Prevention of RSV LRTI in healthy infantsa/Polack...DHF and OAS. EBiomedicine 17 RSV hu and TLR4....
Transcript of Prevention of RSV LRTI in healthy infantsa/Polack...DHF and OAS. EBiomedicine 17 RSV hu and TLR4....
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Prevention of RSV LRTI in healthy infants
Fernando P. Polack, MDFundacion INFANT
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Atypical measles. Nat Med 99
Abs and measles. Nat Med 00
RSV ERD. J Exp Med 02
RSV G and TLR4. PNAS 05
Avidity & AM. Nat Med 03
Avidity, TLR4, RSV. Nat Med 09
Pandemic influenza. Nat Med 11
DHF and OAS. EBiomedicine 17
RSV hu and TLR4. JCI 15
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TLRs and RSV-hMPV. JID 04
hMPV in VLBW. JID 06
LRTI and milk. Pediatr 08
Post-pandemic flu. NEJM 10
Pandemic flu . NEJM 10
hRV and IFN . AJRCCM 12
RSV and carbs. AJRCCM 13
RSV mortality. AJRCCM 17
RSV hu and TLR4. JCI 15
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Topics for review
• RSV burden in industrialized and developing countries. Who should we protect? What can we prevent?
• Different approaches to prevention of illness. Complementarity and competition.
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RSV burden in industrialized and developing countries. Who
should we protect?
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Location of incidence and hospital mortality studies (n=157)
6Funded by Bill & Melinda Gates Foundation
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33.8 (95% CI, 193-46.2) million episodes of RSV LRI annually in children < 5 years (22% of all ALRI episodes)
3.4 million episodes requiring hospitalization
66,000-199,000 deaths in 2005, 99% in developing countries
Updated estimates for RSV ALRI, severe ALRI (community based and hospitalized) and deaths in press by the RSV Global Epidemiology Network (RSV-GEN) .
RSV Global Burden Estimates (2005)
7Lancet 2017
30.5 (95% CI, 19.5-47.9)
2.8
15)
95,000-149,000
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Hospitalizations in countries according to income
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Mortality in countries according to income
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Rates in the United States
Hall CB et al. NEJM 2009
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Risk factors in the industrialized world
Hall CB et al. NEJM 2009
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Byinghton CL et al. Pediatrics 15
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RSV and non-RSV LRTI in the developing world (Argentina)
Geogeghan S et al, AJRCCM 17
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Severe RSV LRTI in developing country hospitals
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Hospital mortality in socially vulnerable populations
Geogeghan S et al, AJRCCM 17
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Geogeghan S et al, AJRCCM 17Geogeghan S et al, AJRCCM 17
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Mortality at the hospitals• RSV is the most frequent viral pathogen
associated with post-neonatal infant mortality.
• The virus was detected in 16% of all-cause hospital deaths; 57% of LRTI deaths where tests were performed.
• Its CFR was lower than that of non-RSV LRTI cases. Its importance relied on its dominating role as an agent of severe LRTI (65%), rather than on its specific lethality.
Geogeghan S et al, AJRCCM 17
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Nair H. Lancet 2005
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Community deaths in infants
Funded by Bill & Melinda Gates Foundation
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21
DOES THE AGE DISTRIUBTION OF DEATHSIN THE COMMUNITY RESEMBLE RSV DEATHS OR HOSPITALIZATIONS?
Hospitalizations
Community deaths
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22
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• Almost never lethal (severe co-morbidity), frequent disease (up to 50%) in the industrialized world responsible for ~1% hospitalizations* in infants and 5-10 fold higher rates of physician-confirmed LRTI.
• Frequent disease in the developing world with hospitalization rates 2-3%*, uncertain rates of LRTI and several distinct characteristics:
A significant number of severe cases do not reach the hospital.
99% deaths occur in developing countries, most often in post-neonatal infants.
Deaths at the hospital associate with poor medical practice, secondary bacterial infections and, less frequently, with
comorbidities.
RSV LRTI in infants
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Special populations
• TLR4 heterozygosity in urban sites.
• Children of asthmatic mothers.
• Navajo and Apache, Alaska, Maori.
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TLR4 heterozygosity and the environment
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palivizumab protection
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TLR4+/- in US premature babies failing palivizumab
Awomoji et al. J Immunol 2007
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RSV and TLR4 in Tel Aviv
Tal G et al. J Infect Dis 2004
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Caballero et al. J Clin Invest 15
Gene by environment interactionArgentina
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Navajo, Apache & Alaska natives
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Severe RSV LRTI in Alaska
Karron RA et al. JID 1997
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Severe RSV LRTI in Native Americans
Bokova J et al. Pediatr 2002
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expectedTLR4 hetsNavajo + ApacheAlaska InnuiAsthmatics
Severe RSV disease is a syndrome
with numerous endotypes that may benefit from different approaches
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RSV vaccines and monoclonal antibodies
Maternal immunization to protect infants
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Severe RSV LRTI in developing country hospitals
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Novavax– fusion protein nanoparicles (alum)
• RCT, placebo-controlled, group sequential: pregnant women 28-36 weeks of pregnancy to prevent symptomatic RSV-associated LRTI with hypoxemia for 90 days in infants
• Follow up: mothers until 6 months post-delivery, infants follow up for 12 months.
• Entering Y3.
• US, Mexico, Argentina, Chile, New Zealand, Australia, South Africa, Spain, UK, Philippines.
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RSV vaccines and monoclonal antibodies
Monoclonal antibodies
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Severe RSV LRTI in developing country hospitals
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• Passive RSV vaccine strategy using RSV F mAb
• Fully human, high potency IgG1 mAb derived from human B-cells• YTE half-life extension technology
• Targets site on RSV prefusion F• Neutralizes RSV A and B clinical isolates
• Single fixed IM dose given; expected to protect up to 6 months• Given at birth or at onset of RSV season
Medimmune – preF mAb
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Biosimilar palivizumab– WHO and University of Utrecht
• Palivizumab off patent in 2015
• Plan to develop a ‘biosimilar’ of palivizumab and reduce costs through
– Using high expression cell line.
– Estimated lower price
– Roll out the product in LMICs43
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RSV vaccines and monoclonal antibodies
Infant vaccines
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Severe RSV LRTI in developing country hospitals
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Vectored RSV vaccines for infants
• Janssen: Ad26.RSV.FA2
• GSK: ChAd155 RSV F, N and M2.1
• Bavarian Nordic: MVA FA, GA+GB, N and M2
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Sanofi- NIAID
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In summary…• Certain endotypes of RSV disease will probably
continue to associate with severe disease, and will require personalized medicine approaches for prevention and treatment.
• Some episodes of RSV LRTI will probably be replaced by episodes of non-RSV LRTI.
• Mortality will decrease at hospitals and in the community, even though mortality is driven by underlying baseline deficits in living standards and public health in developing countries.
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AcknowledgementsFUNDACION INFANT• Mauricio Caballero• Alejandra Bianchi• Eduardo Bergel• Sarah Geogeghan• Romina Libster• Adrian Ferreti
HOSPITALS• Luciano Alva Grimaldi• Andrea Sancillo• Juan Ves Losada• Karina Duenas• Fernando Ferrero• Andrea Rodriguez• Edgar Barboza• Guadalupe Fernandez Gago• Gabriela Bauer• Maria Ines Klein
LOCAL PUBLIC HEALTH OFFICIALS• Fernando Vallone• Lilana Orizonte• Alejandra Nuno• Vicente Ierace
NIEHS, NIH• Steven R. Kleeberger
VANDERBILT UNIVERSITY• Stokes Peebles• Mark Boothby
Funded by the National Institutes of Health (NIEHS), the Thrasher Research Fund and The Bill & Melinda Gates Foundation