Infectious diseases are caused by biological agents such as viruses, bacteria, fungi or prions and are transmitted either directly or indirectly from one individual to another (1). The emerging infectious diseases (EIDs) have appeared from time to time and contributed to a crucial global burden impacting both the public health and economy in many countries around the world. The global trends explicitly indicate an upsurge and inflation in the total number of outbreaks, disease richness (number of unique diseases), disease diversity (richness and outbreak evenness), and per capita cases (2). EIDs are gaining momentous global attention as it is principally attributable to pathogens infiltrating the human population for the first time or due to the reintroduction of historically existing pathogens in humans, which recently came into light or increased in incidence (3, 4).

In recent years, more than 84 countries have reported and experienced unprecedented resurfacing of zika virus outbreaks globally. The disease has spread vastly throughout the continents of Africa, from Asia to a Pacific island, South America, regions of Europe, and North America (5). Zika virus is an enveloped single-stranded, positive-polarity RNA virus classified under the Flaviviridae family of viruses, genus Flavivirus, and was first isolated from the Zika Forest of Uganda (6, 7). Zika virus is icosahedral and has a non-segmented, single-stranded, 10-kilobase, positive-sense RNA genome (8). The genetic analysis indicated two main lineages, reportedly the African lineage and the Asian lineage (9).

Zika virus was first isolated in the year 1947 from the blood sample of a sentinel Rhesus monkey No. 766 (7). Zika was originally identified in humans in the year 1954, with strains evident in Nigeria in cases reported with mild febrile illness (10). The first massive outbreak was recorded in the island of Yap (Federated States of Micronesia) in 2007, and in 2013–2014 epidemic outbursts were observed in New Caledonia, French Polynesia, the Cook Islands, Easter Island, Vanuatu, and Samoa. Recent outbreaks were seen during 2015 in Brazil and 31 countries in the Americas in 2016 (11). The transmission cycle of zika virus embraces the coexistence of two cycles, sylvatic cycles and urban cycles, with one another and mixing with the zone of emergence (12). Zika follows an enzootic-transmission from mosquito to non-human primate/monkey and then to humans following the bite of an infected mosquitos (13).

Zika virus infection maybe asymptomatic and the clinical manifestations of the infection ranges from a mild to severe form of illness and complications. Although the symptoms are moderate and comprise of fairly mild-infection with pyrexia, asthenia, headaches, or myalgia, it may occasionally include a maculopapular rash and/or conjunctivitis (14). Zika is suspected to cause abortions, congenital anomalies such as microcephaly, Guillain-Barré Syndrome (GBS) and neurological defects that are collectively termed congenital zika syndrome (CZS) (15). Unanswered questions and queries remain in this area of research on CZS in recent years. Quantitative estimates from 2013-15, coupled with case scenarios reported in 2015 (fetal autopsy, fetal imaging, pathological and virologic analyses), underscore a potential correlation between zika viral infection in pregnancy and fetal malformations. Microcephaly is a cephalic disorder with cerebral atrophy and ventriculomegaly, extensive intracranial calcifications, simplified gyral patterns, dysgenesis of the corpus callosum, and cerebellar hypoplasia (16). GBS is an autoimmune disorder characterized by damage to peripheral nerves resulting in life-threatening muscle weakness in the extremities and upper body, and as the disease progresses it fatally affects the respiratory muscles (17).

The diagnosis of zika virus is by a blood test (reverse transcriptase-polymerase chain reaction RT-PCR) (18). For a pregnant woman, the zika virus Nucleic acid amplification technology assays (ZIKV NAT test), careful evaluation by serial ultrasound examinations and nomograms for fetal head circumference have been introduced (19). There is no specific antiviral medication, treatment or vaccine available to date, apart from supportive care to relieve the symptoms (20). Prevention of zika virus includes vector-control by using mosquito repellent, wearing long-sleeved clothing, removal of household waste and stagnant water, air-conditioning, and usage of door nets and screens, which would prevent from mosquito bites as well as removal of breeding sources (21).

The past years have shown that zika epidemics have affected various parts of the world with a significant public health concern. There were series of unexpected outbreaks, with claims directed towards the sequence of events of microcephaly and Guillain Barre Syndrome associated with zika infection. This research aimed to analyse media reports of zika virus outbreaks globally using data from EpiWATCH outbreaks observatory.


EpiWATCH was developed by the NHMRC Centre for Research Excellence’s Integrated Systems for Epidemic Response (ISER) (22). EpiWATCH is a “semi-automated epidemic observatory” which collects data on disease outbreak or infection at a global level. This platform was designed specifically to explore outbreak analysis, conduct active and rapid surveillance of epidemics, and identify rare/serious emerging and re-emerging infections of public health significance through open-source data such as news reports, social media and other public reports. EpiWATCH employs pre-defined, semi-automated web-queries, the results of which are fine-tuned by researchers who report the relevant information on the outbreaks of the diseases in a timely manner. It also provides watching briefs and outbreak alerts to the broader audience (22).

For this report, outbreak alerts were retrieved using the keywords “zika”, “zika virus”, “microcephaly” and “Guillain-Barre Syndrome”, dated between 1/3/2016 and 5/3/2019. The hypertext documents found in the EpiWATCH database were reviewed and analysed. The non-English reports were translated using Google translate and analysed. In addition, public domain data from the World Health Organization’s (WHO) reports were also examined and validated for the number of reported zika events for the same time period in the study.

Data were collated and analysed by using Microsoft excel 2019. Descriptive epidemiology was conducted to describe the disease trend, complications and geographical distribution of outbreaks of zika infections. software and Microsoft excel 2019 were applied for geolocation tags and geographic heat map in the study. This study used publicly available de-identified data, and thus ethical application was not necessary.


The EpiWATCH database included a total of 120 media reported zika outbreaks, which comprised of 15 duplicate reports, thus forming a final count of 105 reports globally from 2016-2019. This included reports of zika infection from news articles and social media globally. There were 37 reports in 2016, 40 reports in 2017, 24 and 3 reports from 2018 and 2019 respectively 1. Figure 1 below presents the total number of zika outbreaks reports retrieved from EpiWATCH by month and year, 2016-2019. Additionally, the number of media reports and zika cases by country were presented in the appendix, Table A1.

Figure 1 

The total number of zika outbreak reports by month and year, 2016-2019 (EpiWATCH).

EpiWATCH included a total of 120 reports with the highest number of reports available during the months of August and October in 2016, March 2017, and October 2018. There were relatively less number of reports available in other months (Figure 1).

For confirmed zika infections in total, the numbers of reported zika cases were 81,852, 609, 1,800 and 15 from 2016 through to March 2019, respectively. Figure 2 presents the total number of reported zika cases by country from EpiWATCH globally. The geographical distribution of zika infection shows that the infection transmitted across 19 countries during the study period. The geographical distribution has steadily widened. The largest number of reported cases were found in the United States (81,115). A substantially high number of zika cases were also reported from countries such as Thailand (1,044), Mexico (996) and India (671) during that period.

Figure 2 

The total number of reported zika cases by country, 2016-2019 (EpiWATCH).

Note: The number of zika cases are mentioned with respect to relevant years.

Figure 3 

The total number of pregnant women with possible zika infection, 2016-2019* (from EpiWATCH).

* None reported in 2019.

Figure 3 shows the number of pregnant women with zika infection reported by EpiWATCH by year. EpiWATCH database reported microcephaly cases during 2016 and 2017. The highest number of cases reported in the outbreak was seen during 2017, with 67 microcephaly cases. The reported cases from EpiWATCH also included a study of children with microcephaly in Mato Grosso, Brazil, with a total of 351 cases selected through “surveillance protocol”, of which 52 were confirmed (23). Among the 52 confirmed cases, 25 resulted in death during pregnancy or delivery due to microcephaly. There were no reports of zika-related microcephaly in 2018 and 2019 (until March 2019). In 2016, seven cases were reported with Guillain-Barre Syndrome, rare neurological disorder or potential complications by zika virus infection, however, no reported cases were observed to have these symptoms during 2017, 2018 and 2019.

Using the available data from EpiWATCH, Table 1 shows the reported number of cases by transmission mode: travel-associated cases, locally- and sexually- transmitted cases, as well as zika-associated deaths. Zika-associated deaths comprised of deaths due to microcephaly and Guillain Barre Syndrome. Reported deaths were the highest in 2017, which included 25 infant deaths due to abortions during pregnancy or stillbirth during delivery. It was shown that the potential causes of deaths reported during 2016 were also related to Guillain Barre Syndrome.

Table 1

Number of reported zika cases globally by mode of transmission and year, 2016-2019 (EpiWATCH).

Zika cases 2016 2017 2018 2019
Travel-associated cases 1,470 207 3 15
Locally-transmitted cases 267 10 0 0
Sexually-transmitted cases 14 1 0 0
Reported zika-associated deaths 6 25 4 0
Figure 4 

The total number of zika cases by country, 2016-2019, World Health Organization.

Figure 4 shows the incidence of zika by countries from 2016-2019, derived from the situation summary of 2019 – a global overview by the WHO 2. The WHO reported both confirmed and suspected cases of zika infection during this period. A total of 37,699 cases were reported during the year 2016-2018, with Bolivia and Panama having 1,736 and 2,752 suspected cases of zika infection. The WHO reported the highest incidence of microcephaly in 2017, with 44 cases in total. However, there were no reports available during 2019 (24).


This research explores and analyses the zika virus outbreaks globally using the EpiWATCH outbreak data. The total number of zika cases extracted from 2016-2019 were 84,276. Our findings from EpiWATCH showed that the number of zika cases peaked in 2016 and declined substantially from 2017 to 2019, affecting nineteen countries over the period. Most of the zika cases reported by EpiWATCH were from the United States of America, with 81,115 cases in total. Studies have shown that zika virus affects populations across all ages including adults, pregnant women, infants and seniors, with mild to moderate symptoms consisting of fever, muscle cramps, conjunctivitis, birth defects, and muscle paralysis (10, 25). Also, pregnant women are at a high-risk of zika infection and its complications, such as microcephaly (25).

Although zika is recorded as a vector-borne disease, other routes of transmission such as sexual route, perinatal, blood-borne transmission, locally acquired and travel-related cases were also noted and reported by EpiWATCH (26). Our results showed two major routes of transmission, i.e. travel and local-transmission, and indicated that there were higher numbers of travel-related cases throughout 2016 and 2017. This report is suggestive of the importance of diverse control measures, guidelines and the need for developing strategies to protect individuals against zika infection. Some studies have focussed on various transmission routes to mitigate virus circulation in the population (27). A study showed that most of the zika cases were acquired by travel-transmission route in USA. In that study, about 110 individuals affected (96%) were cases of zika infection who had history of travelling to zika prone areas (28). A systematic review also reported a rapid spread of zika infection from travellers (29). It was found that there were a higher number of zika infections in travellers returning to their homelands from zika infected countries.

From the EpiWATCH database, the highest number of reported zika cases were reported in travellers in 2016, followed by locally transmitted cases. This also highlighted the importance of travel advisories, by informing proper precautionary approaches for pregnant women and sexual partners accordingly relevant to their travel destinations. Determining the contribution of travel-associated zika cases emphasises the geographical high-risk regions, along with insights into the existence and level/degree of the risk of transmission in geographical regions. Also, our study highlights the importance of imported cases as it could potentially result in local-transmission of the virus in some regions. From the study’s findings, there is an increasing trend of zika infections observed during the main tourism season (data not shown). Other studies and the Center for Disease Control and Prevention (CDC) also reported similar cases due to travelling and tourism during peak seasons, and travel warnings were being issued to zika virus affected countries in conjunction with other preventive measures (28, 29). The previous geo-sentinel analysis also presented situational similarity to efforts followed during former zika outbreaks (30).

Zika-related deaths were reported in severe cases of Guillain Barre syndrome in adults and older individuals, and some microcephaly in infants. There were cases of fetal deaths and miscarriage/still births, along with severe neurological sequelae causing a deadly paralysis observed in the study (31). On the basis of available evidence from research studies, there is causal association between zika virus and microcephaly and serious neurological anomalies (31, 32). It was explained in the study that the zika virus could breach the placental barrier and transmit the infection, with the indication of virus and its persistence in the placenta (33). Studies also suggest that zika is a classic TORCH (toxoplasma, other, rubella, cytomegalovirus, and herpes) pathogen and that it enters the fetal brain during pregnancy by crossing the placental barrier (34). Another study also demonstrated lucidity towards the plausible suggestion of virus crossing through the maternal placental barrier and developing infection leading to long-term neurological manifestations (35). Additionally, the re-emergence of two major lineages of zika virus, the Asian and African lineages, might contribute to the transmission and the spread of disease in diverse countries (36). Similar findings were reported by the CDC (28, 37).

EpiWATCH documented cases show a quantitative, seasonal surge of zika infection with an increasing number of cases in the United States, India, Mexico, Singapore, Thailand and Vietnam during the wet and rainy seasons, suggesting that the climate setting favours the abundance of vectors for the transmission of zika infections (data not shown). Studies also documented that the epidemic waves lengthened and the upsurge of infection was found during temperate and rainy seasons in tropical and subtropical regions (38, 39). As evident from the results, the epidemiologic inferences from the descriptive data were broadly in line with most other recent studies showing similar outbreaks in the island and coastal regions, in addition to the seasons favouring the breeding of mosquitoes (40, 41).

A comparison of EpiWATCH and the WHO’s database reveals that the WHO covered a broader outreach of areas in collection of zika information. The WHO provided a global overview of zika outbreaks across four of the six WHO regions: African Region, Region of the Americas, South-East Asia Region, and Western Pacific Region. In contrast to EpiWATCH’s chronological report, the WHO provided a comprehensive and cumulative situation summary report in public domain. Thus, it is difficult to analyse year-by-year cases between the two systems. A summary finding from the WHO global overview showed that the highest number of cases were seen in Brazil, followed by the African region, with cases of microcephaly reported in African, West pacific, South-east Asian regions. A comparison by countries reported under the WHO and EpiWATCH shows wider regions and countries covered by the WHO in the year 2016. Correspondingly, EpiWATCH also provided information on zika outbreaks from various countries by gathering a rich database around zika virus infection. The WHO reported the documented zika cases from 2007 through to 2016 across 44 countries, with the highest laboratory-confirmed zika infections from Brazil in 2015. Although significantly high numbers of zika cases were reported in Brazil during 2015/2016 (42, 43), EpiWATCH data did not capture such information, especially from Brazil as anticipated. These could be due to reporting bias in English-language data, as well as the maturity of the EpiWATCH surveillance system, which was developed and piloted in early 2016.

EpiWATCH systematically collects information that is available in public domain and are readily accessible and easy to use with a quick search. The other advantage is that EpiWATCH scans and captures outbreak reports daily and provides a rapid analysis of global disease outbreaks, which assists in early detection and surveillance of emerging and re-emerging infection in a timely manner. Consequently, these data serve as a source of information with regard to disease data, which can then form a valuable basis towards effective use of risk-reduction and management in public health services, thus strengthening public health security. Furthermore, the EpiWATCH database has global news reports and social media feeds from diverse languages, thereby eliminating language barriers in identifying outbreaks and biases through the inclusion of non-English language reports. However, there are some limitations in EpiWATCH, such as biases due to omissions of information leading to data gaps, media bias in selection and coverage of reporting which resulted in either over- or under-reporting of cases, and social desirability bias (with regards to the WHO) due to unwillingness by certain countries in reporting data to the WHO as it may affect the tourism industry and trade (44). However, in this study, data extracted were in an aggregated format, and thus we cannot identify cases by age groups. Moreover, the EpiWATCH system is not automated and is a labour intensive procedure as manual intervention is required in collecting, storing and analysing the data. Thus, techniques such as web crawling, text mining, etc. can be used to overcome those limitations. As a benefit, EpiWATCH could consider effective collaboration with search engine giants like Google to enable various activities through the usage of data miners and web crawlers to extract outbreaks of many diseases and to provide real-time updates globally.


Zika outbreaks significantly changed the world economy with the explosive spread and declaration of a global health emergency for a defined period. Thus, these outbreaks underline the need for continued vigilance of disease detection at a global level. This study provided a global analysis of zika outbreak trends over time in relation to geolocation and epidemiology. Study findings showed that the use of an open-source surveillance system, such as EpiWATCH, could provide information about outbreaks of emerging and re-emerging infection globally in a timely manner. Countries with low healthcare resource settings may have some benefits in adopting such a system in addition to traditional public health surveillance, for early detection and diagnosis of emerging infections to respond to appropriate intervention both locally and internationally.


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Table A1

The number of zika outbreak reports and cases by country, month and year, 2016-2019 (EpiWATCH).

Year Month Country Total-Number of Cases Number of Reports
2016 August USA 11308 9
2016 August Taiwan 1 1
2016 August Italy 1 1
2016 August Singapore 1 1
2016 September USA 0 2
2016 September Singapore 1 1
2016 September Malaysia 12 1
2016 September Thailand 353 1
2016 September Japan 2 1
2016 October Honduras 1 1
2016 October Malaysia 7 1
2016 October USA 31502 3
2016 October Vietnam 12 2
2016 October UK 0 1
2016 October Philippines 19 1
2016 November Palau 1 1
2016 November Vietnam 47 2
2016 November Bolivia 12 1
2016 November Thailand 680 1
2016 December USA 37884 4
2016 December Malaysia 8 1
2017 January Africa 2 2
2017 January Australia 1 1
2017 January Vietnam 212 1
2017 January Honduras 10 1
2017 January USA 3 1
2017 February Mexico 23 1
2017 March Brazil 1 1
2017 March Argentina 3 2
2017 March USA 90 2
2017 March Russia 18 1
2017 March Singapore 6 4
2017 April Singapore 12 4
2017 April USA 10 1
2017 May Singapore 2 2
2017 May India 3 2
2017 June Singapore 2 1
2017 June USA 140 2
2017 July Thailand 11 1
2017 July USA 1 1
2017 July Singapore 1 1
2017 August USA 3 4
2017 August Italy 1 1
2017 September Italy 1 1
2017 November USA 2 2
2018 February USA 0 1
2018 July Taiwan 1 1
2018 August Brazil 0 1
2018 September India 1 2
2018 October India 135 8
2018 October USA 158 3
2018 November India 252 4
2018 November Mexico 723 2
2018 December Mexico 250 1
2018 December India 280 1
2019 February French Polynesia 0 1
2019 February Taiwan 1 1
2019 March USA 14 1