- Open Access
ChikDenMaZika Syndrome: the challenge of diagnosing arboviral infections in the midst of concurrent epidemics
© The Author(s) 2016
- Received: 28 June 2016
- Accepted: 8 July 2016
- Published: 22 July 2016
Arthropod-borne viruses are becoming and increasing threat worldwide, especially in the New World, which has recently witnessed an unprecedented outburst of Arboviral outbreaks [1–4], such as the recent and ongoing chikungunya (CHIKV)  and Zika (ZIKV)  epidemics throughout the Pacific and the Americas. These emerging viral infections are largely due to a number of factors such as climate change [5–7], ever-increasing trends towards urbanization and growing travel and commercial exchange activities [8–12]; which have led to a spillover of these pathogens from their naturally occurring sylvatic niches and reservoirs into susceptible urban settings and newly unexposed geographic areas [13–16].
Other arbovirus such as yellow fever (YFV) and dengue (DENV) [6, 17], have been circulating for longer in the American continent exhibiting endo-epidemic cycles influenced by a number of enabling drivers such as poor socioeconomic conditions, climate variations, migration from rural to urban locations, among others [3, 4, 6, 7, 11–13, 17]. The complex but at the same time suitable eco-epidemiological conditions of tropical and subtropical regions has privileged the persistence of arboviruses by providing an ideal blend in terms of vector usage and specificity as well as an ample host range. Actually, newly introduced arboviruses in the New World seem to be smoothly transitioning from their epidemic effervescence into endemic levels of transmission revealing an increased potential for adaptation [1–3, 16].
Arboviruses in Latin America include a number of pathogens belonging to different families such as the Flaviviridae (DENV and ZIKV) [3, 18], Togaviridae (CHIKV and MAYV) [16, 19–21], and Bunyaviridae (Oropouche virus, OROV)  just to name a few; with their biologic behavior and pathogenicity exhibiting distinct features but also great similarities. In particular, for ZIKV, the fact that this virus along with its recent introduction has also found a naïve population with no pre-existing endemic cycles in the region, appears to have pressed for the appearance of new variants with an increased pathogenic potential such as recently observed in the evolving epidemic with a disproportionate number of atypical clinical manifestations and complications not seen before elsewhere [2, 9, 23, 24].
Edema in limbs
Moreover, clinical findings and differentiation among arboviral infections becomes a more complicated task when dealing with special populations such as pregnant women and children, due to their tendency to develop perinatal complications, particularly in CHIKV and ZIKV infections [26, 27].
In addition, cocirculation and coinfection with different arboviruses is becoming a common phenomenon with cases reported from Africa (Nigeria and Angola, where an epidemic of YFV is ongoing, with imported cases to other continents) [28–30], the Caribbean (Haiti) , South America (Brazil and Colombia) [18, 32], and the Pacific (New Caledonia) . Also, cases of coinfection with other endemic pathogens such as malaria (still a public health threat in areas of South East Asia and Latin America) , as well as other viral illnesses such as HIV are being increasingly reported [34, 35]. The broad range of possible coinfecting agents and the non-specific signs and symptoms at the initial stages of infection complicate even more the diagnostic approach to these cases, beyond the clinical aspects, implying as well the needs for the so called multiplex diagnostic tools .
Interestingly, confounding diagnosis between pathogens exhibiting similar clinical features and common geographical and epidemiological grounds, is not an uncommon scenario. For example, in several Asian countries were hepatorenal syndrome causing-hantavirus is endemic, there is usually a significant overlap of symptoms with cases of leptospirosis and infection by the scrub-typhus causative agent Orientia tsutsugamushi. Given the similar clinical features and the variable but notable immune-reactivity to these agents revealed by seroepidemiological studies, the term “Lepthangamushi” was adopted to describe this overlapping clinical syndrome .
Efforts should focus on the necessity to contain the ongoing concurrent epidemics (Fig. 1) and to maintain strict and continued surveillance programs to monitor the spread of these viruses as well as the introduction of newly emergent pathogens [3, 13, 16]. In the field as well as in low-income and remote areas, clinicians should take into consideration the overlapping clinical features shared amongst these agents as well as the possibility of co-infection in their differential diagnosis. Hopefully the term “ChikDenMaZika syndrome” will provide clinicians with a useful mnemonic tool that would aid in narrowing-down diagnosis when faced with arboviral-like disease symptoms such as fever, maculopapular rash, arthralgias, myalgias and non-purulent conjunctivitis (or conjunctival hyperemia). Such multi-agent targeted approach in clinical diagnostics should also be extrapolated to the laboratory bench by improving the usage of multiplex RT-PCR diagnostic platforms for arboviruses in returning travelers , as well as residents of endemic areas, given the increasing reported frequency of co-circulation of multiple arboviruses and its emerging threat in tropical regions .
The authors declare that they have no competing interests.
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