phylodynamics of the german hiv -1 subtype a and c epidemic · 2017-05-26 · phylodynamics of the...
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Phylodynamics of the German HIV-1 Subtype A and C epidemic AREVIR 06.05.2017 Kirsten Hanke
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Distribution of HIV-1 subtypes worldwide
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The origin and diversity of the HIV-1 pandemic, Hemelaar Trends in Molecular Medicine Volume 18, Issue 3, p182–192, March 2012
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German subtype A epidemic is attributed to two
independent virus variants
Subtype A circulates endemically in Germany
since 30 years
13 German clusters from which 6 are still active
Early infections by Eastern African variant among
MSM and HET (origin in Kenya, Kongo and
Uganda)
1995-2005 strong spread of the Eastern European
variant (AFSU) among PWID
Recent infections mainly by Eastern European
variant especially among German MSM
Most recent transmission clusters are German
MSM clusters formed after 2013
Review Subtype A
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147 RKI samples: 92 MolSurv, 48 SC, 6 DS Sampling period 1992-2016 Reference panel: 442 closely related subtype C sequences retrieved by BLAST
search of the Los Alamos HIV database Bayesian phylogenetic analysis using BEAST v1.8.3 discrete asymmetric
diffusion models to infer epidemiological linkage among geographic regions and transmission groups
Multitype-tree Birth-Death and Birth-Death skyline (BDSKY) analyses (BEAST v2.4) to estimate changes in effective reproduction numbers (Re)
AIM: Characterization of the German Subtype C epidemic (e.g. course of the
epidemic, origin, affected risk groups) Identification and characterization of endemic German clades. Dating of their
first common ancestor in Germany Identification of active clusters showing ongoing transmission events
Analysis of Subtype C
Risk n % HET 73 50,3
MSM 35 24,1 PWID 10 6,9
PPI 2 1,4 X 27 17,2
sum 147 100,0
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Phylogenetic origin of SubC in Germany: at least 2 subepidemics
Southern African clade
Eastern African clade
Brazil
India
Second Eastern African introduction
1963
1968
1966 1975
1972
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Criteria: Clades with posterior probability = 1 At least 3 German subtype C sequences within this clade the common ancestor is estimated to have introduced infection in
Germany
Identification of clades originating in Germany
Criteria: at least two infections have occurred within this clade during the last 3
years
Active clades showing ongoing transmission in Germany
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German SubC clusters 10 German clusters 4 x HET 4 x MSM; 1 x MSM/HET 1 x Mixed PWID
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Phylogenetic origin of German SubC clusters
Southern African clade
Eastern African clade
Brazil
India
Second Eastern African introduction
German SubC clusters
10 German Sub C cluster als bunte Tabelle # size tMRCA subclade origin Risk active
1 13 2010 South Africa ZW, ZM, MZ PWID (HET/MSM) +
2 7 2004 South Africa ZA MSM +
3 5 2008 South Africa FI, NO, ZA, BW MSM -
4 4 1997 South Africa ZM, ZA, ZW HET -
5 4 2007 South Africa BW, ZA HET -
6 3 2012 (South Africa) DRC, MA MSM +
7 3 2014 Eastern Africa BR MSM/HET +
8 9 2007 Eastern Africa BR MSM +
9 3 2002 Eastern Africa TZ, BI HET -
10 3 2005 Eastern Africa ET, SD HET/PPI +
SubC is increasing again in Germany: Estimation of effective reproduction numbers (Re)
HET
MSM
PWID
active inactive
Re Eastern African clade
Re South African clade
Re: estimates the average number of secondary cases per infectious case in a population made up of both susceptible and non-susceptible hosts.
R e
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Subtype C is traditionally transmitted by heterosexual contacts
HET
MSM
PWID
PPI
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Impact of the various transmission routes on the German epidemic
Eastern African subclade
South African subclade
R e R e
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All PWID infected with subtype C in
one cluster cluster 1, 13 individuals 10 PWID, 1 MSM, 1 HET, 1 unknown 11 male, 2 female (both PWID) 26-42 years old Nationality: 10 DE, 1 GR, 1 LV, 1 KZ Country of infection: Germany First registered infection in Germany:
03/2015 10 individuals sampled between
02-05/2016 tMRCA 2010 or 2015, respectively Area of living: Munich (and Augsburg)
Strong increase of PWID mediated infections in I/2016
Risk
PWID HET MSM
2010 2015
Transmitted SDRM
559; 94%
5; 1% 17, 3%
10, 2% 1 1
34; 6%
SDRM in all samples (n=589)
Sensitive PI NNRTI NRTI PI/NNRTI NNRTI/NRTI
134; 90.5%
3; 2.0%
8; 5.4%
2; 1.4% 1; 0.7%
14; 9.5%
SDRM of RKI samples only (n=147)
Sensitive PI NNRTI NRTI PI/NNRTI
No accumulation of SDRM in German subC clusters
NNRTI SDRM NRTI SDRM PI SDRM
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German subtype C epidemic is attributed to two
independent virus variants
10 German clusters from which 6 are still active
Early infections (until early 1990s) mainly by HET
transmission (both clades)
1993-2007 drop in subtype C infections
Since 2007 strong increase of infections in both
subclades especially for MSM (but also HET)
Until 2005 no transmission among PWID observed
strong increase in one transmission cluster within
South African subclade in I/2016
Among active clusters are 4 MSM clusters, 1 PWID
cluster and 1 HET cluster (infections occurred in
Ethiopia)
MSM clusters in Eastern African subclade are
phylogeographically linked with epidemic in Brazil
Spread of Subtype C to Germany
Brazil
South Africa
DRC
Ethiopia
India
Germany
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Subtype A Subtype C
Phylogenetic origin of German epidemic
Eastern Africa & Central/Western Africa + FSU
Eastern Africa (in part via Brazil) & Southern Africa
tMRCA (95% HPD) 1953.6 (1951.2-1965) 1963.6 (1956-1967.6)
# of German clusters 13 10
# of active clusters 6 6
Risk groups cluster (HET/MSM/PWID)
6 HET, 5 MSM, 2 mixed PWID 4 HET, 4 MSM, 1 mixed HET/MSM, 1 PWID
Risk groups current epidemic (clusters)
1 HET, 3 MSM, 2 PWID
1 HET, 4 MSM, 1 PWID
TDR in clusters PI TDR in 2 MSM clusters No cluster associated TDRs
Sequences analyzed 183 (in total 743) 147 (in total 589)
Comparison with SubA epidemic
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Similar analyses with other nonB subtypes (G, F, CRF01AE and CRF02AG)
Huge subtype B analysis 1983-2017: >5000 sequences
Outlook
Diagnostic labs: InzSurv/MolSurv HIV-1 Seroconverter
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Andrea Hauser Claudia Kücherer Karolin Meixenberger Norbert Bannert
Acknowledgments
Barbara Gunsenheimer-Bartmeyer Viviane Bremer Alexandra Hofmann Daniel Schmidt
RKI – Unit HIV and other Retroviruses
RKI - Unit HIV/AIDS, STI and Blood-borne Infections
Bioinformatics Denise Kühnert, Zürich Nuno R. Faria, Oxford Oliver Pybus, Oxford Max von Kleist, Berlin Kaveh Youssef, Berlin
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ancestral subtype C strain of HIV-1 migrated from Kinshasa to the southern provinces of the Democratic Republic of the Congo (DRC) migration occurred via major rail networks connecting Kinshasa with southern DRC
ancestral subtype C strain of HIV-1 was introduced into the southern Katanga region of the DRC in the late 1930s (95% HPD 1919 – 1957) then spread independently to east and southern African respectively
tMRCA of the southern African HIV-1 subtype C epidemic at around 1960 (95% HPD 1956 – 1964), with similar estimates for individual countries within the region
large number of infections were introduced into South Africa via foreign migrants from other southern African nations during the 1970s and 80s
strong periods of epidemic growth during the 1970s and 1980s for the southern African epidemic. The origin of the subtype C epidemic in the region can be placed around 1960 (95% HPD 1956 –
1964) with strong periods of epidemic growth during the 1970s and 80s for the southern African region and during the 1980s and 90s for South Africa. The periods of strong epidemic growth coincide with periods of socio-political changes in the region during the latter part of the 20th century. The results from the phylogenetic reconstruction support that migration played an important role in facilitating the introduction and spread of the virus throughout the region and in South Africa in particular. Furthermore, the usage of older sequences provided more accurate estimates of the origin and rate of growth of the epidemic than previous subtype C studies, which used mostly contemporary sequences, further reducing uncertainty in our estimates. (Wilkinson 2015 http://www.nature.com/articles/srep16897)
a substantial proportion of subtype C infections in east Africa resulted from dissemination of a single HIV local variant, probably originated in Burundi during the 1960s. Burundi was the most important hub of dissemination of that subtype C clade in east Africa, fueling the origin of new local epidemics in Ethiopia, Kenya, Tanzania and Uganda. Subtype C lineages of southern African origin have also been introduced in east Africa, but seem to have had a much more restricted spread (Delatorre & Bello, 2012 https://www.ncbi.nlm.nih.gov/pubmed/22848653)
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