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Global Infectious Diseases Objectives Problem Determinants Diseases Control and eradication Triumphs Tribulations Away All Disease! DEFINITIONS CONTROL: Reduction of disease incidence, prevalence, morbidity, mortality, and disability to a locally acceptable level ELIMINATION: Reduction of infection and disease to zero in a defined area. Continued efforts required. ERADICATION: Permanent reduction of worldwide incidence to zero as a result of deliberate interventions. Continued efforts not required. DESTRUCTION: Destruction of all isolates of microbial agent. Problems in Defining Burden Poor case definition Poor recognition Poor diagnosis Poor reporting Poor statistical use Poor understanding of problem Poor control actions Poor resource allocation Human Eradication Programs Hookworm, 1909 Animal Yellow fever, 1915 Bovine contagious pleuropneumonia (cows), 1884 Aedes aegypti, 1934-42 Anopheles gambiae, 1939-68 Glanders (horses, mules) Malaria, 1955-1973 Piroplasmosis (cattle, “Texas fever” Yaws, 1950 Dourine (STD of horses) Smallpox, 1958, 1966-80 Rinderpest Poliomyelitis, 1985 Sheep pox Dracunculiasis, 1987 Fogarty Internationa Center Eradication and Elimination Programs Eradication Elimination Yellow fever (failed) Onchocerciasis Aedes aegypti (failed) (Onchocera volvulus)• Anopheles gambiae (failed) Filariasis Yaws (failed) (Wuchereria bancrafti) • Malaria (failed) Measles • Smallpox (success) Chagas disease Guinea worm (Tryanasomia cruzi) • (dracunculiasis)* Tuberculosis Poliomyelitis * * eradication underway • elimination underway Candidates for Elimination Haemophilus influenzae type B Neonatal tetanus Rabies Yellow fever Japanese B encephalitis Hepatitis A Hepatitis B Rubella Global Infectious Diseases Objectives Problem Determinants Diseases Control and eradication Triumphs Tribulations Control vs. Eradication Control Eradication Cost Continual Limited/high initial Time Continual Limited Cases Acceptable Zero Political will Useful Essential Epidemiology Known/unknown Completely known Research Essential Essential Edward Jenner’s Clairvoyance “…It now becomes too manifest to admit of controversy, that the annihilation of the Small Pox, the most dreadful scourge of the human species, must be the final result of this practice.” — Edward Jenner, The Origin of the Vaccine Inoculation, 1801 Fogarty International Center Biologic and Epidemiolgic Basis for Smallpox Eradication • Humans were the only reservoirs and vectors • No intermediate host • All cases symptomatic with typical rash • Lifelong immunity after disease • Laboratory diagnosis effective • Incubation period 7-17 days, conducive to control • Effective heat-stable vaccine • Mode of acquisition and transmission known • Pathogenesis and pathology known • Research important Social, Political and Economic Factors Favoring Smallpox Eradication • • • • • • Disfiguring disease Periodic epidemics Endemic countries started activities at same time All non-endemic countries at peril Prestige to countries, bilateral and international organizations Economic benefits to all * stop vaccination * stop vaccination card and border controls * stop medical costs due to vaccine complications Rahima Banu, age 3, Last Case of variola major, Bangladesh, 1975 Poliovirus Importations in 2000 and 2001 Label, 2002 Savings from International Disease Eradication Programs U.S. Eradication Disease Smallpox World 1949 – 1977 Cost/Contribution $30 million/30 1998 million Savings $30 million every 26 days in U.S. $421 million per year $11 billion since 172 when vaccination stopped in U.S. Poliomyelitis 1979 – 2000 Ongoing 2000 2015 Measles Americas 2000 Ongoing Europe 2007 Middle East 2010 $500 million yearly worldwide $3 billion yearly Huge Fogarty International Center Vaccination and Savings to Society Vaccine Diphtheria – titanus – pertussis Savings per Dollar Spent $29 (DPT) Measles – mumps – rubella $13 Oral polio vaccine $ 6 (MMR) (OPV) Varicella (chickenpox) $5 Hemopulus influenza, type b $2 Hepatitis B (infant) $ 2 ____ Savings per $6 dollars invested = $57 Ratio of savings to investment ~ 10: 1 Global Infectious Diseases Objectives Problem Determinants Diseases Control and eradication Triumphs Tribulations Ebola Virus, Zaire, 1976 Unfixed diagnostic specimen from Vero cell passage: sodium phosphotungstate x90,000 (Fred Murphy) Number of Cases of Ebola Hemorrhagic Fever in the Equator Region, by Day of Onset and Probable Type of 50 Transmission, 1976 Probable Type of Transmission Person to Person Both Syringe 45 40 35 30 25 20 15 10 5 1-3 4-6 7-9 10-12 13-15 16-18 19-21 22-24 25-27 28-30 September 1-3 4-6 7-9 10-12 13-15 16-18 19-21 22-24 October 25-27 28-30 Patient with Ebola Hemorrhagic Fever, Bumba Zone, Equateur Province, DR Congo (Zaire), October 1976 Ebola Virus Marburg Virus Both Syndromes Potentially Resulting from Bioterrorism Encephalitis Hemorrhagic mediastinitis Pneumonia with abnormal liver function tests (LFTs) Papulopustular rash Hemorrhagic fever Descending paralysis Nausea, vomiting ± diarrhea Biologic Warfare with Smallpox … at the time of the Pontiac rebellion, 1763: QUESTION: “Could it not be contrived to send smallpox among those disaffected tribes of Indians? We must on this occasion use every strategem in our power to reduce them.” — Sir Jeffrey Amherst, Commander-in-Chief, British Forces, North America Heagerty, 1928, cited in Fenner et al, 1988 Biologic Warfare with Smallpox … at the time of the Pontiac rebellion, 1763: ANSWER: “I will try to inoculate them with some blankets that may fall in their hands, and take care not to get the disease myself.” — Colonel Henry Bousquet Heagerty, 1928, cited in Fenner et al, 1988 The Tribulations Smallpox and Biologic Terrorism • Does smallpox virus exist outside of two WHO collaborating centers? * Ken Alibek’s story in Biohazard; other countries, groups * Verification Preparedness * Diagnosis * Primary care * Antiviral therapy * Vaccination • Prevention of hysteria and disorder Fogarty International Center Scientific Needs for Live Variola Virus Institute of Medicine, 1999 Development of antiviral agents Development of improved and new vaccines Detection and diagnosis Bioinformatics, genetic variability Understanding the biology of the variola virus Research on expressed protein products of variola Research, Training, and Support Needs According to Understanding of Diseases and Efficacy of Control Methods High High Training Efficacy of Control Methods Low Research Needs Some Moderate Research Support Needs High Low Research, Training, and Support Needs According to Understanding of Diseases and Efficacy of Control Methods High Efficacy of Control Methods Low High Training Dengue Malaria HIV/AIDS Tuberculosis Ebola/Marburg Influenza Cancers Alzheimer’s Smallpox Guinea worm Poliomyelitis H. influenzae type B Measles Tetanus Some Moderate Research Support Needs High Research Needs Low Infectious Causes of Common Chronic Diseases Helicobacter pylori (peptic ulcers) Hepatitis B and C (cirrhosis and liver cancer) Human herpesvirus 8 (Kaposi’s sarcoma) Human papillomavirus (cervical cancer, recurrent respiratory infections, and papillomatosis) Epstein-Barr virus (posttransplant lymphoproliferative disease, B-cell lymphoma) Rank Order of Disease Burden for 15 Leading Causes Disease or Injury 1990 Rank Disease or Injury 2020 Rank Lower respiratory infections (pneumonia) 1 Ischaemic heart disease 1 Diarrhoeal diseases 2 Unipolar major depression 2 Perinatal (newborn) conditions 3 Road traffic accidents 3 Unipolar major depression 4 Cerebrovascular disease 4 (stroke) Ischaemic heart disease 5 Cerebrovascular disease 6 Tuberculosis 7 Measles 8 Chronic obstructive pulmonary disease Lower respiratory infections 5 Tuberculosis War 7 6 8 Rank Order of Disease Burden for 15 Leading Causes (2) Disease or Injury 1990 Road traffic accidents Congenital anomalies Rank 9 10 Chronic obstructive pulmonary disease 11 Malaria Falls Iron deficiency anemai Protein-energy malnutrition 12 13 14 15 Disease or Injury 2020 Diarrhoeal diseases HIV Perinatal conditions Violence Congenital anomalies Self-inflicted injuries Trachea, bronchus and lung cancer Rank 9 10 11 12 13 14 15 For More Information E-mail: [email protected] Fogarty International Center www.nih.gov/fic www.nih.gov Ebola, Zaire, 1976 Spectrum of Emotion and Activity Highest Anxiety Less high Activity Confidence Uncertainty Anger (false) Celebration Terror Sorrow Understanding Comfort Fear (false) People fleeing Active case Patient Rapid detection Chaos Surveillance management Plasmapheresis ComIsolation Investigations/ Field mission and Investigations quick formed quarantine Information Sharing Low High Lessons Applicable to Other Programs • Clear objectives known to all • Scientifically justifiable * No animal reservoir * Clinically manifest * Two-week incubation period * Virus did not survive in environment Fogarty Internationa Center Lessons Applicable to Other Programs (2) • Operationally feasible but difficult * Effective, heat-stable vaccine * Vaccine protection of long duration * Vertical programs supported nationally and internationally * All programs started together * field staff needs are top priority Fogarty Internationa Center Lessons Applicable to Other Programs (3) • Research and evaluation is crucial * Diagnosis * Active surveillance for cases * Coverage surveys for vaccination * Epidemiology to define groups at risk * Vaccine delivery systems * Adverse events from vaccination * Monkeypox and other orthopoxviruses * Poxviruses as vaccine vectors * Therapeutics Fogarty Internationa Center Lessons Applicable to Other Programs (4) • Confirmation of eradication * Independent commissions * Certification format * Credibility and confidence Fogarty Internationa Center Lessons Applicable to Other Programs (5) • Exchange of experiences * Routine disease surveillance * Special communications (research, outbreaks) * Cross-notification of importations * Transparency Political, administrative, and economic * Commitment of high-level leadership * Use political/administrative infrastructure * Sustaining interest is difficult at the end * Show medical and economic improvements * Use staff who have been successful in one program in others Fogarty International * Achieve altruistic goal Center