What Is Zika Virus Infection?
Zika virus infection is a vector-borne disease spread by the bite of an infected mosquito called Aedes. Zika virus is a single-stranded RNA virus of the genus Flavivirus and family Flaviviridae, a family that includes dengue virus, yellow virus, West Nile Virus and chikungunya virus. [1]
Zika virus has two major lineages at different locations: African and Asian. In many people, the infection causes mild symptoms and is self-limiting, while in some, it can cause severe symptoms like brain and nervous system complications. Newborns may face certain birth defects if the infection is transmitted to them through infected mothers.
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How Is Zika Virus Infection Transmitted?
The transmission of the Zika virus to humans takes place when infected Aedes mosquitoes (like Aedes aegypti and Aedes albopictus) bite humans and transfer the virus to their bodies. These mosquitoes are females and typically lay eggs on stagnant water sources like buckets, flower pots or animal dishes. They need human blood for the development of their eggs. [2]
When Aedes mosquitoes bite an infected person (mostly during the daytime), the virus gets in their bodies, which then gets transmitted to another person whom they bite the next time. The mosquitoes are infected only when the host has the infection in their bodies, probably during the first week of infection.
Some of the other ways by which the Zika virus infection is transmitted include:
Symptoms Of Zika Virus Infection
The symptoms of Zika virus infection occur only in around 20 per cent of infected individuals and the majority of them remain asymptomatic. Also, the symptoms are quite similar to dengue and chikungunya virus infection.
Some of the common symptoms of Zika virus infection include: [1]
Zika Virus In India
According to a study, earlier on 15 May 2017, the first three laboratory-confirmed cases of Zika virus infection in India have been reported in India by the Ministry of Health and Family Welfare from the Bapunagar area (Ahmedabad), followed by a case in Chennai.
The report also adds that this may not be the first case in India, as in 1954, NIV has detected Zika virus antibodies in a few samples from Bharuch district. However, due to its similarity with dengue and other flaviviruses, it was difficult to confirm the test of Zika in India based on serology (identification of antibodies in the blood). [8]
Also, the patients from Gujarat and Chennai have no travel history to Zika endemic locations, suggesting that the infection might be present from before in the country, in a silent and low-key ecological niche.
Later, in India, around 35000 samples were tested of people with febrile illness, out of which only four cases have been yielded, while out of the testing of 18000 mosquitoes, the virus was detected in none.
This shows that though Zika infection agent is present in India, its count is very low compared to other affected countries like Brazil.
To Note: The case of a pregnant woman who has recently been diagnosed in India with Zika has gained attention because the infection is considered to have made a comeback after four years, that too amidst the COVID-19 pandemic.
Complication Of Zika Virus Infection
Some of the known complications of Zika virus infection include:
Diagnosis Of Zika Virus Infection
Zika virus infection is often confused with dengue or chikungunya infection. In areas where Zika is prevalent, the diagnosis is easier. The first step for diagnosis is answering questions related to your travel history to Zika endemic areas, having sex with an infected person, or any recent events of blood transfusion or organ transplantation.
Some of the diagnostic methods include: