Vector Borne Diseases: Current Trends and Public Health Perspectives

 Insects, including mosquitoes, employ different strategies for survival and reproduction. They use physical properties like contact angles and surface tension for water repellency, surface adhesion, locomotion on various terrains, feeding, and defense. Surface tension ensures mosquito survival during developmental stages in aquatic environments. The symbiotic relationship between physics and mosquito biology, which has led to the development of intricate mechanisms, has to be explored. Ongoing research promises innovative strategies for countering these disease vectors. 

This chapter investigates the correlation between rodents and rickettsial bacteria and their devastating environmental impact. We unveil the diverse tapestry of rodent species acting as reservoirs for these hidden pathogens, exploring the role of fleas and ticks in orchestrating their spread. The narrative delves into the ecological equilibrium woven by rodents, unraveling the consequences their decline may have on nutrient cycling, seed dispersal, and predator-prey relationships. As rickettsiae wreak havoc on rodent populations, we witness the domino effect on plant communities, biodiversity, and ecosystem stability. Uncovering the science behind this destructive dance empowers us to develop strategies for restoring balance and safeguarding the ecosystems that sustain us all.

The emerging cases of Scrub typhus being reported across the globe are constituting a major public health concern to control and reduce the burden of disease among the population. Scrub typhus, a vector-borne zoonotic disease with a mortality of 30%, has now been reported worldwide, affecting billions of people annually. Though the clinical symptoms and signs of Scrub typhus are similar to those of many other viral and bacterial fever illnesses, Scrub typhus falls under the category of Fever of Undifferentiated Febrile Illness (UFI), which provides physicians with a big challenge to exactly detect and diagnose the disease. The invasion of bacterial pathogens into the body is infinite and non-specific, there are cases reported of Scrub typhus co-infected with other vector-borne diseases such as Dengue, Leptospirosis, and Next-generation Sequencing would provide us with high sensitivity and specificity. Ongoing research is crucial in improving our understanding of co-infections and developing effective strategies for their prevention, diagnosis, and treatment. Addressing the challenges, timely diagnosis and treatment of co-infected cases requires a multidisciplinary approach involving clinicians, microbiologists, epidemiologists, and public health experts under one umbrella.

 Scrub typhus, caused by the bacterium Orientia tsusugamushi, is one of the major public health challenges in various regions. The onset of multi-omics technology has improved our understanding of infectious diseases, including Scrub typhus. This chapter provides the application of multiomics approaches, which integrate genomics, transcriptomics, proteomics, metabolomics, and beyond, to decipher the complexities of Scrub typhus disease. Genomic analysis allowed the identification of genetic variation in Orientia tsusugamushi strains, shedding light on virulence factors and host-pathogen interactions. Transcriptomic studies have elucidated the dynamic gene expression patterns during infection, providing insights into the molecular mechanisms underlying pathogenicity. Proteomic analyses facilitated the identification of key proteins involved in host manipulation and immune evasion. Furthermore, metabolomic profiling has provided a comprehensive view of the metabolic changes in both the host and the pathogen during infection. The combination of these multi-omics datasets has the potential to identify complex interactions and biomarkers associated with Scrub typhus development. This chapter highlights the ongoing research of Scrub typhus through the lens of multi-omics technology, which focuses on the importance of a holistic approach to profound knowledge about the disease and the development of targeted interventions.

India bears a significant burden of Lymphatic Filariasis (LF) as one of the countries with the highest prevalence globally. The prevalence of LF in India is fueled by a complex interplay of socio-economic factors, inadequate healthcare infrastructure, and environmental conditions conducive to mosquito breeding. The disease primarily affects the lymphatic system, leading to severe and disfiguring manifestations such as lymphedema, elephantiasis, and hydrocele. These debilitating conditions not only impact the physical health of individuals but also contribute to social stigmatization and economic hardships. India has undertaken commendable efforts to combat LF through mass drug administration (MDA) campaigns, which involve the distribution of antifilarial drugs to entire at-risk populations. However, challenges such as incomplete coverage, drug compliance, and the persistence of transmission in certain areas hinder the success of these initiatives.