Recent research has suggested that climate change could play a significant role in the transmission of Lassa fever. Endemic to certain regions of West Africa, there are concerns that due to changing environmental conditions, this zoonotic disease could spread to central and eastern parts of the African continent over the next 50 years.
The research findings have projected a staggering 600% increase in the number of people exposed to the virus that causes Lassa fever, with potential exposure reaching 453 million people by 2050 and 700 million by 2070, from a current figure of roughly 92 million.
Interestingly, about 80% of infections are mild or asymptomatic, while the remaining 20% can lead to severe symptoms including mouth and gut haemorrhaging, low blood pressure, and even permanent hearing loss. The study identified temperature, rainfall, and the presence of pastureland as key factors contributing to the transmission of the Lassa virus.
The Nature of Lassa Fever
Originating in West Africa, the Lassa fever-causing virus was first discovered in 1969 in Lassa, Nigeria. It is a single-stranded RNA virus from the Arenaviridae family of viruses.
This fever is primarily found in Sierra Leone, Liberia, Guinea, and Nigeria and is usually transmitted by Mastomys rats. The overall death rate from this disease is relatively low, at around 1%. However, for specific groups such as pregnant women in their third trimester, the mortality rate increases.
Transmission and Symptoms
Lassa fever usually spreads through contact with household items or food contaminated with the urine or feces of an infected rat. Transmission from human to human is rare, but it can occur if someone comes into contact with a sick person’s infected bodily fluids.
The symptoms of Lassa fever can range from mild to severe. Early symptoms may include a slight fever, fatigue, weakness, and headaches. Severe symptoms can involve bleeding, difficulty breathing, vomiting, facial swelling, pain in the chest, back, and abdomen, and shock. Death from the disease typically occurs around two weeks after symptoms first appear, usually due to multi-organ failure.
Treatment Options
Treatment for Lassa fever usually involves the antiviral drug ribavirin, which is most effective if given early on in the course of the illness. Unfortunately, there are currently no vaccines licensed for the prevention of Lassa fever.
Understanding Viruses: Preliminary Examination Question
This article will conclude with an examination question from the UPSC Civil Services Examination, concerning the nature of viruses. The question presents two statements about adenoviruses and retroviruses and asks which, if either, is correct.
The question demonstrates that understanding the nature of various viruses and their transmission methods is crucial, not just from a public health perspective, but also for academic study and professional examinations. The explanation provided expands upon this understanding by distinguishing adenoviruses and retroviruses, drawing attention to their distinct characteristics and disease associations. Ultimately, this knowledge helps broaden our understanding of viruses like Lassa fever and how they may be affected by broader environmental changes such as climate change.
Last Modified: February 18, 2024