The Nipah virus (NiV) is a virulent zoonotic disease associated with high fatality rates. It emerges predominantly in South East Asian nations, where it typically forms small clusters of infection, and often manifests as encephalitis or acute respiratory distress. The Indian states of West Bengal and Kerala have documented instances of NiV, with Kerala experiencing four of India’s six reported outbreaks.
This detailed study examines the epidemiology of the NiV infection in Kerala, drawing out insights for the formulation of future policies. Three out of the four NiV outbreaks in Kerala struck a specific geographic belt, which implies a consistent factor causing the spillover of infection from reservoir bats, the virus’s natural host. The average age of those affected was 41 years, with more male than female victims. The mean incubation period was about nine days, and the main transmission route was within healthcare settings, reflecting gaps in infection prevention and control practices.
Despite challenges with diagnosis and treatment, the state was able to react effectively to these outbreaks by implementing intensive response strategies, such as case isolation, contact tracing, and surveillance. These strategies were applied uniformly across all outbreaks, along with the advancement of the state guidelines for outbreak response.
The initiation of preventative measures, such as better infection control practices, quicker diagnosis techniques, and more advanced treatment options is emphasized. Additionally, the adoption of robust surveillance systems notably for acute encephalitis syndrome (AES) and acute respiratory distress syndrome (ARDS) is also underscored. This would enable early detection and control of potential outbreaks, thereby mitigating the impact of future outbreaks in the region.
India’s most recent outbreak of the Nipah virus infection occurred in September 2023 in Kerala’s locale, confirming that NiV is an emerging infectious disease of public health importance in the South-East Asian region. Methods such as Serum Neutralization antibody detection, Enzyme-linked immune sorbent assay (ELISA), or Real-time reverse transcriptase-polymerase chain reaction (RT-PCR) tests provide lab confirmation. However, NiV must be handled within a Bio-safety level 4 containment facility, which is lacking in many South East Asian countries.
Evaluation of the recurring NiV occurrences in Kerala raises critical questions about transmission dynamics and offers pivotal understandings to inform future actions. Practical measures include heightened surveillance, better index of suspicion for febrile illnesses, awareness campaigns among communities, and integrated ‘One Health’ investigations. Recognizing the value of strong political commitment and community participation is also necessary, as is harmonizing the efforts of various sectors such as human health, animal health, environment, education, and media.
Source: https://www.frontiersin.org/journals/public-health/articles/10.3389/fpubh.2024.1356515/full