COVID-19:Advice,updatesandvaccineoptionsWeareopenforsafein-personcare.Learnmore:MayoClinicfactsaboutcoronavirusdisease2019(COVID-19)OurCOVID-19patientandvisitorguidelines,plustrustedhealthinformationLateston COVID-19vaccination bysite:ArizonapatientvaccinationupdatesArizona,FloridapatientvaccinationupdatesFlorida,RochesterpatientvaccinationupdatesRochesterandMayoClinicHealthSystempatientvaccinationupdatesMCHSSkiptositenavigationSkiptoContentThiscontentdoesnothaveanEnglishversion.ThiscontentdoesnothaveanArabicversion.SectionsforYellowfeverSymptoms&causesDiagnosis&treatmentPrintOverviewYellowfeverisaviralinfectionspreadbyaparticulartypeofmosquito.TheinfectionismostcommoninareasofAfricaandSouthAmerica,affectingtravelerstoandresidentsofthoseareas.Inmildcases,yellowfevercausesafever,headache,nauseaandvomiting.Butyellowfevercanbecomemoreserious,causingheart,liverandkidneyproblemsalongwithbleeding.Upto50%ofpeoplewiththemore-severeformofyellowfeverdieofthedisease.There'snospecifictreatmentforyellowfever.Butgettingayellowfevervaccinebeforetravelingtoanareainwhichthevirusisknowntoexistcanprotectyoufromthedisease.Products&ServicesBook:MayoClinicFamilyHealthBook,5thEditionNewsletter:MayoClinicHealthLetter—DigitalEditionShowmoreproductsfromMayoClinicSymptomsDuringthefirstthreetosixdaysafteryou'vedevelopedyellowfever—theincubationperiod—youwon'texperienceanysignsorsymptoms.Afterthis,theinfectionentersanacutephaseandthen,insomecases,atoxicphasethatcanbelife-threatening.AcutephaseOncetheinfectionenterstheacutephase,youmayexperiencesignsandsymptomsincluding:FeverHeadacheMuscleaches,particularlyinyourbackandkneesSensitivitytolightNausea,vomitingorbothLossofappetiteDizzinessRedeyes,faceortongueThesesignsandsymptomsusuallyimproveandaregonewithinseveraldays.ToxicphaseAlthoughsignsandsymptomsmaydisappearforadayortwofollowingtheacutephase,somepeoplewithacuteyellowfeverthenenteratoxicphase.Duringthetoxicphase,acutesignsandsymptomsreturnandmore-severeandlife-threateningonesalsoappear.Thesec