Is the ZIKV Congenital Syndrome and Microcephaly Due to Syndemism with Latent Virus Coinfection?

The emergence of the Zika virus (ZIKV) mirrors its evolutionary nature and, thus, its ability to grow in diversity or complexity (i.e., related to genome, host response, environment changes, tropism, and pathogenicity), leading to it recently joining the circle of closed congenital pathogens. The causal relation of ZIKV to microcephaly is still a much-debated issue. The identification of outbreak foci being in certain endemic urban areas characterized by a high-density population emphasizes that mixed infections might spearhead the recent appearance of a wide range of diseases that were initially attributed to ZIKV. Globally, such coinfections may have both positive and negative effects on viral replication, tropism, host response, and the viral genome. In other words, the possibility of coinfection may necessitate revisiting what is considered to be known regarding the pathogenesis and epidemiology of ZIKV diseases. ZIKV viral coinfections are already being reported with other arboviruses (e.g., chikungunya virus (CHIKV) and dengue virus (DENV)) as well as congenital pathogens (e.g., human immunodeficiency virus (HIV) and cytomegalovirus (HCMV)). However, descriptions of human latent viruses and their impacts on ZIKV disease outcomes in hosts are currently lacking. This review proposes to select some interesting human latent viruses (i.e., herpes simplex virus 2 (HSV-2), Epstein-Barr virus (EBV), human herpesvirus 6 (HHV-6), human parvovirus B19 (B19V), and human papillomavirus (HPV)), whose virological features and co-exposition with ZIKV may provide evidence of the syndemism process, shedding some light on the emergence of the ZIKV-induced global congenital syndrome in South America.

Conocimientos y actitudes sobre el zika en gestantes del sur de Lima, Perú / Knowledge and attitudes about Zika in pregnant women from the south of Lima, Peru

RESUMEN OBJETIVOS: determinar el conocimiento y las actitudes sobre el Zika en gestantes del sur de Lima MÉTODO: Estudio transversal analítico. Se incluyeron gestantes que acudieron al establecimiento de Salud Materno Infantil de Villa María del Triunfo durante octubre del 2017. RESULTADOS: Participaron 97 gestantes, la edad promedio fue de 28,23±7,9. El mayor grupo de edad fue de 16-28 años (54,6%). Al realizar la categorización del nivel de conocimientos, apreciamos que la mayoría tuvo conocimientos buenos sobre la enfermedad (78,4%) y todas tuvieron actitudes positivas. Las gestantes con mayor nivel educativo tuvieron un mejor conocimiento de la enfermedad (p<0,001) CONCLUSIONES: El conocimiento y las actitudes de las gestantes sobre el zika, fueron por lo general buenos.

ABSTRACT OBJECTIVES: To determine knowledge and attitudes about Zika in pregnant women from southern Lima. METHOD: Cross-sectional analytical study. Pregnant women were included who attended the Maternal and Child Health center in Villa María del Triunfo during October 2017. RESULTS: 97 pregnant women participated, the average age was 28.23 ± 7.9. The largest age group was 16-28 years (54.6%). When categorizing the level of knowledge, we appreciate that most had good knowledge about the disease (78.4%) and all had positive attitudes. Pregnant women with a higher educational level had a better knowledge of the disease (p <0.001). CONCLUSIONS: The knowledge and attitudes of the pregnant women about Zika were generally good.

In silico analysis revealed Zika virus miRNAs associated with viral pathogenesis through alteration of host genes involved in immune response and neurological functions.

BACKGROUND: The concurrent Zika Virus (ZIKV) outbreaks in the United States and Northeast Brazil have evoked global surveillance. Zika infection has been correlated with severe clinical symptoms, such as microcephaly, Guillain-Barré syndrome, and other congenital brain abnormalities. Recent data suggest that ZIKV predominantly targets neural progenitor cells leading to neurological impairment. Despite the clinical evidence, detailed experimental mechanism of ZIKV neurotropic pathogenesis has not been fully understood yet. Here we hypothesized that ZIKV produces miRNAs, which target essential host genes involved in various cellular pathways facilitating their survival through immune evasion and progression of disease during brain development. METHODS: From genome sequence information using several bioinformatic tools, we predicted pri-miRNAs, pre-miRNAs, and finally the mature miRNAs produced by ZIKV. We also identified their target genes and performed functional enrichment analysis to identify the biological processes associated with these genes. Finally, we analyzed a publicly available RNA-seq data set to determine the altered expression level of the targeted genes. RESULTS: From ZIKV genome sequence, we identified and validated 47 putative novel miRNAs. Functional enrichment of the targeted genes demonstrates the involvement of various biological pathways regulating cellular signaling, neurological functions, cancer, and fetal development. The expression analysis of these genes showed that ZIKV-produced miRNAs downregulate the key genes involved in these pathways, which in turn may lead to impaired brain development. CONCLUSIONS: Our finding proposes novel ZIKV miRNAs and their targets, which upon experimental validation could help developing new therapeutics to combat ZIKV infection and minimize ZIKV-mediated pathologies.