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    Hidden Killers: Human Fungal InfectionsGordon D. Brown et al.Sci Transl Med 4, 165rv13 (2012);DOI: 10 .1126/scitranslmed.3004404

    A complete electronic version of this a rticle and o ther services, including h igh-resolution gures,can be found at: http://stm.sciencemag.org/content/4/165/165rv13.full.html

    Supplementary Material can be found in the online version of this a rticle at: http://stm.sciencemag.org/content/suppl/2012/12/17/4.165.165rv13.DC1.html

    Related Resources f or this a rticle can be found online at: http://stm.sciencemag.org/content/scitransmed/2/15/15cm3.full.html http://stm.sciencemag.org/content/scitransmed/3/69/69cm3.full.html http://stm.sciencemag.org/content/scitransmed/4/149/149fs32.full.html http://stm.sciencemag.org/content/scitransmed/3/69/69cm4.full.html

    Information about obtaining reprints o f this article or ab out obtaining permission to reproduce thisarticle in whole or in part can be found at: http://www.sciencemag.org/about/permissions.dtl

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    D o w n l o a d e d f r o m

    s t m . s c i e n c e m a g . o r g

    o n D e c e m b e r 2 0 , 2 0 1 2

    Science Translational Medicine (print ISSN1946-6234; online ISSN 1946-6242) ispublished weekly, except t he last week inDecember, by the American Association for theAdvancement of Science, 1200 New YorkAvenue N W, Washington, DC 20005. Copyright2012 by the American Association for t heAdvancement of Science; all rights r eserved.The title Science T ranslational Medicine is a

    registered trademark o f AAAS.

    http://stm.sciencemag.org/http://stm.sciencemag.org/http://stm.sciencemag.org/http://stm.sciencemag.org/http://stm.sciencemag.org/http://stm.sciencemag.org/http://stm.sciencemag.org/http://stm.sciencemag.org/http://stm.sciencemag.org/http://stm.sciencemag.org/http://stm.sciencemag.org/http://stm.sciencemag.org/http://stm.sciencemag.org/http://stm.sciencemag.org/http://stm.sciencemag.org/http://stm.sciencemag.org/http://stm.sciencemag.org/http://stm.sciencemag.org/http://stm.sciencemag.org/http://stm.sciencemag.org/
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    R E V I E W

    M E D I C A L M Y C O L O G Y

    Hidden Killers: Human Fungal Infec i!nsG!rd!n D" #r!$n% &' Da(id W" Denning% ) ' *eil A" R" G!$% &' + uar M" Le(i ,%- 'Mi.ai G" *e ea% / ' 0.e!d!re C" W.i e 1'

    Al .!ug. fungal infec i!ns c!n ri2u e su2s an iall3 ! .uman m!r2idi 3 and m!r ali 3% .e im4ac !f .ese dis5eases !n .uman .eal . is n! $idel3 a44recia ed" M!re!(er% des4i e .e urgen need f!r efficien diagn!s ic

    es s and safe and effec i(e ne$ drugs and (accines% researc. in ! .e 4a .!4.3si!l!g3 !f .uman fungalinfec i!ns lags 2e.ind .a !f diseases caused 23 ! .er 4a .!gens" In .is Re(ie$% $e .ig.lig. .eim4!r ance !f fungi as .uman 4a .!gens and discuss .e c.allenges $e face in c!m2a ing .e de(as a ingin(asi(e infec i!ns caused 23 .ese micr!!rganisms% in 4ar icular in immun!c!m4r!mised indi(iduals"

    I*0ROD6C0IO*It is widely accepted that fungal pathogens have anenormous in-fluence on plant and animal life.Indeed, a recent report detailed the extraordinary andfrightening impact of these pathogens on speciesextinctions, food security, and ecosystemdisturbances (1). In contrast, the effect fungalinfections have on human health is not widely recog-nized ( able 1), and deaths resulting from theseinfections are often overloo!ed. "or example, the#orld $ealth %rganization has no program on fungalinfection, and most public health agencies 7 with thesingular exception of the &.'. enters for isease

    ontrol and *re-vention ( ) 7 conduct little or nomycological surveillance. +ost people in their lifetimes will suffer from superficial fungalinfections that are generally easy to cure, butmillions of individuals worldwide will contract life-threatening invasive infections that are much harder to diagnose and treat ("ig. 1).

    %f particular concern is the high rate of mortalityassociated with invasive fungal infections, which oftenexceeds despite the availa-bility of severalantifungal drugs ( able 1). he purpose of this /eviewis to estimate, from available scattered data, the disease

    burden caused by these pathogens0 describe the typesand impact of fungal infections worldwide0 andillustrate the pressing need for more research in thisfield to facilitate the development of better diagnostictests and therapies and of as yet unrealized preventativevaccines. Indeed, funding for med-ical mycology isgreatly underrepresented when compared to other in-fectious diseases, although this may also reflect thenumber of applications for funding in the area. "or

    example, from the total spent over the last years onimmunology and infectious disease research by the#ellcome rust (a &. . charitable body), the &. .+edical /e-search ouncil, and the &.'. 2ationalInstitutes of $ealth (2I$), only 1.3 to 4. wasallocated specifically to medical mycology.

    F6*GI A*D H6MA* DI+EA+E

    'uperficial infections of the s!in and nails are the mostcommon fun-gal diseases in humans and affect 54(or 51.6 billion) of the general

    & A2erdeen Fungal Gr!u4% Ins i u e !f Medical +ciences% 6ni(ersi 3 !f

    A2erdeen% A2erdeen A#)1 )8D% 6K") *a i!nal As4ergill!sis Cen re Educa i!nand Researc. Cen re% 6ni(ersi 3 H!s4i al!f +!u . Manc.es er% Manc.es er M)-9L0% 6K" - De4ar men !f Medicine%6ni(ersi 3 !f Massac.use s Medical+c.!!l% W!rces er% MA &; 1% 6+A"/ De4ar men !f In ernal Medicine and .e*i

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    h are the second most numerous agents of fungalinfection worldwide.

    Invasive fungal infections have an incidence thatis much lower than superficial infections, yetinvasive diseases are of greater concern because theyare associated with unacceptably high mortalityrates. +any species of fungi are responsible for theseinvasive infections, which !ill about one and a half million people every year. In fact, at least as many, if not more, people die from the top 1 invasive fungal

    diseases ( able 1) than from tuberculosis ( ryptococcus, andida, ;spergillus,and*neumocystis. $owever, epidemiological data for fungal infections are notoriously poor because fungalinfections are often misdiag-nosed andcoccidioidomycosis (also sometimes called valleyfever ) is the only fungal disease that must bereported to the . he sta-tistics presented in

    able 1 have been largely extrapolated from the few(mostly geographically localized) studies that have

    been performed (also see 'upplementary +aterials)and are undermined by the lac! of accurate incidencedata from many parts of the developing world. on-se?uently, our calculations may significantlyunderestimate the true burden of invasive fungaldiseases.

    he immune system of healthy individuals haseffective mecha-nisms for preventing fungalinfections, and the current incidence of invasivediseases is largely a result of substantial escalationsover the last few decades in immunosuppressiveinfections, such as $I9:;I ',

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    R E V I E W

    and mod

    er n immunosu

    p p

    r e

    ssiveandinvasivemedical

    interventions."or example,thevastma

    @ori

    tyof

    patientswithcr yptococ

    cosis7for whichwehavecom

    parative

    lystr

    on

    Fig" &" Remar>a2le fungal infec i!ns" ?0!4% lef ! rig. @ C.r!nic muc!cu ane!us candidiasis% c.r!5m!2las !m3c!sis% and mucicarmine5s ained .is !l!gical sec i!n !f .e cere2ellum !f an AID+ 4a ien$.! died fr!m cr34 !c!ccal mening!ence4.ali is ?dem!ns ra ing an a2undance !f 4in>5s ained fungi@"?#! !m@ C!m4u ed !m!gra4.3 ?C0@ scan !f .e lungs !f a 4a ien s.!$ing a large fungal 2all?as4ergill!ma% 2lac> 2! @% $.ic. $as surgicall3 rem!(ed ?rig. @" 0.ree smaller ca(i ies are als! (isi2lein .e C0 scan ?red arr!$s@% $.ic. is 34ical !f c.r!nic 4ulm!nar3 as4ergill!sis"

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    1 million

    cases,with mor

    e than ines

    .a

    4r

    !(ide

    .e

    !ler ance mec.anisms

    necessar 3

    ! 2al

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    ance inf lamma

    i!n and

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    can d!$n5r egula

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    $ $$

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    R E V I E W

    human h

    ost("ig.4).%ne

    pr ominent

    br ea

    ! thr ough wasan

    a

    p pr eciation

    of theimportanceof innate-immune

    oll-li!ereceptors( A/s)inan-timicro

    bialhostdef ense.

    A/swer eoriginallyide

    ntif iedinfruitflies asessentialcomponents

    for thedevelo

    pmentof resistancetoinfection

    with;spergillus(andlater ,other fungi).

    hediscover y of

    A/sas!ey

    playersinhum

    aninnateimmunity

    broughttheseso-called

    patt

    ernrecognitionrece

    p-

    tor s (*/

    / s) to the att

    Fig" -" Diagn!s ic dilemma" A re4resen a i(e clinical scenari! .a dem!ns ra es .e magni ude !f 4r!2lemsass!cia ed $i . .e diagn!sis !f fungal infec i!ns $i . curren diagn!s ic !!ls" 0.e figure s.!$s .e diagn!s icc!nsidera i!ns% s ar ing $i . .e !rgan .a ma3 2e in(!l(ed ?inner circle@% .e m!s li>el3 diagn!ses ?middlecircle@% and .e es ing reJuired ! rule in !r !u eac. !f .ese diagn!ses ?!u er circle@" Cer ain fea ures !f .eillness ma>e s!me diagn!ses muc. m!re !r less li>el3% in 4ar icular% .e 4a ien Bs ra(el .is !r3 and s>in4a4ule% $.ereas ! .er a2n!rmali ies are n!ns4ecific" 0.e 4a ien is a 1-53ear5!ld man ?4.! !gra4. dis4la3edunal ered% $i . 4ermissi!n fr!m 4a ien @ admi ed af er .a(ing 2een increasingl3 un$ell f!r & da3s des4i eadminis ra i!n !f !ral an i2i! ics" He .as a 4re(i!us .is !r3 !f 4neum!nia ?) 3ears earlier@% is a - 4ac> 4er 3ear sm!>er% and a>es &1 mg !f 4rednis!l!ne ?a c!r5 ic!s er!id@ and 1 mg !f a,a .i!4rine ?animmun!su44ressi(e agen @ f!r in ers i ial lung disease" He .as ra(eled e ensi(el3 in .e 6ni ed + a es%s!u .ern Eur!4e% and .e Middle Eas " On admissi!n% .e .ad a fe(er !f - "- C% $as slig. l3 c!nfused 2u full3c!nsci!us% .ad ! 3gen sa ura i!ns !f 9/ % .ad a 2l!!d 4ressure !f 91 ; ?l!$@% .ad a ne$ n!nulcera ed dar>4a4ule !n .is rig. l!$er arm & cm acr!ss% and .ad n!ns4ecific general $.ee,ing in .is c.es " He .ad aslig. l3 raised $.i e 2l!!d cell c!un $i . neu r!54.ilia% a raised serum crea inine indica i(e !f significan l3im4aired renal func i!n% and nega i(e 2l!!d cul ures" *ine m!n .s earlier% an HIV an i2!d3 es .ad 2een4erf!rmed f!r em4l!3men 4ur4!ses and $as nega i(e" His c.es radi!gra4. s.!$ed slig. l3 increased.a,iness 2ila erall3 and s.!$ed n! im4r!(e5men af er -; .!urs !f rea men $i . 2r!ad5s4ec rum an i2i! ics"

    HO0O CREDI0: G" WHI0EH6R+0

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    ention of

    the entir e scientif ic community and

    2o

    bel

    pr izes in +ed

    icine to s

    cientists Eules $of f man and Dr uce Deutler

    in 4

    11. "ung

    al r ecogni

    tion

    by the innate immune system also led

    to the discov

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    er y of ano

    ther class of mammalian */ / s, the

    -ty

    pe

    lectin r ece

    pto

    r s (

    A/ ),

    as well as the identif ication of new intr

    a-cellular sig

    naling

    pat

    hways modulated

    by

    A/ s (3=). It tur ns ou

    t that ther e a

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    r e hun-dr e

    ds of

    A/ s

    but only 11

    A/ s encoded

    by th

    e human genome

    . 'o it is

    not sur -

    pr ising that

    A/ s ar e now r ecogn

    ized to

    play a

    pr edomina

    nt r ole in antif ungal im-munity (

    ). In

    humans, def ici

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    encies and

    polymor

    phisms in

    both */ / systems wer e s

    u bse?uently f o

    und to cau

    se susce

    pti

    bility to a r ange of f ungal in

    f ections (

    1).

    %ur under standing of ada

    p

    tive im-munity has also

    benef ited f r om the

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    r esear ch on antif ungal ho

    st def ense. ;lthough scientists had f unctio

    nally divided the di-ver s

    e

    po

    pulation of immune-r egulator y

    3F

    he

    l per (

    $

    )

    cells in humans into

    $

    1 cells (cr itical f o

    r

    pr otective an

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    tif ungal immunity) and

    $

    4 cells (gener

    ally non-

    pr otective dur ing f u

    ngal inf ections),

    $

    16 cells wer e ident

    if ied only r ecently in the co

    ntext of autoimmune disea

    ses.

    $

    16 cell

    s ar e now r ecognized to

    play

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    essen-tial r oles in

    pr ote

    ctive antif ungal im-munity at mucosal sur f a

    ces such as in the lungs

    and mouth. Indeed, genetic def ects in

    $

    16

    r es

    ponses r ender

    patients

    susce

    pti

    ble to chr onic mucosal f ungal inf e

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    ctions, such as occur s in

    hy

    per immu-noglo

    bulin B syndr ome, which r es

    ults f r om mutations in th

    e gene ('

    ;

    7) that encodes the signal tr an

    sducer and activa-tor of

    tr anscr i

    ption 7 ('

    ;

    7)

    pr otein (

    4), or in

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    autosomal dominant chr on

    ic mucocutaneous candidiasis, caused

    by mu-

    tations in the '

    ;

    1 gene

    (

    7,

    3) ("ig. 1). $owever , unli! e f or oth

    er

    pathogens, the

    br oader

    identif ication of f actor s that con-tr i

    bute

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    to f ungal susce

    pti

    bility

    7f or exam-

    ple, thr ough genome-wide associat

    ion studies7has

    been ham

    p

    er ed

    by the lac! of lar ge

    patient cohor ts.

    ;lthough w

    e have made signif icant adv

    ances in our under standing

    o

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    f the unde

    r lying mechanisms of

    pr otec

    tive

    immunity,

    par ticular ly to invasive inf ections with ;s

    per gillus,

    andi-da,

    and

    r y

    ptococc

    us, ther e r emains much to

    be lear ned. "or

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    exam

    ple, t

    her e ar e still

    no antif ungal vaccines, and we ! now littl

    e a

    bout th

    e immuno

    pathol

    ogical

    pr ocesses of the common noninvasive

    f ungal in

    -f ections, suc

    h as r ecur r ent vulvovaginal candidiasis or

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    der mato

    ph

    yto-sis. +or eo

    ver , little is ! nown a

    bout immunity to mos

    t other f u

    ngal

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    R E V I E W

    pathoge

    ns,es

    pecially

    emer ging

    pathogens (such as the less-commo

    nfilamentousfungi)and

    endemicdiseasesindevelopingcount

    riessuchas

    par acoccidioidomycosis.

    h

    e potentialroleof fungal

    pathogensin

    theimmune

    pathologyof inflammator y

    andautoimmunedis

    eases7for exam

    ple,

    r ohnBsdis

    ease,sar coidosis,colitis(

    ),and

    arthritis7alsore-?uiresattention

    byscientists.

    CLI*IC

    AL

    A

    R+%n

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    exam

    ple,a

    blood cultur e hasa sensitiv

    ity of 5

    f or invasive cand

    idiasisand

    for invasiveaspergi

    llosis.;lthoughtheidentif icationof someinfec-tions isrelativelystraightfor war d7such as

    thedetectionof cry

    ptococcalantigens inthe

    bloodandcer ebr ospinalfluidusinganew

    pointof car edipstic! test( s!u!f

    .e!44

    !runis ic2!"*a"Re("Micr!2i!l"9%&9-

    ) -?)

    &&@"

    1

    1

    8.C"

    Ma3%N"Heiman%Emer gence and 4a

    .!g

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    gen!34esin

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    11

    . N"R"Har ris%+"R"L!c>.ar%E"De2ess%*"Mar sde

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    l2l!!ds

    r eam inf ec

    i!ns in 6+

    .!s4i

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    Anal3s

    is !f )/%&

    9 cases f r !m a 4r !s4ec

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    r % D" N" Die>ema% E4idemi!l!g3 !f in(asi(e candidiasis:

    A 4er sis

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