, Hantaviraus, Lyme disease, Legionellosis, Hepatitis C……
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Dr. KANUPRIYA CHATURVEDI ? Infectious Diseases: A World in Transition
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Dr. KANUPRIYA CHATURVEDI Definition Emerging infectious disease Newly identified & previously unknown infectious agents that cause public health problems either locally or internationally
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Dr. KANUPRIYA CHATURVEDI Definition Re-emerging infectious disease Infectious agents that have been known for some time, had fallen to such low levels that they were no longer considered public health problems & are now showing upward trends in incidence or prevalence worldwide
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Dr. KANUPRIYA CHATURVEDI Factors Contributing To Emergence AGENT Evolution of pathogenic infectious agents (microbial adaptation & change) Development of resistance to drugs Resistance of vectors to pesticides
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Dr. KANUPRIYA CHATURVEDI Factors Contributing To Emergence HOST Human demographic change (inhabiting new areas) Human behaviour (sexual & drug use) Human susceptibility to infection (Immunosuppression) Poverty & social inequality
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Dr. KANUPRIYA CHATURVEDI Factors Contributing To Emergence ENVIRONMENT Climate & changing ecosystems Economic development & Land use (urbanization, deforestation) Technology & industry (food processing & handling)
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Dr. KANUPRIYA CHATURVEDI CONTD. International travel & commerce Breakdown of public health measure (war, unrest, overcrowding) Deterioration in surveillance systems (lack of political will)
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Dr. KANUPRIYA CHATURVEDI Transmission of Infectious Agent from Animals to Humans >2/3rd emerging infections originate from animals- wild & domestic Emerging Influenza infections in Humans associated with Geese, Chickens & Pigs Animal displacement in search of food after deforestation/ climate change (Lassa fever) Humans themselves penetrate/ modify unpopulated regions- come closer to animal reservoirs/ vectors (Yellow fever, Malaria)
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Dr. KANUPRIYA CHATURVEDI Climate & Environmental Changes Deforestation forces animals into closer human contact- increased possibility for agents to breach species barrier between animals & humans El Nino- Triggers natural disasters & related outbreaks of infectious diseases (Malaria, Cholera) Global warming- spread of Malaria, Dengue, Leishmaniasis, Filariasis
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Dr. KANUPRIYA CHATURVEDI Poverty, Neglect & Weakening of Health Infrastructure Poor populations- major reservoir & source of continued transmission Poverty- Malnutrition- Severe infectious disease cycle Lack of funding, Poor prioritization of health funds, Misplaced in curative rather than preventive infrastructure, Failure to develop adequate health delivery systems
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Dr. KANUPRIYA CHATURVEDI Uncontrolled Urbanization & Population Displacement Growth of densely populated cities- substandard housing, unsafe water, poor sanitation, overcrowding, indoor air pollution (>10% preventable ill health) Problem of refugees & displaced persons Diarrhoeal & Intestinal parasitic diseases, ARI Lyme disease (B. burgdorferi)- Changes in ecology, increasing deer populations, suburban migration of population
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Dr. KANUPRIYA CHATURVEDI Human Behaviour Unsafe sexual practices (HIV, Gonorrhoea, Syphilis) Changes in agricultural & food production patterns- food-borne infectious agents (E. coli) Increased international travel (Influenza) Outdoor activity
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Dr. KANUPRIYA CHATURVEDI Antimicrobial Drug Resistance Causes: Wrong prescribing practices non-adherence by patients Counterfeit drugs Use of anti-infective drugs in animals & plants
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Dr. KANUPRIYA CHATURVEDI CONTD. Loss of effectiveness: Community-acquired (TB, Pneumococcal) & Hospital-acquired (Enterococcal, Staphylococcal Antiviral (HIV), Antiprotozoal (Malaria), Antifungal
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Dr. KANUPRIYA CHATURVEDI Antimicrobial Drug Resistance Consequences Prolonged hospital admissions Higher death rates from infections Requires more expensive, more toxic drugs Higher health care costs
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HUMAN ANIMALS ENVIRONMENT VECTORS Zoonosis Population Growth Mega-cities Migration Exploitation Pollution Climate change Vector proliferation Vector resistance Transmission Antibiotics Intensive farming Food production
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Dr. KANUPRIYA CHATURVEDI Examples of recent emerging diseases Source: NATURE; Vol 430; July 2004; www.nature.com/nature
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Dr. KANUPRIYA CHATURVEDI Examples of Emerging Infectious Diseases Hepatitis C- First identified in 1989 In mid 1990s estimated global prevalence 3% Hepatitis B- Identified several decades earlier Upward trend in all countries Prevalence >90% in high-risk population
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Dr. KANUPRIYA CHATURVEDI CONTD. Zoonoses- 1,415 microbes are infectious for human Of these, 868 (61%) considered zoonotic 70% of newly recognized pathogens are zoonoses
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Dr. KANUPRIYA CHATURVEDI Emerging Zoonoses: Human-animal interface Marburg virus Hantavirus Pulmonary Syndrome Ebola virus Borrelia burgdorferi: Lyme Mostomys rodent: Lassa fever Avian influenza virus Bats: Nipah virus
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Dr. KANUPRIYA CHATURVEDI SARS: The First Emerging Infectious Disease Of The 21st Century No infectious disease has spread so fast and far as SARS did in 2003
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Dr. KANUPRIYA CHATURVEDI Lesson learnt from SARS An infectious disease in one country is a threat to all Important role of air travel in international spread Tremendous negative economic impact on trade, travel and tourism, estimated loss of $ 30 to $150 billion
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Dr. KANUPRIYA CHATURVEDI CONTD. High level commitment is crucial for rapid containment WHO can play a critical role in catalyzing international cooperation and support Global partnerships & rapid sharing of data/information enhances preparedness and response
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Dr. KANUPRIYA CHATURVEDI Highly Pathogenic Avian Influenza (H5N1) Since Nov 2003, avian influenza H5N1 in birds affected 60 countries across Asia, Europe, Middle-East & Africa >220 million birds killed by AI virus or culled to prevent further spread Majority of human H5N1 infection due to direct contact with birds infected with virus
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Dr. KANUPRIYA CHATURVEDI Novel Swine origin Influenza A (H1N1) Swine flu causes respiratory disease in pigs – high level of illness, low death rates Pigs can get infected by human, avian and swine influenza virus Occasional human swine infection reported In US from December 2005 to February 2009, 12 cases of human infection with swine flu reported
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Dr. KANUPRIYA CHATURVEDI Swine Flu Influenza A (H1N1) March 18 2009 – ILI outbreak reported in Mexico April 15th CDC identifies H1N1 (swine flu) April 25th WHO declares public health emergency April 27th Pandemic alert raised to phase 4 April 29th Pandemic alert raised to phase 5
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Dr. KANUPRIYA CHATURVEDI Influenza A (H1N1) By May 5th more than 1000 cases confirmed in 21 countries Screening at airports for flu like symptoms (especially passengers coming from affected area) Schools closed in many states in USA May 16th India reports first confirmed case Stockpiling of antiviral drugs and preparations to make a new effective vaccine
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Dr. KANUPRIYA CHATURVEDI 32
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Dr. KANUPRIYA CHATURVEDI Pandemic HINI (Swine flu) Worldwide- 162,380 cases 1154 deaths India- 558 cases 1 death
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Dr. KANUPRIYA CHATURVEDI Examples of Re-Emerging Infectious Diseases Diphtheria- Early 1990s epidemic in Eastern Europe(1980- 1% cases; 1994- 90% cases) Cholera- 100% increase worldwide in 1998 (new strain eltor, 0139) Human Plague- India (1994) after 15-30 years absence. Dengue/ DHF- Over past 40 years, 20-fold increase to nearly 0.5 million (between 1990-98)
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Dr. KANUPRIYA CHATURVEDI
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Dr. KANUPRIYA CHATURVEDI Bioterrorism Possible deliberate release of infectious agents by dissident individuals or terrorist groups Biological agents are attractive instruments of terror- easy to produce, mass casualties, difficult to detect, widespread panic & civil disruption
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Dr. KANUPRIYA CHATURVEDI CONTD. Highest potential- B. anthracis, C. botulinum toxin, F. tularensis, Y. pestis, Variola virus, Viral haemorrhagic fever viruses Likeliest route- aerosol dissemination
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Dr. KANUPRIYA CHATURVEDI Key Tasks in Dealing with Emerging Diseases Surveillance at national, regional, global level epidemiological, laboratory ecological anthropological Investigation and early control measures Implement prevention measures behavioural, political, environmental Monitoring, evaluation
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Dr. KANUPRIYA CHATURVEDI National surveillance: current situation Independent vertical control programmes Surveillance gaps for important diseases Limited capacity in field epidemiology, laboratory diagnostic testing, rapid field investigations Inappropriate case definitions
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Dr. KANUPRIYA CHATURVEDI CONTD. Delays in reporting, poor analysis of data and information at all levels No feedback to periphery Insufficient preparedness to control epidemics No evaluation
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Dr. KANUPRIYA CHATURVEDI Solutions Public health surveillance & response systems Rapidly detect unusual, unexpected, unexplained disease patterns Track & exchange information in real time Response effort that can quickly become global Contain transmission swiftly & decisively
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Dr. KANUPRIYA CHATURVEDI GOARN Global Outbreak Alert & Response Network Coordinated by WHO Mechanism for combating international disease outbreaks Ensure rapid deployment of technical assistance, contribute to long-term epidemic preparedness & capacity building
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Dr. KANUPRIYA CHATURVEDI Sharing Outbreak-related Information with Public Health Professionals with Public
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Dr. KANUPRIYA CHATURVEDI Solutions Internet-based information technologies Improve disease reporting Facilitate emergency communications & Dissemination of information Human Genome Project Role of human genetics in disease susceptibility, progression & host response
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Dr. KANUPRIYA CHATURVEDI Solutions Microbial genetics Methods for disease detection, control & preventio Improved diagnostic techniques & new vaccines Geographic Imaging Systems Monitor environmental changes that influence disease emergence & transmission
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Dr. KANUPRIYA CHATURVEDI Key tasks - carried out by whom? National Global Synergy
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Dr. KANUPRIYA CHATURVEDI What skills are needed? Multiple expertise needed ! Infectious diseases Epidemio- logy Public Health International field experience Information management Laboratory Telecom. & Informatics
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Dr. KANUPRIYA CHATURVEDI Global Disease Intelligence: A world on the alert Collection Verification Distribution Response
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Dr. KANUPRIYA CHATURVEDI The Best Defense (Multi-factorial) Coordinated, well-prepared, well-equipped PH systems Partnerships- clinicians, laboritarians & PH agencies Improved methods for detection & surveillance
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Dr. KANUPRIYA CHATURVEDI CONTD. Effective preventive & therapeutic technologies Strengthened response capacity Political commitment & adequate resources to address underlying socio-economic factors International collaboration & communication