[nearly] 50 years of lassa fever: the road ahead › wp-content › ... · lassa fever is a...
TRANSCRIPT
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Robert F. Garry, PhDTulane University
Zalgen Labs
[Nearly] 50 years of Lassa fever:The road ahead
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February 1969 - deadly unidentified virus
reported from remote African missionary
hospital, two American nurses stricken and died
within 10 days. Doctors stymied by mysterious
symptoms of the killer: soaring temperature,
painful backache, swelling of the throat and
neck, discolored skin! Latest victim airlifted to
special isolation ward at New York's Columbia
Presbyterian Hospital, blood samples rushed to
Yale's Arborvirus [sic] Laboratory, all-out search
launches to discover an antidote. U. S. Public
Health officials alarmed, virus has the potential to
decimate the whole population, aviation officials
consider cancellation of all jet travel to critical
world areas.
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L.P.= Lily [Penny] Pinneo, RN
J.C.= Jordi Casals, MD
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Penny with Jordi Casals and Raphael Adeyemi, a Nigerian Medical auxiliary, at the hospital in Jos, Nigeria, circa 1970. LASV Pinneo strain
Lineage I
500 mL
serum
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Lassa
fever
photos
Dan
Bausch,
MPHTM,
MD
70% case fatality rate in patients presenting while viremic(Shaffer et al., 2014).
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Lassa fever is a zoonosisPhoto credits:Lina Moses, PhDTulane
Lassa fever is acquired
through contact with excreta or
the preparation of “rat” for food
Mastomys natalensis (multimammate “rat”)
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Where we work in West AfricaSites in Sierra Leone and Nigeria
Christian HappiFirst EVD Nigeria
July 20, 2014
Augustine GobaFirst EVD Sierra Leone
May 25, 2014
KristianAndersenet al. 2015
VI
V
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1970sTo
1980s
20081993
2010
Lassa fever program at Kenema Government Hospital
Internationalteam refurbishes Lassa Laboratory
Blood Diamonds civil conflict
forces suspension of
Lassa program
Establishment of
recombinant LassaELISA
diagnostics
Introduction of ReLASV lateral
flow immunoassays
Important site for Lassa fever
researchby CDC and
others
1970sand
1980s2005 2010
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Lassa fever diagnosis
LASV antigen, LASV RNA or antiLASVantibody
Persistence in urine or semen? Lily (Penny) Pinneo
(1917-2012)
Bond et al., Am J Trop Med Hyg. 2013 88:241-4.
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Slide Credit: Kristian Andersen (Scripps)
Ebola came to us[over ten years ago]
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Kenema Government Hospital
Dr. S. HumarrKhan
Healer
Nurse WillPooley
Dr. Ian Crozier
Kenema: Early epicenter of the 2013-16 Ebola Outbreak
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:
THE TERRIFYING TRUE STORY OF
EBOLA OUTBREAK IN WEST AFRICA
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Roots, Not
Parachutes: Research
Collaborations Combat
Outbreaks
Nathan L. Yozwiak, Christian T.
Happi, Donald S. Grant, John S.
Schieffelin, Robert F. Garry,
Pardis C. Sabeti, Kristian G.
Andersen
Cell
Volume 166, Issue 1, Pages 5-8 (June 2016)
DOI: 10.1016/j.cell.2016.06.029
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Photo credit: Allison Smither
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Dr S. HumarrKhan
Dr ChristianHappi
DrPardisSabeti
Bob
May 14, 2014
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“Confirmed” cases of Lassa fever in Nigeria
Dry season Siddle et al. NEJM, Oct. 17, 2018
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Ebola virus
21 (of 36) states have recorded at least one confirmed case
Africans sequencing on African soil in real-time
IIBIIA
III
IV
1-50 confirmed cases
>50 confirmed cases
No confirmed cases
1 dot = confirmed case
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IIA
III
IIB
Pardis Sabeti
Christian Happi
Katherine Siddle
Siddle et al. NEJM, Oct. 17, 2018
III
No unusual strain aka super Lassa virusNo extended human-to-human transmissionIt’s all about the rodent transmission.
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Christian Happi
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Ecology – Rodent analysis and control
KGH Viral Hemorrhagic Fever Ecology TeamJUST BACK FROM NIGERIA
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Most neutralizing human monoclonal antibodies target novel epitopes requiring both Lassa virus glycoprotein subunits
James E. Robinson et al.Nature Communications 7 (2016) doi:10.1038/ncomms11544
The best antibodies
bind this (Erica)
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Binding here blocks a-dystroglycaninteraction
Binding here is non-neutralizing
Binding here blocks fusion
Bindinghere blocks fusion and LAMP-1interaction
Lassa virus B cell epitopes and how the work
Erica and Kate
Kathryn M. Hastie, Erica Ollmann Saphire and
Michelle A. Zandonatti
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Tom Geisbert
Bob Cross
Chad Mire
Luis Branco
• 3 huMabsdown-selected to 2
• BispecifichuMAbs work
• Effective at 1.5 mg/Kg against diverse lineages
• Rationally engineered Mabs in pipeline (Erica/Kate)
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Khan Center of Excellence(NIH- ICIDR)
Dr. Donald S. Grant
Simbirie Jalloh
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Bilateral Hearing loss in both Ebola and Lassa fever survivors
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Polymorphic variants within populations sampled in the 1000
Genomes Project
Nature 526, 68–74 (01 October 2015)
Ongoing GWAS and other Systems Biology studies in Ebola and Lassa fever (Sabeti/Andersen)
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Thanks to Georges Thiry for pointing out that Lassa fever is one of 3 epidemic infectious diseases (with Nipah and MERS) prioritized for rapid vaccine development by the Coalition for Epidemic Preparedness and Innovations (CEPI). Indeed, Lassa efficacy trials are possble!
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Ongoing antiLASVseroprevalence
study in Sierra Leone
28 endemic communities
KENEMA
20 emerging communities
TONKOLILI
20 non-endemic communitiesPORT LOKO
Enumerate all households in communityRandomize households
20+ households
20+ households
20+ households
1 each in 5 age groups
1 each in 5 age groups
1 each in 5 age groups
Collection of blood spots for IgG testingDemographic questionaire
Screening of blood spots by ELISA
Statistical analysis and reporting
High
Emerging (?)Low(?)
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House level demographics and serology
High Lassa seroprevalence villages are found across Sierra Leone
~10,000 DBS
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LASV sero-prevalence
by age
<1 1-4 5-14 15-44 >45
Incidence studies
Active case finding with RDTs
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Kenema
Kenema District: Gateway
to the Gola Rainforest.
GUINEA
COTE D’IVOREGHANA
TOGO
LIBERIA
SIERRA LEONE
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Single-vector, single injection, bivalent and trivalent rVSVvaccine candidates expressing stabilized LASV GPC and EBOV GP
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In memoriam…
MohamedFullah
Alice Kovoma
Dr S. HumarrKhan
MbaluFonnie
Photo credit: Pardis Sabeti
Photo credit: Kristian Andersen