What is Hantavirus?
Hantavirus, a family of viruses originating from rodents, can cause severe and potentially fatal illness in humans. Interestingly, the rodents themselves
typically do not show symptoms when infected. These viruses are transmitted through the urine, droppings, and saliva of infected rodents. While human-to-human transmission is rare, the Andes strain, found in Argentina and Chile, has shown some instances of person-to-person spread, which is suspected in the current MV Hondius incident. The specific type of hantavirus is often linked to the rodent species native to a particular region. Two main forms of hantavirus disease exist: Hantavirus Pulmonary Syndrome (HPS), prevalent in the Western Hemisphere and caused by New World hantaviruses, is particularly deadly, affecting a third of those who develop respiratory issues. The other form, Haemorrhagic Fever with Renal Syndrome (HFRS), is caused by Old World hantaviruses found in Europe, Africa, and Asia, impacting around 150,000 people annually with a mortality rate between 1% and 15%.
Recognizing the Symptoms
Symptoms of Hantavirus Pulmonary Syndrome (HPS) typically emerge between one and eight weeks post-exposure, initially presenting as flu-like conditions such as fatigue, fever, and muscle aches. As the illness progresses, individuals may experience significant respiratory distress, including shortness of breath and chest tightness, as fluid accumulates in the lungs. The US Centers for Disease Control and Prevention estimates that approximately 38% of individuals who develop these respiratory complications may succumb to the disease. For Haemorrhagic Fever with Renal Syndrome (HFRS), symptoms appear within one to six weeks after exposure to infected rodents. Early signs include a sudden onset of fever, intense headaches, and nausea. The disease progresses through distinct phases, with an increasing risk of low blood pressure, kidney failure, and internal bleeding.
Treatment and Prevention
Currently, there is no specific cure or antiviral treatment for Hantavirus Pulmonary Syndrome (HPS). Prompt diagnosis and supportive care are critical. While some antiviral medications may help manage symptoms, patients with severe respiratory issues often require intensive support, such as mechanical ventilation. Dialysis may also be necessary for individuals experiencing kidney complications. To mitigate the risk of hantavirus infection in areas where it is prevalent, it is crucial to avoid direct contact with rodent urine, droppings, and nesting materials. Thorough cleaning of areas frequented by rodents is recommended. The World Health Organization has advised passengers and crew on the MV Hondius to maintain rigorous hand hygiene, stay alert for hantavirus symptoms, and self-monitor for 45 days. Environmental cleaning, adequate ventilation on the ship, and prompt isolation of symptomatic individuals with proper respiratory etiquette, including masking, are also important precautions.
Distinguishing from Covid-19
While both hantavirus and Covid-19 are infectious diseases, they have distinct origins and transmission routes. Hantaviruses are zoonotic, meaning they are transmitted from animals (rodents) to humans, and are not generally known to spread between people, with a few exceptions. In contrast, Covid-19 is a respiratory pandemic caused by the SARS-CoV-2 virus, which spreads easily from person to person through respiratory droplets. Covid-19 also has a much shorter incubation period, typically ranging from two days to two weeks. Although Covid-19 has had a devastating global impact, its mortality rate of 1-2% is significantly lower than that of hantaviruses, particularly HPS, which has a mortality rate as high as 40%. Covid-19 primarily affects the respiratory system but can lead to multi-organ failure in severe cases.
