Imported Dengue Fever in Milan, Italy: A Seven-Year Retrospective Study

Background: Dengue fever is an arboviral infection transmitted by Aedes mosquitoes that has recently become a public health concern also in Europe, causing many outbreaks of autochthonous cases. Methods: We retrospectively retrieved dengue cases in returning travelers from tropical areas diagnosed a...

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Veröffentlicht in:Infectious disease reports Jg. 17; H. 5; S. 113
Hauptverfasser: Pieruzzi, Margherita Eleonora, Mileto, Davide, Behring, Alessandra Helen, Caronni, Stefania, Mancon, Alessandro, Vezzosi, Luigi, Rizzo, Alberto, Poloni, Andrea, Gori, Andrea, Giacomelli, Andrea, Antinori, Spinello
Format: Journal Article
Sprache:Englisch
Veröffentlicht: Switzerland MDPI AG 12.09.2025
Schlagworte:
Antibodies
Blood
Chikungunya virus
Cross-reactivity
Dengue fever
Dengue hemorrhagic fever
Emergency medical care
Epidemics
Hospitals
Immunization
Immunoglobulin G
Immunoglobulin M
imported
Italy
Laboratories
Leukopenia
Mosquitoes
Myalgia
Pandemics
Patients
Plasma
Polymerase chain reaction
Public health
Real time
Serology
Serotypes
Thrombocytopenia
travelers
Urine
Vector-borne diseases
Viral diseases
warning signs
West Nile virus
Zika virus
Italy
Southeast Asia
Spain
warning signs
Italy
dengue fever
travelers
imported
ISSN:2036-7449, 2036-7430, 2036-7449
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Abstract Background: Dengue fever is an arboviral infection transmitted by Aedes mosquitoes that has recently become a public health concern also in Europe, causing many outbreaks of autochthonous cases. Methods: We retrospectively retrieved dengue cases in returning travelers from tropical areas diagnosed at the Luigi Sacco Hospital between January 2018 and December 2024. All patients with positive serology for DENV (IgM alone or IgM and IgG or neutralizing antibodies detection) and/or positive real-time polymerase chain reaction (RT-PCR) for DENV RNA on plasma and urine were considered. Analyses were descriptive. Results: This analysis included 159 travelers with confirmed (n = 138; 86.8%) or probable (n = 21; 13.2%) dengue fever. The median age was 38 years (interquartile range [IQR] 30–50); 87 (54.7%) were females. The median time between symptom onset and seeking medical attention was four days (IQR 3–6); 29.6% required hospitalization, with a median stay of four days (IQR 0–5). The most common symptoms included fever (100%), myalgia (52.2%), and headache (49.1%). Laboratory findings revealed thrombocytopenia (53.8%), leukopenia (64.1%), elevated ALT (51.9%), and LDH (60.2%). Among the confirmed cases, 128 (92.8%) were diagnosed with RT-PCR. Serotypes 1 and 2 were the most prevalent (28.9% and 27.3%, respectively). Most cases were classified as dengue without warning signs (150, 94.3%), eight cases (5.0%) as dengue with warning signs, and one as severe dengue. Conclusions: Dengue fever is an important cause of fever among travelers returning to Italy from endemic areas. Although severe dengue is rare among travelers, further prospective studies need to address this issue. Diagnosis should be pursued by using molecular tools because of cross-reactivity with other arboviruses.
AbstractList Dengue fever is an arboviral infection transmitted by mosquitoes that has recently become a public health concern also in Europe, causing many outbreaks of autochthonous cases. We retrospectively retrieved dengue cases in returning travelers from tropical areas diagnosed at the Luigi Sacco Hospital between January 2018 and December 2024. All patients with positive serology for DENV (IgM alone or IgM and IgG or neutralizing antibodies detection) and/or positive real-time polymerase chain reaction (RT-PCR) for DENV RNA on plasma and urine were considered. Analyses were descriptive. This analysis included 159 travelers with confirmed ( = 138; 86.8%) or probable ( = 21; 13.2%) dengue fever. The median age was 38 years (interquartile range [IQR] 30-50); 87 (54.7%) were females. The median time between symptom onset and seeking medical attention was four days (IQR 3-6); 29.6% required hospitalization, with a median stay of four days (IQR 0-5). The most common symptoms included fever (100%), myalgia (52.2%), and headache (49.1%). Laboratory findings revealed thrombocytopenia (53.8%), leukopenia (64.1%), elevated ALT (51.9%), and LDH (60.2%). Among the confirmed cases, 128 (92.8%) were diagnosed with RT-PCR. Serotypes 1 and 2 were the most prevalent (28.9% and 27.3%, respectively). Most cases were classified as dengue without warning signs (150, 94.3%), eight cases (5.0%) as dengue with warning signs, and one as severe dengue. Dengue fever is an important cause of fever among travelers returning to Italy from endemic areas. Although severe dengue is rare among travelers, further prospective studies need to address this issue. Diagnosis should be pursued by using molecular tools because of cross-reactivity with other arboviruses.
Background: Dengue fever is an arboviral infection transmitted by Aedes mosquitoes that has recently become a public health concern also in Europe, causing many outbreaks of autochthonous cases. Methods: We retrospectively retrieved dengue cases in returning travelers from tropical areas diagnosed at the Luigi Sacco Hospital between January 2018 and December 2024. All patients with positive serology for DENV (IgM alone or IgM and IgG or neutralizing antibodies detection) and/or positive real-time polymerase chain reaction (RT-PCR) for DENV RNA on plasma and urine were considered. Analyses were descriptive. Results: This analysis included 159 travelers with confirmed (n = 138; 86.8%) or probable (n = 21; 13.2%) dengue fever. The median age was 38 years (interquartile range [IQR] 30–50); 87 (54.7%) were females. The median time between symptom onset and seeking medical attention was four days (IQR 3–6); 29.6% required hospitalization, with a median stay of four days (IQR 0–5). The most common symptoms included fever (100%), myalgia (52.2%), and headache (49.1%). Laboratory findings revealed thrombocytopenia (53.8%), leukopenia (64.1%), elevated ALT (51.9%), and LDH (60.2%). Among the confirmed cases, 128 (92.8%) were diagnosed with RT-PCR. Serotypes 1 and 2 were the most prevalent (28.9% and 27.3%, respectively). Most cases were classified as dengue without warning signs (150, 94.3%), eight cases (5.0%) as dengue with warning signs, and one as severe dengue. Conclusions: Dengue fever is an important cause of fever among travelers returning to Italy from endemic areas. Although severe dengue is rare among travelers, further prospective studies need to address this issue. Diagnosis should be pursued by using molecular tools because of cross-reactivity with other arboviruses.
Dengue fever is an arboviral infection transmitted by Aedes mosquitoes that has recently become a public health concern also in Europe, causing many outbreaks of autochthonous cases.BACKGROUNDDengue fever is an arboviral infection transmitted by Aedes mosquitoes that has recently become a public health concern also in Europe, causing many outbreaks of autochthonous cases.We retrospectively retrieved dengue cases in returning travelers from tropical areas diagnosed at the Luigi Sacco Hospital between January 2018 and December 2024. All patients with positive serology for DENV (IgM alone or IgM and IgG or neutralizing antibodies detection) and/or positive real-time polymerase chain reaction (RT-PCR) for DENV RNA on plasma and urine were considered. Analyses were descriptive.METHODSWe retrospectively retrieved dengue cases in returning travelers from tropical areas diagnosed at the Luigi Sacco Hospital between January 2018 and December 2024. All patients with positive serology for DENV (IgM alone or IgM and IgG or neutralizing antibodies detection) and/or positive real-time polymerase chain reaction (RT-PCR) for DENV RNA on plasma and urine were considered. Analyses were descriptive.This analysis included 159 travelers with confirmed (n = 138; 86.8%) or probable (n = 21; 13.2%) dengue fever. The median age was 38 years (interquartile range [IQR] 30-50); 87 (54.7%) were females. The median time between symptom onset and seeking medical attention was four days (IQR 3-6); 29.6% required hospitalization, with a median stay of four days (IQR 0-5). The most common symptoms included fever (100%), myalgia (52.2%), and headache (49.1%). Laboratory findings revealed thrombocytopenia (53.8%), leukopenia (64.1%), elevated ALT (51.9%), and LDH (60.2%). Among the confirmed cases, 128 (92.8%) were diagnosed with RT-PCR. Serotypes 1 and 2 were the most prevalent (28.9% and 27.3%, respectively). Most cases were classified as dengue without warning signs (150, 94.3%), eight cases (5.0%) as dengue with warning signs, and one as severe dengue.RESULTSThis analysis included 159 travelers with confirmed (n = 138; 86.8%) or probable (n = 21; 13.2%) dengue fever. The median age was 38 years (interquartile range [IQR] 30-50); 87 (54.7%) were females. The median time between symptom onset and seeking medical attention was four days (IQR 3-6); 29.6% required hospitalization, with a median stay of four days (IQR 0-5). The most common symptoms included fever (100%), myalgia (52.2%), and headache (49.1%). Laboratory findings revealed thrombocytopenia (53.8%), leukopenia (64.1%), elevated ALT (51.9%), and LDH (60.2%). Among the confirmed cases, 128 (92.8%) were diagnosed with RT-PCR. Serotypes 1 and 2 were the most prevalent (28.9% and 27.3%, respectively). Most cases were classified as dengue without warning signs (150, 94.3%), eight cases (5.0%) as dengue with warning signs, and one as severe dengue.Dengue fever is an important cause of fever among travelers returning to Italy from endemic areas. Although severe dengue is rare among travelers, further prospective studies need to address this issue. Diagnosis should be pursued by using molecular tools because of cross-reactivity with other arboviruses.CONCLUSIONSDengue fever is an important cause of fever among travelers returning to Italy from endemic areas. Although severe dengue is rare among travelers, further prospective studies need to address this issue. Diagnosis should be pursued by using molecular tools because of cross-reactivity with other arboviruses.
Author Mileto, Davide
Pieruzzi, Margherita Eleonora
Vezzosi, Luigi
Poloni, Andrea
Caronni, Stefania
Giacomelli, Andrea
Rizzo, Alberto
Behring, Alessandra Helen
Mancon, Alessandro
Gori, Andrea
Antinori, Spinello
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BackLink https://www.ncbi.nlm.nih.gov/pubmed/40981333$$D View this record in MEDLINE/PubMed
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Snippet Background: Dengue fever is an arboviral infection transmitted by Aedes mosquitoes that has recently become a public health concern also in Europe, causing...
Dengue fever is an arboviral infection transmitted by mosquitoes that has recently become a public health concern also in Europe, causing many outbreaks of...
Dengue fever is an arboviral infection transmitted by Aedes mosquitoes that has recently become a public health concern also in Europe, causing many outbreaks...
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SubjectTerms Antibodies
Blood
Chikungunya virus
Cross-reactivity
Dengue fever
Dengue hemorrhagic fever
Emergency medical care
Epidemics
Hospitals
Immunization
Immunoglobulin G
Immunoglobulin M
imported
Italy
Laboratories
Leukopenia
Mosquitoes
Myalgia
Pandemics
Patients
Plasma
Polymerase chain reaction
Public health
Real time
Serology
Serotypes
Thrombocytopenia
travelers
Urine
Vector-borne diseases
Viral diseases
warning signs
West Nile virus
Zika virus
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Title Imported Dengue Fever in Milan, Italy: A Seven-Year Retrospective Study
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