Nisha Dahiya1
Neelam Sehrawat- 1Department of Genetics, Maharshi Dayanand University, Rohtak, Haryana, India
- 2Department of Biotechnology, Indira Gandhi University, Rewari, Haryana, India
The Zika virus (ZIKV) is a vector-borne flavivirus that has been detected in 87 countries worldwide. Outbreaks of ZIKV infection have been reported from various places around the world and the disease has been declared a public health emergency of international concern. ZIKV has two modes of transmission: vector and non-vector. The ability of ZIKV to vertically transmit in its competent vectors, such as Aedes aegypti and Aedes albopictus, helps it to cope with adverse conditions, and this could be the reason for the major outbreaks that occur from time to time. ZIKV outbreaks are a global threat and, therefore, there is a need for safe and effective drugs and vaccines to fight the virus. In more than 80% of cases, ZIKV infection is asymptomatic and leads to complications, such as microcephaly in newborns and Guillain–Barré syndrome (GBS) in adults. Drugs such as sofosbuvir, chloroquine, and suramin have been found to be effective against ZIKV infections, but further evaluation of their safety in pregnant women is needed. Although temoporfin can be given to pregnant women, it needs to be tested further for side effects. Many vaccine types based on protein, vector, DNA, and mRNA have been formulated. Some vaccines, such as mRNA-1325 and VRC-ZKADNA090-00-VP, have reached Phase II clinical trials. Some new techniques should be used for formulating and testing the efficacy of vaccines. Although there have been no recent outbreaks of ZIKV infection, several studies have shown continuous circulation of ZIKV in mosquito vectors, and there is a risk of re-emergence of ZIKV in the near future. Therefore, vaccines and drugs for ZIKV should be tested further, and safe and effective therapeutic techniques should be licensed for use during outbreaks.
Introduction
The Zika virus (ZIKA) has affected about 87 countries worldwide since 2019, especially countries in tropical and subtropical regions (1). ZIKA is a Flavivirus, having a positive-sense, single-stranded RNA encoding for three structural proteins [i.e., precursor membrane protein (prM), capsid protein (C), and envelope protein (E)] and seven non-structural proteins (i.e., NS1, NS2A, NS2B, NS3, NS4A, NS4B, and NS5) (2). In 1950, the first case of human infection with ZIKA was reported in Africa. In 2016, the WHO declared ZIKA infection a public health emergency of international concern (3). ZIKV is found in several WHO regions (i.e., the African Region, Region of the Americas, South-East Asia Region, and the Western Pacific Region) (4). Recently, in India in 2021, a total of 150 cases of ZIKV infection were reported. Most patients were asymptomatic or had a mild fever (5). Figure 1 shows the regions at risk of ZIKV infection.
Figure 1 World map of areas at risk of ZIKV (6).
Transmission of ZIKV
The Zika virus mainly spreads through an Aedes mosquito bite, but can also spread by non-vector transmission, for example by congenital transmission, blood transfusion, organ transplantation, sexual transmission, and vertical transmission (4). The vertical transmission capacity of ZIKV has been studied in Aedes mosquitoes, and vertical transmission has been found to help ZIKV to cope with harsh conditions (7). ZIKV is an arbovirus that is transmitted by two cycles: a sylvatic cycle involving transmission between non-human primates and arboreal insects in forests, and an urban cycle between humans and urban mosquitoes (8). The ZIKV transmission cycle is shown in Figure 2.
Figure 2 Transmission modes of ZIKV (created with BioRender.com).
Vector competency for ZIKV
In Asian and African mosquitos, Ae. aegypti, Ae. albopictus, Ae. vexans, Ae. (Rampamyia) notoscriptus, Ae. (Ochlerotatus) camptorhynchus, Ae. vittatus, Ae. luteocephalus, and Culex quinquefasciatus act as potential vectors (9, 10). Anopheles gambiae, A. stephensi, and Cx pipiens have also been shown to be probable vectors (11). Ae. (Stegomyia) hensilli and Ae. (Stegomyia) polynesiensis were found to be probable vectors during the ZIKV outbreak in Yap Island and French Polynesia (12). Vectorial capacity (i.e., vector-borne transmission ability) is affected by the ecological traits and abundance of vectors, and poor vectors with limited vector competence can lead to outbreaks worldwide (10, 13). Del Carpio et al. (2018) revealed that in Mexico a variety of species of Culicidae were present. In Mexico, Ae. Aegypti and Ae. albopictus, A. species such as A. albimanus and A. pseudopunctipennis, and Culex family members, such as Cx perfuscus, Cx pipens, and Cx quinquefasciatus, act as potential vectors during outbreaks. However, some mosquito species endemic to Mexico, for example, Ae. sumidero, Ae. tehuantepec, Ae. guerrero, Ae. ramirezi, Ae. laguna, Ae. cozumelensis, Cx jalisco, Cx sandrae, Cx schicki, Cx arizonensis, and A. aztecus, could act as a vector in the absence of potential vectors. In America, the Culicidae family is highly diversified and competes with Aedes species for being a potential vector to transmit ZIKV (14). A comprehensive assessment of vector competency in Brazil concluded that Aedes species can cause a pandemic in the absence of arboviral-specific vectors, such as Ae. Aegypti, while other species like Ae. albopictus or Ae. japonicus can act as potential vectors for arboviruses (15). The distribution of probable vectors is shown in Figure 3.
Figure 3 Distribution of vector species infected with ZIKV (10).
Symptoms of ZIKV infection
The incubation period of ZIKV is approximately 3–14 days. The majority of people, ≈80%, do not show any symptoms of infection. Symptoms that are observed in 20%–25% of ZIKV patients with an acute infection include joint pain, conjunctivitis, malaise, muscle pain, headache, fever, and rash, as shown in Figure 4. These symptoms generally last for 2–7 days (1).
Figure 4 Common symptoms of an acute ZIKV infection (created with BioRender.com).
Complications of ZIKV disease
ZIKV infection during pregnancy can result in fetal loss, stillbirth, and preterm birth. In newborns, ZIKV can cause congenital abnormalities such as microcephaly (16). ZIKV infection also triggers myelitis, Guillain–Barré syndrome (GBS), and neuropathy in adults and older children (1). The complications, such as microcephaly, are shown in Figures 5, 6.
Figure 5 Different complications observed during pregnancy due to ZIKV infection (created with BioRender.com).
Figure 6 Microcephaly observed in newborns (www.cdc.gov.in).
Acute ZIKV infection is self-limiting, and patients recover, but the matter of serious concern is neonatal complications, which are associated with chronic ZIKV infection. In 2015, during a ZIKV outbreak in Brazil, the number of cases of newborns with microcephaly increased (17). Complications such as optic neuropathy, glaucoma, lissencephaly, microcephaly, and ventriculomegaly are also associated with ZIKV infection, as ZIKV mRNA was observed in the amniotic fluid of pregnant women (18). ZIKV infection in pregnant women has been shown to be harmful to fetuses. In the first and second trimesters of pregnancy, ZIKV infection can have severe effects, such as spontaneous abortion, congenital abnormalities, and fetal death, or necessitate therapeutic abortion due to congenital malformation. Congenital abnormalities such as microcephaly, hydrocephalus, hypoplasia, hypertonicity, cerebellar calcification, and seizures related to the neurological system, osteoskeletal system abnormalities, such as arthrogryposis and clubfoot, and optic system abnormalities, such as ophthalmic changes in the posterior and anterior segments, and abnormal visual functions, were observed in neonates with the help of image tests (19). An acute infection of ZIKV may lead to GBS. GBS is an autoimmune condition in which gradual muscle weakness, reduced nerve function, and paralysis are observed as myelinated neural cells are attacked by cell-mediated immunity (20, 21). In French Polynesia, during a ZIKV outbreak in 2013–14, cases of GBS increased 20-fold, and a close relationship was seen between the manifestation of ZIKV and GBS (20). In other studies, it has been reported that the prevalence of GBS with ZIKV is 42% and 24% in Brazil and America, respectively. The variations in prevalence, which have been reported, may be due to the reduced incidence as a result of the low virulence and pathogenicity of the virus. Other GBS-causing agents include a species of Campylobacter and various arboviruses related to ZIKV (22, 23).
Mechanism of ZIKV neuropathogenesis
ZIKV infection leads to neuropathogenesis through various mechanisms, neuronal apoptosis of the immune response, an inflammatory response, and cell-cycle dysregulation (24). In many studies, it has been found that, during vertical transfer from an infected mother to a developing fetus, ZIKV can successfully infect human neural progenitor cells (hNPCs) (25). During the first trimester of pregnancy, hNPCs generate brain organoids and neurospheres for fetal brain development, but either hNPCs infected with ZIKV show a cytopathic effect and die, or the cytopathic effect is reduced by virus replication, leading to brain abnormalities such as microcephaly and restriction of fetal brain development (24, 26). It has been observed previously that cells with highly expressed Axl receptor tyrosine kinase (AXL) receptors are more susceptible to ZIKV infection (27). The AXL receptor mediates the ZIKV infection to keratinocytes and fibroblasts. The various cellular receptors known to be involved in ZIKV neuropathogenesis are dendritic cell-specific intercellular adhesion molecule-3-grabbing non-integrin (DC-SIGN), phosphatidylserine receptor proteins, such as T-cell immunoglobulin mucin-1 (TIM-1), TIM-4, AXL, and tyrosine–protein kinase receptor 3 (TYRO3), and heat shock proteins (HSPs), glucose-regulating protein 78 (GRP78/BiP), and a cluster of differentiation (CD) 14-associated molecules (28–30). In addition, ZIKV interacts with toll-like receptor 3 (TLR3) and induces an interferon response. ZIKV has to overcome the innate immune barrier by degrading the signal transducer and activator of transcription 2 (STAT2) (2). It has been found that silencing of the AXL gene up-regulates type I interferon signaling, indicating that AXL helps in increasing ZIKV infection by down-regulating type I interferon signaling (31). Recent studies have revealed that ZIKV infection is not solely dependent on AXL, limiting the possibility of developing any therapeutics (32). The vertical transmission and neuropathogenesis mechanism of ZIKV infection in humans is shown in Figure 7.
Figure 7 ZIKV infection mechanisms and neuropathogenesis (ISGs, interferon-stimulated genes; ZIKV, Zika virus) (33). (A) Infection of ZIKV in dermatocytes, (B) Infection of ZIKV in hofbauer cells, (C) Protective immune response of syncytiotrophoblast, (D) ZIKV targeting neural progenitor cells.
Aedes mosquitoes are the probable vector for ZIKV transmission. Figure 7A shows how ZIKV can infect dermal fibroblasts and epidermal keratinocytes, which might then spread the virus to dermal dendritic cells (also known as Langerhans cells) and aid the spread of ZIKV. Figure 7B shows how infection of cytotrophoblasts or transmigration of infected primary human placental macrophages (Hofbauer cells) may result in the transplacental transfer of ZIKV to the fetus, indicating a unique pathway for intrauterine transmission. Hofbauer placental macrophages release type I IFN and increase interferon-stimulated genes (ISGs) in response to ZIKV infection, but the cells still allow ZIKV replication. Figure 7C shows how the placental syncytiotrophoblasts’ production of IFN-λ1 and ISGs during the later stages of pregnancy may have protective effects that prevent ZIKV infection. Figure 7D shows how ZIKV specifically targets neural progenitor cells during the embryonic brain’s development in first trimester. The entry of ZIKV into brain cells may be significantly influenced by the TAM receptor AXL. Deregulation of genes involved in neuronal development and apoptosis brought on by ZIKV-dependent activation of TLR3-mediated immune responses leads to significant damage to the embryonic brain, including microcephaly (33).
Cellular mechanism of ZIKV
ZIKV presumably enters the cell by receptor-mediated endocytosis (28). The endocytosis is either clathrin or receptor mediated. A fusion between the virus and the host cell occurs because of the acidic environment and genomic RNA released inside the host cell. After its release, viral RNA is translated to the polyprotein in the vicinity of the endoplasmic reticulum (ER) with the help of viral-encoded proteins and the host. Later, viral replication and packaging occur on the surface of ER of the host cell. Furin-mediated cleavage occurs at the Golgi complex, resulting in the formation of a mature virus. Virus particles are released with the help of exocytosis, and ZIKV activates a TLR3-mediated immune response and autophagy pathway (34, 35). This may mediate viral survival and replication inside the cell, and then exosomes containing the ZIKV proteins are released by the infected cells (36). ZIKV may activate the unfolded protein response pathway, which may lead to cell death, DNA repair, or homeostasis (37, 38). The cellular mechanism of ZIKV is shown in Figure 8.
Figure 8 Cellular mechanism of ZIKV (created with BioRender.com).
Diagnosis of ZIKV
It is difficult to diagnose ZIKV infections because in more than 80% of cases ZIKV is asymptomatic. The symptoms of ZIKV infection overlap with those of infection with other flaviviruses. To date, five serological assays and 14 molecular diagnostics tests (Table 1), based on serum, saliva, and urine samples collected from patients, have been approved by the United States Food and Drug Administration (FDA) (39). In the case of individuals whose symptoms started within the previous 7 days, ZIKV infection can be diagnosed by subjecting whole blood or serum to an RT-PCR (reverse transcription-polymerase chain reaction) test known as nucleic acid testing (NAT). Enzyme immunoassays (EIAs), immunofluorescence assays (IFAs), and neutralization assays, such as plaque-reduction neutralization tests (PRNTs), are crucial serological diagnostic tools, nonetheless, and should be used in individuals with symptoms that have persisted for more than 7 days (40). Serological assays should be interpreted carefully, as cross-reactivity between dengue and ZIKV antibodies may lead to misidentification of the causative agent, and prior exposure may also give false-positive results. Thus, serological assays alone cannot confirm ZIKV infection (41). Quantitative reverse transcription is used in in vitro diagnostics (IVDs). The most accurate molecular diagnostic method for ZIKV is PCR (i.e., qRT-PCR); however, due to its high cost and mobility issues, its use as a point-of-care (POC) test during monitoring programs is constrained (42). Instead, because of their low cost and simple logistical handling, reverse transcription loop-mediated amplification (RT-LAMP) and microfluidic cassettes are more popular (40, 43). Pregnant women with ZIKV infection living in endemic areas and with a history of clinical illness should undergo routine ultrasound scans in early pregnancy to check for abnormalities or fetal malformation (44). In pregnant women, ZIKV infection should be diagnosed based on laboratory evidence. Detection of RNA in blood and urine confirms ZIKV infection, whereas detection by IgM testing may give a false-positive result because of prior infection (41).
Treatment of ZIKV
As yet, no specific vaccine against ZIKV infection is available, and treatment includes symptomatic care, for example, plenty of water intake, rest, antipyretics, and analgesics (45). ZIKV vaccine development is the subject of extensive study and includes several vaccine types, e.g., DNA-based vaccines, subunit vaccines, inactivated vaccines, and live-attenuated vaccines (46). Some antiviral drugs are also prescribed against ZIKV. GBS can be treated by intravenous injection of immunoglobins (0.4 g/kg body weight daily for 5 days) and by plasma exchange (200–250 ml plasma/kg body weight in five sessions) (47).
Antiviral drugs
A variety of methods have been used to find medications that can fight ZIKV infection. Despite the serious consequences for public health, there is presently no cure or medicine to prevent ZIKV infections. On the basis of mode of action, ZIKV antivirals can be classified into host-directing antivirals and direct-acting antivirals. Efforts to develop effective antiviral drugs have focused on drug repositioning, as this minimizes the number of clinical trial steps. The search for drugs suitable for repositioning has helped pregnant women and newborns to withstand the outbreaks of ZIKV (48, 49). Of the repositioning drugs listed in Table 2, only temoporfin can be given to pregnant women (49). The anti-ZIKV medications sofosbuvir, chloroquine, and suramin produced better outcomes because more experimental data were available for evaluation (48). To facilitate the search for and increase the chances of finding a suitable anti-ZIKV medicine, other medications’ effectiveness against ZIKV should also be assessed.
Table 2 Repositioned anti-ZIKV drugs.
ZIKV vaccines
ZIKV infection induces both innate and adaptive immune responses. The innate immune response is the first line of defense against ZIKV. ZIKV infection triggers type I interferons and signaling, which may inhibit ZIKV, but ZIKV exhibits different mechanisms to interfere with IFN induction. Non-structural proteins play an important role in IFN inhibition. The humoral immune response is protective against ZIKV, and specific neutralizing antibodies are produced against the E protein. Vertical transmission is inhibited by recognizing a quaternary epitope on the E protein dimer–dimer, by recognizing the lateral ridge epitope of domain III of the E protein, and by recognizing a quaternary epitope spanning all three domains of the E protein. However, this may lead to the enhancement of dengue virus replication and a phenomenon known as ADE (i.e., antibody-dependent enhancement) (72). Therefore, the vaccine must be designed by taking into consideration the phenomenon of ADE. In addition, understanding the correlation between immunity and infection is difficult, as different levels of adaptive immune response also differ from individual to individual, depending on age, sex, and health conditions, and correlation also differs in animal models, making it difficult to understand the effect on human beings, especially neonates, as ethical issues will be faced. Despite these shortcomings and limitations, many vaccine candidates have been developed to fight against ZIKV. Developing a safe and effective vaccine against ZIKV will help in preventing the spread of ZIKV, and save people from its adverse effects. Various kinds of vaccines against ZIKV infection, for example, DNA vaccines, mRNA vaccines, live-attenuated vaccines, virus-like protein vaccines, subunit vaccines, virus-vectored vaccines, and purified inactivated vaccines, have been tested in preclinical studies in non-human primates and in clinical trials in humans (Tables 3, 4).
Table 3 Different pre-clinical studies of ZIKV vaccine.
Table 4 ZIKV vaccines that are currently undergoing clinical trials (103).
Preventive measures for ZIKV
As there is no treatment, prevention is the best method of protecting against ZIKV, either by protection from mosquito bites or by controlling the vector population (105). In ZIKV-prone areas, populations should be controlled by using mosquito repellents, such as DEET (N,N-diethyl-m-toluamide), bed nets, window screens, and applying permethrin cream on skin and clothes (106). At the moment, the best method for preventing and controlling arboviral infections such as Zika is comprehensive vector management. Vector management includes environment management practices such as destroying breeding sites (e.g., stagnant water, dumping grounds, landfill sites) by spraying larvicides and insecticides (105). Prevention of the sexual transmission of ZIKV requires the use of reliable contraceptives or abstinence at the time of ZIKV infection (107). All of these are temporary methods, as mosquitoes are becoming insecticide resistant. A safe and effective vaccination or antiviral medication is, thus, required to treat ZIKV infection permanently.
Conclusion
The re-emergence of ZIKV has frightened the world. Although there are now fewer cases, there remains the risk of outbreaks in the future. There is uncertainty about the occurrence of ZIKV. Scientists, governments, public health officials, and pharmaceutical companies should come together and prepare to fight strongly the next ZIKV outbreak. There is a need for a safe and effective vaccine to fight against ZIKV, as there are some unknown mechanisms that help the virus to escape. It is possible that the ability of the virus to vertically transmit in mosquitoes, and its increasing vector competency, helps it to cope with harsh conditions and re-emerge as an outbreak. More studies should be carried out in this context. Understanding the interaction between the host and ZIKV will also help in developing different therapeutics against ZIKV infection. There is a need for more effort to prevent and treat ZIKV. Vaccine development and the use of vaccines against any pandemic depends on factors such as animal models for preclinical studies, validation of vaccines by assuring their safety (including safety for pregnant women and neonates), production at massive levels, and clinical trials. More studies should be conducted to determine the effects of vaccines on pregnant women, fetal development, infants, and elderly individuals. As some vaccines are under clinical trial, they should be tested further for any side effects. Work/tests must also be carried out to bring a ZIKV vaccine to licensure and public use. As cases of ZIKV have significantly reduced, a controlled human infection model should be developed to test the efficacy and correlation in humans; however, due to a lack of support, it has become difficult to develop such models. This will adversely affect ZIKV vaccine development projects and can threaten the public in the event of a sudden outbreak, as was seen in the case of COVID-19. Therefore, there is a need for a scientific society that can predict outbreaks and prepare to fight against such outbreaks.
Author contributions
ND: manuscript drafting, writing, and reviewing. MY: information collection, reviewing the manuscript, and editing. HS and RJ helped in reviewing and editing. NS: manuscript conceptualization, reviewing, and editing. All authors contributed to the article and approved the submitted version.
Acknowledgments
The authors are grateful to Maharshi Dayanand University for providing University Research Scholarship to ND and MY.
Conflict of interest
The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.
Publisher’s note
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Keywords: transmission, vaccines, therapeutics, Zika (ZIKV), epidemiology
Citation: Dahiya N, Yadav M, Singh H, Jakhar R and Sehrawat N (2023) ZIKV: Epidemiology, infection mechanism and current therapeutics. Front. Trop. Dis 3:1059283. doi: 10.3389/fitd.2022.1059283
Received: 01 October 2022; Accepted: 07 December 2022;
Published: 23 January 2023.
Edited by:
Bapi Pahar, Integrated Research Facility (NIH), United StatesReviewed by:
Luis Del Carpio-Orantes, Delegación Veracruz Norte, MexicoRicardo Palacios, GlaxoSmithKline, Italy
Copyright © 2023 Dahiya, Yadav, Singh, Jakhar and Sehrawat. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
*Correspondence: Neelam Sehrawat, neelamsehrawat@mdurohtak.ac.in