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COVID-19Pandemic

LessonsfromtheFrontline

COVID-19Pandemic LessonsfromtheFrontline

JorgeHidalgo

GeneralICUandCOVID-19Unit,BelizeHealthcarePartner, BelizeCity,Belize

GloriaRodrı´guez-Vega

DepartmentofCriticalCareMedicine,HIMASanPablo, Caguas,PuertoRico

JavierPerez-Ferna ´ ndez

IntensiveCareSolutions,CriticalCareServices,Baptist Hospital,Miami,FL,UnitedStates

Elsevier

Radarweg29,POBox211,1000AEAmsterdam,Netherlands TheBoulevard,LangfordLane,Kidlington,OxfordOX51GB,UnitedKingdom 50HampshireStreet,5thFloor,Cambridge,MA02139,UnitedStates

Copyright©2022ElsevierInc.Allrightsreserved.

Nopartofthispublicationmaybereproducedortransmittedinanyformorbyanymeans,electronicor mechanical,includingphotocopying,recording,oranyinformationstorageandretrievalsystem,without permissioninwritingfromthepublisher.Detailsonhowtoseekpermission,furtherinformationabout thePublisher’spermissionspoliciesandourarrangementswithorganizationssuchastheCopyright ClearanceCenterandtheCopyrightLicensingAgency,canbefoundatourwebsite: www.elsevier.com/ permissions.

ThisbookandtheindividualcontributionscontainedinitareprotectedundercopyrightbythePublisher (otherthanasmaybenotedherein).

Notices

Knowledgeandbestpracticeinthisfieldareconstantlychanging.Asnewresearchandexperiencebroaden ourunderstanding,changesinresearchmethods,professionalpractices,ormedicaltreatmentmay becomenecessary.

Practitionersandresearchersmustalwaysrelyontheirownexperienceandknowledgeinevaluatingand usinganyinformation,methods,compounds,orexperimentsdescribedherein.Inusingsuchinformation ormethodstheyshouldbemindfuloftheirownsafetyandthesafetyofothers,includingpartiesforwhom theyhaveaprofessionalresponsibility.

Tothefullestextentofthelaw,neitherthePublishernortheauthors,contributors,oreditors,assumeany liabilityforanyinjuryand/ordamagetopersonsorpropertyasamatterofproductsliability,negligenceor otherwise,orfromanyuseoroperationofanymethods,products,instructions,orideascontainedinthe materialherein.

LibraryofCongressCataloging-in-PublicationData

AcatalogrecordforthisbookisavailablefromtheLibraryofCongress

BritishLibraryCataloguing-in-PublicationData

AcataloguerecordforthisbookisavailablefromtheBritishLibrary ISBN:978-0-323-82860-4

ForinformationonallElsevierpublicationsvisitour websiteat https://www.elsevier.com/books-and-journals

Publisher: DoloresMeloni

AcquisitionsEditor: CharlottaKryhl

EditorialProjectManager: MonaZahir

ProductionProjectManager: NiranjanBhaskaran

CoverDesigner: AlanStudholme

TypesetbySPiGlobal,India

Wededicatethisbooktoallfrontlineworkers.Yourlessonshave shownusthatweareallinthistogether.

JorgeHidalgo,GloriaRodrı´guez-Vega,and JavierPerez-Ferna ´ ndez

AlexisU.MacDonald,JohnM.Harahus,ErinHall, MaryJaneReed,andMarieR.Baldisseri

CHAPTER7COVID-19andriskexposureofthefrontline: Heroesormartyrs? ..................................................... 79

MariliaDı ´ az

CHAPTER8COVID-19andsocialmedia ....................................... 85

PatxiPerezFerna ´ ndezandMiguelMorenoArı´ztegui

Introduction...................................................................................85

Thedigitaltransformationofthemedia.Acompromised quality?..........................................................................................86

Paywalls.................................................................................87

Socialmediaandhoaxes.......................................................88

Thevalueoftrueinformation......................................................89

Toolsagainstfalseinformation.............................................90

Policiesandregulations.........................................................91

Scientificsourcestoverifyinformation.......................................92

Thedigitalandtechnologicalplatformsandthepower ofthenetworks.............................................................................94

Thepoliticians’influence......................................................95

Howtocontrolthemediaandinformation..................................95 References.....................................................................................96

CHAPTER9COVID-19andtheroleofmedicalprofessional societies...................................................................... 99

DrewFarmer,JosePascual,andLewisJ.Kaplan

Introduction...................................................................................99

Medicalprofessionalorganizationtypes......................................99

Memberbenefits.........................................................................100

SARS-CoV-2andmedicalprofessionalorganizations..............102 Conclusion..................................................................................105 References...................................................................................106

CHAPTER10NoveltreatmentsandtrialsinCOVID-19 ................. 109

AndrewConwayMorrisandAllisonTong Therapeuticapproaches..............................................................109

Antivirals.............................................................................110

RNA-dependentRNApolymeraseinhibitors.....................110 Proteaseinhibitors...............................................................110

Antimalarials........................................................................110

Antibiotics............................................................................111

Convalescentplasmaandimmunoglobulins.......................111 Antiinflammatories..............................................................111

Immunomodulatorytherapies..............................................112

CHAPTER13Politicsandthepandemic ....................................... 137

MichaelSingh

References...................................................................................146

CHAPTER14Theeffectsofthepandemiconoilservicesand shippingindustry 147

WilliamG.MacDonald

Introduction.................................................................................147

Theoilindustryandshipping.....................................................148

TheeffectsofCOVID-19onoilservices,oillogistics, andshippingindustries...............................................................148

Economicimpactofthelockdownonoilservices, oillogistics,andshippingindustry............................................149

Theeffectoftheoilglutontheworld.......................................149

Thefuture...................................................................................150

Disclaimer...................................................................................150

References...................................................................................150

CHAPTER15MillennialsandCOVID-19 ........................................ 153

BenjaminHidalgo,GeraldMarı´n-Garcı ´ a, EdwinWu,andAllysonHidalgo

Personalexperience,conversationswithapost-COVID-19 patient,andsomequestionstothinkabout................................153

MillennialsandtheCOVID-19pandemic.................................160

Perspectivefromanavidtrainee.........................................160

CHAPTER16COVID-19:Datacollectionandtransparency amongcountries ....................................................... 163

ErwinCalgua

Introduction.................................................................................163

LessonslearnedaboutCOVID-19datacollection....................164

LessonslearnedaboutCOVID-19datatransparency................165

Whatcouldbeimplementedtoimprovedatacollection forCOVID-19.............................................................................166

Whatcouldbeimplementedtoimprovedatatransparency forCOVID-19.............................................................................169

Conclusion..................................................................................170

References...................................................................................170

CHAPTER17BrazilianbattleagainstCOVID-19 ........................... 173

FernandoSuparreguiDias,RegisGoulartRosa,and CiroLeiteMendes

Whenandhowdidthesevereacuterespiratorysyndrome coronavirus2pandemicbegininBrazil?..................................173

Psychologicalburdens................................................................201

CHAPTER20COVID-19pandemicinIndia .................................... 205

KapilZirpeandSushmaGurav

Othermeasures...........................................................................207

Pitfallsofourapproach..............................................................208 Futureplan..................................................................................209

CHAPTER21LifeafterCOVID-19:Futuredirections? 211

PravinAmin

Introduction.................................................................................211 Earlierpandemics.......................................................................212

Contributors

PravinAmin

BombayHospitalInstituteofMedicalSciences,Mumbai,India

MiguelMorenoArı´ztegui Advisor,ThePresidentoftheGovernmentofNavarra,Pamplona,Spain

MarieR.Baldisseri

DepartmentofCriticalcareMedicine,UniversityofPittsburghMedicalCenter, GlobalHealthandDisasterMedicine,Pittsburgh,PA,UnitedStates

NataliaLargaespadaBeer MinistryofHealth,Belmopan,Belize

ErwinCalgua

ResearchCenterofHealthSciences,SchoolofMedicine,UniversityofSanCarlos ofGuatemala,GuatemalaCity,Guatemala

Marı´aCruzMartı´nDelgado IntensiveCareUnit,HospitalUniversitariodeTorrejo ´ n;UniversidadFranciscode Vitoria,Madrid,Spain

FernandoSuparreguiDias

HeadCriticalCareDepartment,HospitaldoCirculo,CaxiasdoSul,RS,Brazil

MariliaDı ´ az HospitalAuxilioMutuo;UniversidadSagradoCorazo ´ n,SanJuan,PuertoRico

DrewFarmer

PerelmanSchoolofMedicine,UniversityofPennsylvania,DivisionofTrauma, SurgicalCriticalCareandEmergencySurgery,Philadelphia,PA,UnitedStates

PatxiPerezFerna ´ ndez

President,TheAssociationofJournalistsofNavarra,Pamplona,Spain

DanielGodinez InternalMedicine,BelizeHealthcarePartnersLimited,BelizeCity,Belize

DeepaB.Gotur

DepartmentofMedicine,HoustonMethodistHospital,Houston,TX;WeillCornell Medicine,NewYork,NY,UnitedStates

SushmaGurav

RubyHallClinic,Pune,Maharastra,India

ErinHall DepartmentofTraumaSurgery,GeisingerMedicalCenter,Danville,PA,United States

JohnM.Harahus

GeisingerBiocontainmentUnit,GeisingerMedicalCenter,Danville,PA,United States

AllysonHidalgo

Biochemistry,ArizonaStateUniversity,Phoenix,AZ,UnitedStates

BenjaminHidalgo HealthScience,Phoenix,AZ,UnitedStates

JorgeHidalgo

GeneralICUandCOVID-19Unit,BelizeHealthcarePartner,BelizeCity,Belize

StevenH.Hsu

DepartmentofMedicine,HoustonMethodistHospital,Houston,TX;WeillCornell Medicine,NewYork,NY,UnitedStates

LewisJ.Kaplan

PerelmanSchoolofMedicine,UniversityofPennsylvania,DivisionofTrauma, SurgicalCriticalCareandEmergencySurgery,Philadelphia,PA;SocietyofCritical CareMedicine,MountProspect,IL,UnitedStates

RyanJ.Logue

DepartmentofMedicine,HoustonMethodistHospital,Houston,TX,United States

DeenaLynch

Brisbane,QLD,Australia

AlexisU.MacDonald

DepartmentCriticalCareMedicine,GeisingerMedicalCenter,Danville,PA, UnitedStates

WilliamG.MacDonald

TheBritishEastIndiaCompanyLimited,Birkenhead,Merseyside,United Kingdom

GeraldMarı´n-Garcı ´ a CriticalCare-EmergencyMedicinePhysician,VACaribbeanHealthcareSystem, SanJuan,PuertoRico

CiroLeiteMendes

HeadIntensiveCareUnit,HospitalLauroWanderley,UniversidadeFederalda Paraı´ba;HeadIntensiveCareUnit,HospitalNossaSenhoradasNeves, JoaoPessoa,PB,Brazil

AndrewConwayMorris

DivisionofAnaesthesia,DepartmentofMedicine,UniversityofCambridge; JohnVFarmIntensiveCareUnit,Addenbrooke’sHospital,Cambridge, UnitedKingdom

ObashinaOgunbiyi

IntensiveandCriticalCareSocietyofNigeria,BeninCity,Nigeria

JosePascual

PerelmanSchoolofMedicine,UniversityofPennsylvania,DivisionofTrauma, SurgicalCriticalCareandEmergencySurgery,Philadelphia,PA,UnitedStates

LornaPerez

MinistryofHealth,Belmopan,Belize

JavierPerez-Ferna ´ ndez

IntensiveCareSolutions,CriticalCareServices,BaptistHospital,Miami,FL, UnitedStates

MaryJaneReed

GeisingerBiocontainmentUnit,GeisingerMedicalCenter,Danville,PA,United States

GloriaRodrı´guez-Vega

DepartmentofCriticalCareMedicine,HIMASanPablo,Caguas,PuertoRico

RegisGoulartRosa

IntensiveCareUnitandResearchProjectsOffice,HospitalMoinhosdeVento, PortoAlegre,RS,Brazil

MichaelSingh

OfficeofthePrimeMinisterofBelize,Belmopan,Belize

JacquelineY.Steuer

ManagerCriticalCareServicesAPNteam;NorthShoreUniversityHealthSystem, Evanston,IL,UnitedStates

RishiSuresh

TexasA&MSchoolofMedicine,CollegeStation,TX,UnitedStates

AhmedRedaTaha

ClevelandClinicLernerCollegeofMedicine,CaseWesternReserveUniversity, CriticalCareInstitute,ClevelandClinicAbuDhabi,AbuDhabi,UnitedArab Emirates

AllisonTong

SydneySchoolofPublicHealth,TheUniversityofSydney,Sydney,NSW, Australia

LailaWoc-Colburn

DivisionofInfectiousDiseases,EmoryUniversitySchoolofMedicine,Atlanta,GA, UnitedStates

EdwinWu

IntensiveCareSolutions,BaptistHospital,Miami,FL,UnitedStates

KapilZirpe

RubyHallClinic,Pune,Maharastra,India

Preface

Bytheendof2019,theworldwitnessedtheappearanceofanewstrainofviruscausingrespiratoryandsystemicillnessintheregionofWuhan,China.Progressively, mediaattentiongrewtothatareaandnewswerebeingwatchedwithconcernby someandskepticismbyothers.However,itwasnotuntilthelatestFebruaryand thebeginningofMarch2020,whentheinfectionspreadtoEuropeandtheUnited States,thattheworldstartedtofocusattentiontothisdisease.Eventhen,themedia andpublicopinionweredividedintotheneedsorappropriatenessoftheresponses thatdifferentcountriesweredevelopingabouttheconvenienceofborderclosuresor theimplementationofquarantinefortravelersorevenclosecontacts.

Theyearof2020hasbeenonethathumanitywillrecallasa“darkone,”notonly bytheCOVID-19pandemicbutalsobytheerratic,disorganized,andsometimes misdirectedresponseofpublicauthorities,media,andprivateindividuals.Aconglomerateofopinions,thelackofevidencetoformulatehealth-carepoliciesand responses,andthefeelingoftheabsenceofinternationalcooperationhavebeen themarkersofthisyear.Theserepresentamotivetolearnandevolveforfuture eventstocome.

LessonsfromtheFrontLine exploressomefirst-handexperiences,fromthose whohavebeeninvolvedinthisfight,inthefirstlineoftheresponse,fromthose whohavesufferedthedisease,andfromthosewhohavebeenaffecteddirectlyor indirectlybytheCOVID-19andwhoseliveshaveabruptlychanged.Withtheexperiencesandopinionsreflectedonthebook,wewouldliketomakeacallforattention tosomeaspectsthatneedseriousimprovementtocopewithfuturedisasters,hopefullynottobeseensoon.

Wehaveexploredtheimpactofthepandemicintotheeconomywiththepolitical ramificationsthathavebeeninvolvedinsomepoliciesinvokedinthenameofhealth butquestionableintheirmotivesandimplementations.Wehavealsoreflectedthe experiencefromthosewhohaveworkedfrontline,theiropinions,theirsorrows, andtheirsuggestionsonhowtoimproveourhealth-caresystemlocally,regionally, andbeyondborders.Weechoedthethoughtsofthosewhohavesufferedthedisease andrenderedtheirinsidefeelingsintothesepages.Wehaveconveyedthevoiceof mediaprofessionals,concernedabouttheerraticandsometimesmisleadinginformationappearingeverywherewithaspecialmentiontosocialmediathathasrevealed anincrediblevaluefortrueandfakenews.Finally,wehaveincorporatedthevoiceof theprofessionalsocietiesandadministrationsinanattempttoconsolidateandorganizefutureefforts.

Webelievethatthe LessonsfromtheFrontLine isawindowdisplayofthejourneythattheworldhasengagedin2020,ayearthatbroughtupchallenges,confusion,

deception,andthegreatestspiritofmankind.We,theeditors,believethathumanity haslearntfromourmistakesandthattheyear2020hasmadeusstronger,andwesee inalltheseprocessesaglimmerofhopeforourhumanrace.Togetherwefight, togetherwewin.

JavierPe ´ rez-Ferna ´ ndez,MD

JorgeHidalgo,MD

GloriaRodrı´guez-Vega,MD

Acknowledgments

Specialthankstothedifferentauthorsfortakingthetimetopreparethesechapters; despitehecticschedulesandbusylives,thecompletionofthisundertakingcouldnot havebeenpossiblewithoutyourvaluablecontribution.Wewanttorecognizethe greatcontributionofPilarRamo ´ nPardoandPAHOWashington.

WewanttoofferaspecialthankstotheguidanceprovidedbyElsevierStaff, especiallytoMonaZahir,theeditorialprojectmanager,foryourpatienceandyour dedicationtothisprojecthasbeenhelpful,andwefeelfortunatetohavehadthe opportunitytoworktosuchaprofessionalgroup.

Thankstoourfamiliesfortheirunconditionalsupportandencouragement.Itis noteasytoexpressourgratitudeforallyourincrediblepatienceandunderstanding. Theyareaconstantreminderofwhatistrulyimportantinlife.

Thesuddenappearance ofSARS-CoV-2 1

JorgeHidalgoa,GloriaRodrı´guez-Vegab,andJavierPerez-Ferna ´ ndezc

aGeneralICUandCOVID-19Unit,BelizeHealthcarePartner,BelizeCity,Belize, bDepartmentof CriticalCareMedicine,HIMASanPablo,Caguas,PuertoRico, cIntensiveCareSolutions,Critical CareServices,BaptistHospital,Miami,FL,UnitedStates

Introduction

Numerousviralinfectionshaveriseninthelastdecades,causingseverediseases associatedwithlethality.Diseaseshavevariedinepidemiologyandmorbidity althoughpeoplewithriskfactorssuchasage,cardiovasculardiseases,diabetes, andotherchronicdiseaseshavemostcommonlysufferedmoreseriousconsequences.Theworldpopulationisagingandsoistheprevalenceofnoncommunicablediseases.Thus,thepotentialgroupofpeople,whoarethemostatriskof sufferingmajorconsequencesifinfectedbyavirus,isvast.Onesuchexampleis thenovelcoronavirus(nCoV),identifiedinWuhan,China,whichwasisolatedon January7,2020,causingseverepneumonia.1

Thischapteranalyzestheemergence,firstoutbreaksoutsideChina,andtheepidemiologydataandmodelsthathasguidedpublichealthpolicies.TheperiodcoveredinthischapterhadincludedthefirstnotificationofcasesbyChinauntilthe declarationofapandemicbytheWorldHealthOrganization(WHO)onFebruary 11,2020.Thischapteralsodescribessomeofthesimilaritiesbetweenthisvirus andpreviouscoronaviruses(CoVs)likesevereacuterespiratorysyndrome (SARS)-CoV(2002)andmiddleeastrespiratorysyndrome(MERS)-CoV(2012).

Theancestors:Coronavirusandhumans

CoVs,alargefamilyofsingle-strandedRNAviruses,havebeencirculatingonEarth forcenturies.WhileCoVsarewidelydetectedinbats,othermammals,birds,and reptiles,CoVsareseldomseeninhumanscausingmainlymildrespiratoryinfections. Itwasnotuntilthefirstdecadeofthetwenty-firstcenturywiththeappearanceofthe SARSoutbreakthattheirclinicalimportancewasrecognized.

CoronaviruseshavethelargestknownRNAgenome,withasizeof27–32kb.The spikeglycoprotein(S)protrudesfromthesurfaceoftheviralparticle(hencethe

COVID-19Pandemic. https://doi.org/10.1016/B978-0-323-82860-4.00004-5 Copyright # 2022ElsevierInc.Allrightsreserved.

name“coronavirus”)andisresponsibleforreceptorbindingandmembranefusion. Therefore,itisbelievedtorepresentakeydeterminantofhostrangerestriction.2

TherearefourmainsubgroupsofCoVs,namelyalpha,beta,gamma,anddelta. HumanCoVswerefirstidentifiedinthemid-1960s.CommonhumanCoVsare endemicgloballyandcausingmildrespiratorydiseaseare229E(alphaCoV), NL63(alphaCoV),OC43(betaCoV),andHKU1(betaCoV.Theytendtobetransmittedpredominantlyduringthewinterseasonintemperateclimatecountries;they arewelladaptedtohumans,andnonehavebeenfoundtobemaintainedinananimal reservoir.3,4

Onthecontrary,SARS-CoVandMERS-CoVaremostlybasedonzoonotic reservoirs,withoccasionalspilloverin tothesusceptiblehumanpopulation,possiblyviaanintermediatehostspecies.Thus,inthefirstyearsofthiscentury, SARS-CoVdemonstratedthatanimalCoVshavethepotentialtocrossoverspeciestohumans.Inthelate2003,angiotensin-convertingenzyme2wasidentified asthereceptorofSARS-CoVonthesurfac eofhumancells,allowingthespillover intohumans.5

TheindexcasesofmanyoftheseSARS-CoVearlycaseclusters(fromNovember 2002toJanuary2003)werefoodhandlersworkinginrestaurantswhereavarietyof exoticanimalswereslaughteredonthepremises.6 InFebruary2003,theChinese MinistryofHealthannouncedthestrangeoutbreakofanatypicalpneumoniain theGuangdongProvinceofsouthernChina.Newsofthis“mysterious”disease spreadfast,asdidthedisease.Duringsubsequentweeks,theoutbreakbecame self-sustaining,withclustersoftransmissioninhospitalsspillingbackintothecommunity.TheidentificationoftheSARS-CoVdidnothappenuntilalmostthree monthslater(April2003).7

SARSspreadsrapidlyalongroutesofairtravel,affecting25countriesandterritoriesacrossfivecontinents,withanestimated8096casesandatleast774deaths (casefatalityrate 10%).TheoutbreakcontinueduntilJuly2003,whentheWHO declared“allknownchainsofhuman-to-humantransmissionoftheSARSvirusnow appeartobebroken.”8 SARSwaslesstransmittableinthefirstdaysofillness,leadingpatientstobemoreinfectiousastheybecamemoresymptomatic,providingan opportunityforcasedetectionandisolationtointerrupttransmission.However,the highertransmissionbyseverepatientshascontributedtotransmissioninhospitals, especiallywhentheyunderwentaerosol-generatingprocedures.TheSARS-CoVwas alsounusuallylastingonsurfaces,moresothanotherCoVsorotherrespiratory viruses,makinginfectioncontrolinhospitalsachallenge.9 Asawarenessgrew, patientsbegantobeidentifiedandhospitalizedearlierintheillness,andaseffective infectioncontrol,modalitieswerebetterimplemented,itbecamepossibletointerrupttransmissioninthecommunityandhospitals.10

Thezoonoticsourceoftheviruswasidentifiedaftertheoutbreakended;the investigationsledtothedetectionofthevirusinarangeofmammalianspeciesavailableinthewetmarkets.Peopleworkinginthesemarketshadahighprevalenceof antibodiestoSARS-CoV,evenwithoutahistoryofhavingSARS.SARS-CoV crossedthespeciesbarrierintomaskedpalmcivetsandotheranimalsinlive-animal

marketsinChina;geneticanalysissuggestedthatthisoccurredinthelate2002.SeveralpeopleincloseproximitytopalmcivetsbecameinfectedwithSARS-CoV.11

TheemergenceofSARSin2003demonstratedtheinterconnectionoftheworld andhowrapidlyanewdiseasecanspread,duetotheexponentialincreaseininternationaltravelandtrade.Thatimpulsedtheneedtoreviewinternationalmechanisms formonitoringandcontrolofemergingdiseases;notonlyforthefourseriousinfectiousdiseasesincludedintheoriginalInternationalHealthRegulations(IHR)from 1969.12 In2005,theWorldHealthAssembly,representing196countries,agreedto implementtherevisedIHRasacommitmenttobuildtheircapacitiestodetect, assess,andreportpublichealtheventsunderabroaderrangeofpublichealthemergencyofinternationalconcern(PHEIC).TheWHOplaysthecoordinatingrolein IHRand,togetherwithtechnicalpartners,helpscountriestobuildtheircapacities todetectandcontainpublichealthhazards.

AlmostadecadelateroftheSARS-CoV,anewCoVemergedinSaudiArabiain 2012,subsequentlynamedMERS-CoV.MERS-CoVisabeta-coronavirus,likethe SARS-CoV.Itcausesseverepneumoniaaswellasrenalfailure.Indexcaseshave originatedintheArabPeninsula(Jordan,Qatar,SaudiArabia,andtheUnitedArab Emirates),whiletravel-associatedcaseshavebeendiagnosedintheEuropeanUnion, NorthAfrica,Asia,andtheUSA.ThereceptorforMERS-CoVhasbeenidentifiedto bedipeptidylpeptidaseIV,whichisexpressedinthehumanrespiratorytractandis conservedacrossmanyspecies,includingbats.12 Thisvirus,originatedfrombats, usescamelsanddromedariesasintermediaryhosts;and,althoughtheoutbreak declinedoverthetime,theriskofnewcasesisstillconsideredtoexistastheanimal reservoirpersists.13 BytheendofDecember2019,27countriesreportedatotalof 2502laboratory-confirmedcasesofMERS,including861associateddeaths (case–fatalityrate:34.4%);themajorityofthesecaseswerereportedfromSaudi Arabia(2106cases,including783relateddeaths,case–fatalityrate:37.2%). Reportedcasesareclassifiedasprimary(directspilloverfromcamels)orsecondary (human-to-humantransmission,mostlyhealthcareworkers);theproportionbetween thosecategorieschangedoverthetime,intheperiodJuly–December2019,33% wereprimarycases,6%weresecondarycases,and31%ofunknowncontacthistory. AsinSARS-CoV,human-to-humantransmissionofMERS-CoVoccursmainly associatedwithhealthcare.14 Thepredominanceofnosocomialtransmissionisprobablyduetothefactthathighervirusshedding(highviralloadsinrespiratorytracts) occursaftertheonsetofsymptomswhenmostpatientsarealreadyseekingmedical care. 15 Asanexample,intheperiod2013–2019,approximately20%ofthecasesof MERSwerehealthcareworkersinSaudiArabia.16

AffectedcountriesreducedtheglobalthreatofMERSbyaddressingknowledge gapsabouttransmission,enhancingsurveillance,andstrengtheningtheabilityto detectcasesearlyandcontainoutbreaksthroughimprovedinfectionprevention andcontrolmeasuresinhospitals.Preventinginternationalspreadandsustained transmissionhasbeenimprovedbylocalpolicies,betterpreventionandcontrolmeasuresinhospitals,restrictionofcamelmovementinaffectedareas,strongerandmore comprehensiveinvestigationsofcasesandclusters,andimprovedcommunication.17

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