Zika virus: Difference between revisions

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==Background==
βˆ’
= Definition =
  
   
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*Single-stranded, positive-sense RNA virus in the [[Flaviviridae]] family, genus [[Flavivirus]]
βˆ’
* Infection with the Zika virus
  
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*Discovered in 1947 in Zika Forest, Uganda
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*Vector-borne infection carried primarily by [[Vector::Aedes aegypti]] mosquitoes, but possibly also [[Vector::Aedes albopictus]] mosquitoes
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*Sexual transmission appears to be possible
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*Now essentially endemic in tropics worldwide
   
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==Clinical Manifestations==
βˆ’
= Presentation =
  
   
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*75% are asymptomatic
βˆ’
* History
  
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*Incubation period of [[Usual incubation period::3 to 14 days]]
βˆ’
** Fevers
  
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*[[Causes::Fever]], [[Causes::rash]], [[Causes::arthralgias]], [[Causes::conjunctivitis]], and [[Causes::headache]]
βˆ’
** Rash
  
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*May also see [[Causes::thrombocytopenia]], and can be severe enough to cause abnormal bleeding or hematomas
βˆ’
** Arthralgias
  
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*Usually self-limited, lasting around 5 days
βˆ’
* Signs & Symptoms
  
   
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=== Postinfectious Complications ===
βˆ’
= Investigations =
  
   
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*Can have neurological disease in some cases, primarily presenting as [[Causes::Guillain-BarrΓ© syndrome]]
βˆ’
* Labs
  
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*Rarely, [[acute myelitis]], [[meningoencephalitis]], [[acute disseminated encephalomyelitis]], [[reverse sensory polyneuropathy]]
βˆ’
** Serum rRT-PCR
  
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=== Congenital Infection ===
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*With maternal infection, causes a [[Congenital Zika|congenital syndrome]] of CNS abnormalities including [[microcephaly]], [[CNS calcifications in neonates|intracranial calcifications]], [[lissencephaly]], [[pachygyria]], and vision and hearing loss
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==Differential Diagnosis==
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*[[Dengue|Dengue virus]]
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*[[Chikungunya virus]]
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{| class="wikitable"
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!Feature
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![[Dengue]]
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!Zika
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![[Chikungunya]]
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|-
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|Asymptomatic
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|40-80%
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|35-85%
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|3-28%
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|-
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|Fever
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| +++
  +
| ++
  +
| +++
  +
|-
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|Rash
  +
| +
  +
| +++
  +
| ++
  +
|-
  +
|Conjunctivitis
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|–
  +
| ++
  +
| +
  +
|-
  +
|Arthralgia
  +
| +
  +
| ++
  +
| +++
  +
|-
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|Myalgia
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| ++
  +
| +
  +
| +
  +
|-
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|Headache
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| ++
  +
| +
  +
| ++
  +
|-
  +
|Hemorrhage
  +
| ++
  +
|–
  +
|–
  +
|-
  +
|Shock
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| +
  +
|–
  +
|–
  +
|-
  +
|Thrombocytopenia
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| +++
  +
| +
  +
|–
  +
|-
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|Leukopenia
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| ++
  +
|–
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| ++
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|}
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==Investigations==
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*Serum rRT-PCR, ideally done within 10 days of symptoms onset
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*Serology can be tested after 10 days of symptoms, but is non-specific
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==Management==
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*Supportive
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*For risk of congenital disease
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**If asymptomatic, no need to delay attempts at conception
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**If symptomatic and diagnosis is confirmed, counsel to delay attempts at conception for 2 months (women) or 3 months (men) after return from the endemic area
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**If symptomatic and diagnosis is not confirmed, then discuss with the patient
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**If the woman is pregnant and man has compatible symptoms, should abstain from unprotected sex for the duration of pregnancy
   
 
[[Category:Flaviviridae]]
  
[[Category:Flaviviridae]]

Latest revision as of 09:50, 20 September 2020

Background

  • Single-stranded, positive-sense RNA virus in the Flaviviridae family, genus Flavivirus
  • Discovered in 1947 in Zika Forest, Uganda
  • Vector-borne infection carried primarily by Aedes aegypti mosquitoes, but possibly also Aedes albopictus mosquitoes
  • Sexual transmission appears to be possible
  • Now essentially endemic in tropics worldwide

Clinical Manifestations

Postinfectious Complications

Congenital Infection

Differential Diagnosis

Feature Dengue Zika Chikungunya
Asymptomatic 40-80% 35-85% 3-28%
Fever +++ ++ +++
Rash + +++ ++
Conjunctivitis – ++ +
Arthralgia + ++ +++
Myalgia ++ + +
Headache ++ + ++
Hemorrhage ++ – –
Shock + – –
Thrombocytopenia +++ + –
Leukopenia ++ – ++

Investigations

  • Serum rRT-PCR, ideally done within 10 days of symptoms onset
  • Serology can be tested after 10 days of symptoms, but is non-specific

Management

  • Supportive
  • For risk of congenital disease
    • If asymptomatic, no need to delay attempts at conception
    • If symptomatic and diagnosis is confirmed, counsel to delay attempts at conception for 2 months (women) or 3 months (men) after return from the endemic area
    • If symptomatic and diagnosis is not confirmed, then discuss with the patient
    • If the woman is pregnant and man has compatible symptoms, should abstain from unprotected sex for the duration of pregnancy
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