classification & case definitions of dengue infections
TRANSCRIPT
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CLINICAL FEATURES AND DIAGNOSIS IN PATIENTS WITH
DENGUE INFECTION
Dr. ALI JAWA MD (USA), MPH (USA), FACE (USA)
Diplomate American Board of Endocrinology & Diabetes
Diplomate American Board of Internal Medicine
Diplomate American Board of Physician Nutrition Specialists
Assistant Professor of Endocrinology/Diabetes
Allama Iqbal Medical College, Lahore
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DENV 1
DENV 2
DENV 3
DENV 4
DENGUE VIRUS SEROTYPES
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DENV 1
DENV 2
DENV 3
DENV 4
Dengue virus
Life long immunity
Short term cross-protection
Short term cross-protection
Short term cross-protection
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Yip WCL. Dengue Haemorrhagic Fever: Current Approaches to Management. Medical Progress October 1980.
Clinical Course of Dengue Infection
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Dengue Virus
Infection
Asymptomatic Symptomatic
Undifferentiated Fever
Dengue Fever
Syndrome
Without Hemorrhage
With Unusual Hemorrhage
Dengue Hemorrhagic
Fever
No ShockDengue Shock
Syndrome
Expanded Dengue Syndrome/ Isolated
organopathy/ Unusual manifestation
Dengue Virus Infections WHO 2011 Classification System
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Probable
Confirmed
Reportable
Case Definition for Dengue Fever
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Suspected
Probable
Confirmed
DEAG Case Definition
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Suspected
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Probable
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Confirmed
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Out-patient department Emergency department
Febrile patient(2-10 days)
Suspected Case
Probable case
Day 2-5NS-1 antigen
Day 6-10IgM
CBC
Admit
Confirmed case
REPORT
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Less than 5 days More than 5 days
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An acute febrile illness with two or more of the following manifestations:
Headache
Retro-orbital pain
Myalgia
Arthralgia
Rash
Hemorrhagic manifestations
Leukopenia
Thrombocytopenia (less than 150,000)
Rising Hct (5-10%)
And
• Supportive Serology ( a reciprocal Hemagglutination-inhibition antibody titer≥1280, a comparable IgG ELISA titer or a positive IgM antibody test on a late acute
or convalescent-phase serum specimen)
Or
• Occurrence at same location and time as other confirmed cases of dengue
PROBABLE DENGUE FEVER (2011)
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DENGUE FEVER/DHFDifferential Diagnosis
Arboviruses
Other viral
Diseases
Bacterial diseases
Parasitic diseases
Chikungunya
Measles; rubella and other viral
exanthems; Epstein-Barr Virus,
Enteroviruses, Influenza; hepatitis A,
Hantavirus
Meningococcemia, leptospirosis,
typhoid, melioidosis, rickettsial diseases, Scarlet fever
Malaria
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A case confirmed by laboratory criteria
CONFIRMED DENGUE FEVER
Isolation of Dengue Virus from serum or Autopsy Sample
≥4 fold rise in IgG or IgM antibody titres in paired serum samples
Demonstration of Dengue Antigen in autopsy specimen, serum or CSF
Detection of Dengue Virus Genomic Sequence by PCR
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Any probable or confirmed case of dengue
should be reported to Health Department
and requires admission to the hospital
REPORTABLE DENGUE FEVER
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DHF vs DF
Febrile Phase
Critical Phase
Recovery Phase
Febrile Phase
Critical Phase
Recovery Phase
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The following must ALL be present:
Fever, or h/o acute fever, lasting 2-7 days, occasionally biphasic
Hemorrhagic tendencies, evidenced by at least one of the following
•A positive tourniquet test
•Petechiae, ecchymoses or purpura
•Bleeding from mucosa, gastrointestinal tract, injection sites, or other locations
•Haemetemesis or malena
Thrombocytopenia (≤100,000 per mm3)
Evidence of Plasma Leakage manifested by at least one of the following
•A rise in Hct ≥20% above average for age, sex and population
•A drop in Hct ≥20% after volume-replacement treatment
•Signs of plasma leakage such as pleural effusion, ascites and hypoproteinemia
CASE DEFINITION FOR DENGUE HEMORRHAGIC FEVER
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All of the four criteria of DHF
plus
evidence of circulatory failure manifested by:
• Rapid and weak pulse, and
• Narrow Pulse Pressure (≤ 20 mmHg)Or manifested by
• Hypotension for age, and
• Cold, clammy skin and restlessness
CASE DEFINITION FOR DENGUE SHOCK SYNDROME
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Liver failure
central nervous system (CNS) dysfunction
myocardial dysfunction
encephalopathy and seizures
acute pure motor weakness
Mononeuropathies
Polyneuropathies
Guillain-Barré syndrome
transverse myelitis
myocarditis
EXPANDED DENGUE SYNDROME
Organopathy in the setting
of acute dengue virus infection
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Tourniquet test
Pulse (Bradycardia, Tachycardia in an afebrile
patient)
Blood Pressure
Pulse Pressure
Temperature
Capillary refill time
EXAMINATION
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INJECTED PHARYNX
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PETECHIAL RASH
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SUBMUCOSAL HEMORRHAGE
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BRUISING
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CAPILLARY REFILL TIME
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TOURNIQUET TEST
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TOURNIQUET TEST
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Positive TT serves as the only indicator of hemorrhagic tendency in grade 1 DHF.
The sensitivity of the test varies widely from as low as 0% to 57%, depending on the phase of illness the test was done and how often the test was repeated, if negative.
In addition 5-21% of patients with dengue like illness had positive tourniquet test but subsequently have negative dengue serology
TOURNIQUET TEST
Level of Evidence Reference
Level 1 Badyopadhyay S, Lum LCS, Kroeger A. Classifying dengue: areview of the difficulties in using the WHO case classificationfor dengue haemorrhagic fever. Tropical Medicine andInternational Health. 2006; 11(8):1238-55.
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A recent study demonstrated that there was 95.3% positive predictive value if fever, positive tourniquet test, leucopenia/ thrombocytopenia/ hemoconcentration were used as screening criteria.
Presence of ≥10 petechiae per square inch should be
considered positive.
TOURNIQUET TEST
Level of Evidence
Reference
Level 8 Kittigul L, Pitakarnjanakul P, Sujirarat D, et al . The differences of clinical manifestations and laboratory findings in children and adults with dengue virus infection. J Clin Virol. 2007 Jun;39(2):76-81.
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Dengue Fever and DHF could be indistinguishable at
the time of presentation
All probable am d confirmed dengue fever cases need
to be admitted and reported to health department
Careful attention physical signs and symptoms as well
as appropriate and timely laboratory tests are key to
diagnosis
TAKE HOME MESSAGE
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Thank You