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A review of the recent advances on Lassa fever with special reference to molecular epidemiology and progress in vaccine development

1Medugu, N., *1Adegboro, B., 2Babazhitsu, M. S., 3Kadiri, M., and 4Abanida, E. A.

1Departments of Medical Microbiology and Immunology, Nile University of Nigeria, Abuja, Nigeria

2Department of Medical Microbiology and Parasitology, Faculty of Basic Clinical Sciences, College of Health Sciences, Usmanu Danfodiyo University, Sokoto, Nigeria

3Department of Medical Microbiology and Parasitology, University of Ilorin Teaching Hospital, Ilorin, Nigeria 4Epidemiology Unit, World Health Organization, Harare, Zimbabwe                                             

*Correspondence to: boazadegboro@gmail.com

Abstract:

Lassa fever, a viral hemorrhagic fever caused by the Lassa virus (LASV), is endemic in West Africa and is associated with high morbidity and mortality. At least three of the four proposed seven lineages of LASV are found in Nigeria, where the multimammate rat, Mastomys natalensis, serves as the primary reservoir. Endemic countries report approximately 200,000 infections and 5,000 deaths annually, with Nigeria experiencing thousands of infections and hundreds of deaths including healthcare workers. The aim of this review is to provide scientific information for better understanding of the evolutionary biology, molecular epidemiology, pathogenesis, diagnosis, and prevention of Lassa fever in Nigeria and other endemic regions worldwide, which can lead to improved control efforts and reduce morbidity and mortality from recurrent epidemics. To achieve this aim, observational studies such as case series, cross-sectional and cohort studies published between December 2017 and September 2022 were searched for on various online databases including Google Scholar, Africa Journals Online (AJOL), Research Gates, PubMed, PMIC, NCDC, and WHO websites. Although the origin and evolutionary history, and the transmission dynamics of Lassa virus have been revealed through recent molecular epidemiological studies, the factors that drive the evolution of the virus remain unclear. Genetic changes in the viral genome may have enabled the virus to adapt to humans. Diagnosis of Lassa fever has also advanced from basic serological tests to more sophisticated methods such as quantitative real time polymerase chain reaction (qRT-PCR) and sequencing, which are particularly useful for identifying outbreak strains. Several vaccines, including recombinant vesicular stomatitis virus (rVSV), virus-like particle (VLP), and DNA-based vaccines, have shown promise in animal models and some have progressed to phase 2 clinical trials. Preventing and controlling Lassa fever is critical to safeguard the health and well-being of affected communities. Effective measures such as rodent control, improved sanitation, and early detection and isolation of infected individuals are essential for reducing transmission. Ongoing research into the genetic and ecological factors that drive the evolution of Lassa virus is necessary to reduce the impacts of Lassa fever. Continue reading “A review of the recent advances on Lassa fever with special reference to molecular epidemiology and progress in vaccine development”

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Marburg haemorrhagic fever: recent advances

B AdegborO, OA Adeola

 

Abstract

Viral hemorrhagic fevers (VHFs) are a group of etiologically diverse viral diseases unified by common underlying pathophysiology. These febrile diseases result from infection by viruses from four viral families: Arenaviridae, Bunyaviridae, Filoviridae, and Flaviviridae. The viruses in the four families are all RNA viruses. All share the feature of having a lipid envelope. Survival and perpetuation of the viruses is dependent on an animal host known as a natural reservoir, but humans are not the natural reservoir. With the exception of a vaccine for yellow fever and ribavirin, which is used for treatment of some arenaviral infections, no specific chemotherapy for viral hemorrhagic fever exists. Only supportive treatment is possible The filoviruses, Marburg virus (MARV) and Ebola virus (EBOV), have been associated with hemorrhagic fever (HF) that produce severe disease and high mortality rates among infected humans and non-human primates. MARV and EBOV are also considered potential biological weapons. Although much progress has been made in developing preventive vaccines and postexposure interventions that can protect laboratory animals and nonhuman primates against lethal challenge with MARV, none of these has been approved for humans. Because MARV haemorrhagic fever, when it occurs, has the potential to spread to other people especially health care staff and family members who care for the patient, there is need for periodic review of recent developments relating especially to its diagnosis and treatment. This would help to increase awareness among health-care providers and limit the spread of the disease during outbreaks.

Keywords: Marburg virus, viral haemorrhagic fever, recent advances

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Marburg haemorrhagic fever recent advances