The Association of SARS-CoV-2 Infection and COVID-19 Vaccination With Sudden Death: An Explorative Review.

Publication date: Aug 01, 2025

Since its discovery, the novel severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), the causative agent of coronavirus disease 2019 (COVID-19), has become the epicenter of public health concern. This was mainly attributed to the complexity of COVID-19 that resulted in variable disease progression with some developing asymptomatic infections, some suffering mild to moderate infections that resolved without the need for hospitalizations, and a few infected persons developing severe infections that required intensive care unit (ICU) admission and mechanical ventilation. The COVID-19 pandemic spread globally, affecting billions of people and killing millions. Most of the consequences were related to the novelty of the virus, poor understanding of its pathogenesis, and the lack of a specific antiviral drug and vaccine. The vaccines, although manufactured and made available to the public, were approved for emergency use before the completion of human clinical trials. Moreover, the continuous emergence of viruses following mutations resulted in the emergence of viral variants. This has led to doubts over the efficacy of vaccines. Vaccine inequity, represented by the disproportionate availability and distribution of vaccines among the rich and poor, concerns over long-term safety, and hesitancy, affected COVID-19 vaccination, thereby increasing the spread of SARS-CoV-2. Although the COVID-19 pandemic is no longer considered a public health emergency of international concern (PHEIC), the repercussions of the pandemic are still evident in the form of long COVID and post-COVID functional health status (PCFHS), wherein individuals who were previously infected continue to suffer organ dysfunction, primarily affecting the lungs and other organs of the body. During and after the pandemic, COVID-19 and probably vaccination were attributed to the death of many individuals, which were categorized as sudden death (SD) and sudden unnatural death (SUD). It is unclear if these deaths were a result of previous SARS-CoV-2 infection and prior COVID-19 vaccination or both. There are several instances of infected and recovered individuals who were healthy but suddenly developed complications and died. Through this explorative review, we aim to comprehend the role that SARS-CoV-2 infection and/or COVID-19 vaccination play in predisposing people to cardiovascular system (CVS) and central nervous system (CNS) disorders that can result in SD and SUD.

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