safety monitoring of vaccines - uppsala...
TRANSCRIPT
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Jeremy Labadie MDvaccine safety specialist
Safety monitoring of vaccines
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• vaccines are special• immunization programmes• pharmacovigilance & vaccines• vaccines & AEFI• causality assessment of AEFI• UMC and AEFI
Vaccines
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vaccines are special
ADR
AEFI = Medical incident that takes place after an immunization which causes concern and is believed to be caused by immunization (WHO)
Vaccines
X
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vaccines are special
• biologicals• GMP , WHO requirements
• production variability
• Lot / Batch release
• fragile• temperature (cold chain), sunlight
Vaccines
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vaccines are special
• Summary of Product Characteristics:• pharmacokinetics data : immune responses• pharmacodynamics data : absent
• Vaccines are difficult to regulateNRA functions relating to vaccines
1. Marketing authorization and licensing activities2. Post-marketing surveillance (including AEFI surveillance)3. NRA lot release 4. Laboratory access 5. Regulatory inspections 6. Oversight of clinical trials
Vaccines
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59 countries have a functional NRA to regulate vaccines (2010):
NRA not functional or no data available
Countries where AEFI system have documented progress or and is functional
NRA functional
Adapted from: http://www.who.int/phi/news/Presentation14.pdf
Vaccinesvaccines are special
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vaccines are special
• preventive health care(most cost effective public health intervention)
• vaccines usually given to healthy individuals
• administered by trained person
• uniform dose & frequency (immunisation schedule)
• low tolerance for adverse reactions
• large number of vaccinations – potentially many coincidental events
Vaccines
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vaccines are special
• Combination vaccines (Hexavalent: diphtheria, tetanus, acellular pertussis, haemophilus influenzae type B, poliovirus and hepatitis B )
Causality assessment?
• Simultaneous administration of vaccinesCausality assessment?
Vaccines
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vaccines are special
• lot-by-lot surveillance
• need for vaccine distribution data
• progammatic used products- childhood immunisation programme- occupational immunisation programme (health care
professionals , military)
• programmatic errors
Vaccines
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• vaccines are special• immunization programmes• pharmacovigilance & vaccines• vaccines & AEFI• causality assessment of AEFI• UMC and AEFI
Vaccines
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Vaccines and schedule
• BCG, OPV: at birth• DPT, OPV, Hepatitis B : 6 - 10 - 14 weeks• Measles: 9 months
• In some countries: yellow fever, rubella, Haemophilus influenzae type B, pneumococcal and meningococcal vaccines
• Tetanus toxoid to women at/before child bearing age
Expanded Programme on Immunization
Vaccines
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Evolution of Immunization Programme and Prominence of Vaccine Safety
From RT Chen, CDC
Vaccines
Developing programmeProgrammatic Errors:• bacterial abscess• severe local reaction• high fever or sepsis• BCG lymphadenitis• toxic shock syndrome• clusters of AEFIs
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Evolution of Immunisation Program and Prominence of Vaccine Safety
From RT Chen, CDC
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public perception: BENEFIT < RISK
Vaccines
UK: Whole cell pertussis vaccine & neurological damage
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public perception: BENEFIT < RISK
Vaccines
UK: Measles, Mumps, Rubella (MMR) vaccine & autism
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problems• media seeking controversy• consumer groups internet!
parents of vaccine-injured(??) children
solutions• official immunization information:
- handling of vaccine safety concerns- vaccine risk communication- educate healthcare professionals
public perception: BENEFIT > RISK
Vaccines
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• vaccines are special• immunization programmes• pharmacovigilance & vaccines• vaccines & AEFI• causality assessment of AEFI• UMC and AEFI
Vaccines
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spontaneous reporting system [SRS]
• separate for vaccines:Australia, Denmark, India, Italy, Mexico, USA, ……
• SRS for all drugs [vaccines included]:France, New Zealand, Sweden, United Kingdom, Netherlands …..
pharmacovigilance & vaccines
Vaccines
lack of communication:
drug (ADR) - vaccine (AEFI)NRA/PV - NIP/EPI
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Potential objectives for AEFI Surveillance System
• detect, correct, and prevent programme errors• identify problems with vaccine lots or brand• prevent false blame from coincidental events• maintain confidence by properly responding to parent
/community concerns while increasing awareness (public and professional) about vaccine risks
• generate new hypotheses about vaccine reactionsthat are specific to the population
• estimate rates of occurrence on AEFI in the local population, compared with trial and international data
⇒ improving coverage, effectivity and safety
Vaccines
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• vaccines are special• immunization programmes• pharmacovigilance & vaccines• vaccines & AEFI• causality assessment of AEFI
Vaccines
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classification of AEFI• vaccine reaction
event caused or precipitated by the vaccine when given correctly; caused by inherent properties of the vaccine
• progammatic error caused by error in vaccine preparation, handling, or administration
• coincidental eventhappens after immunization but not caused by it – achance association
• injection reactionevent from anxiety about or pain from the injection itself rather than the vaccine
• unknownwhose cause can not be determined
Vaccines
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common ADR concepts?- de-challenge ? - re-challenge ? - allergic reaction ?
vaccine specific ADR concepts?- autoimmune disease?- allergic constitution?
immune response & AEFI
Vaccines
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• age specific immune responses[polysaccharide vaccines immunogenic > 2 years of age]
• age specific infectious disease risks[Mumps infection complications in adolescents & adults]
• age specific AEFI - HHE [first year of life]- febrile convulsions [first 5 years of life]
age & AEFI
Vaccines
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AEFI notification
• vaccine (type)• manufacturer• lot number• expiry date• shipped from..... to .........• route / site of administration• time to onset• nr. of previous doses• vaccinated at …?
Vaccines
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AEFI notification special reporting form (example Canada)
Vaccines
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• vaccines are special• immunization programmes• pharmacovigilance & vaccines• vaccines & AEFI• causality assessment of AEFI• UMC and AEFI
Vaccines
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causality & AEFI
• in short: can it? did it? will it?
Vaccines
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• antigen• adjuvans [aluminium salts, ASO3,
AS04, MF59]• preservative [thimerosal]• stabilisor [gelatine]• antibiotics [neomycine]• others - ph
- osmolarity
vaccines: cause of AEFI?
Vaccines
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When is “fever” FEVER ?
0102030405060708090
Nr of Studies (N=120)*
*Some studies with >1 cut off
37.5 38.0 38.3/ 38.5 39.0 39.5 40.0 40.5 41.037.8 Temperature C
From Jan Bonhoeffer
VaccinesCase definitions for AEFI
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• vaccines are special• immunization programmes• pharmacovigilance & vaccines• vaccines & AEFI• causality assessment of AEFI• UMC and AEFI
Vaccines
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countries with >1000 AEFI reports in the database
Improving global monitoring of vaccine safety: A quantitative analysis of adverse event reports in the WHO Adverse Reactions Database Megan Letourneau, George Wells, Wikke Walop and Philippe DuclosVaccine, Volume 26, Issue 9, 26 February 2008, Pages 1185-1194
UMC and AEFI
80%
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Top 10 drugs in <1 year of age
Reported drug Male Female
Diphtheria and tetanus toxoids and pertussis 7724 6714
Poliovirus vaccine live oral 6524 5681
Haemophilus B conjugate vaccine 6315 5467
Hepatitis B vaccine 3243 2898
Diphtheria/Tetanus/Pertussis/Haemophilus B vaccine 2375 2070
Poliomyelitis vaccine inactivated 1430 1281
Measles, mumps and rubella vaccine 963 894
Varicella virus vaccine, live 831 773
Palivizumab 681 521
Haemophilus influenzae B 661 620
UMC and AEFI
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AEFI reports (n = 246,877) versus ‘Other’ reports (n = 2,440,241
Improving global monitoring of vaccine safety: A quantitative analysis of adverse event reports in the WHO Adverse Reactions Database Megan Letourneau, George Wells, Wikke Walop and Philippe Duclos Vaccine, Volume 26, Issue 9, 26 February 2008, Pages 1185-1194
UMC and AEFI
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Technical Oversight Committee
Network Secretariat & Management GroupWHO (HQ, Regions), UMC
UNICEF + PAHO Revolving FundRepresentation of Member Countries
Members (12)Albania, Brazil, China, India (1
State), Iran, Kazakhstan, Mexico, Senegal, Sri Lanka, Tunisia, Uganda, Vietnam
Uppsala Monitoring Centre (UMC)
WHO Collaborating Centre for International Drug Monitoring
• Funding source: Gates Foundation PQ grant (approx 3.8 million USD)
UMC and AEFI
Global PMS Network
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• Improved reporting and analysis of vaccine safety data at global level• Quality of data • WHO-UMC tools and resources
for vaccines• Signal generation
• Improved assessment of causality• Investigation capacity• Individual case causality assessment • Assessment of signals (special studies as needed)
Global PMS Network: Expected outputs
No. 27, 2006, 81, 261–272
UMC and AEFI
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Pharmacovigilance training course 2001
UMC and AEFI
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