Understanding Hantavirus and Its Global Implications
Hantaviruses are a group of zoonotic viruses that naturally infect rodents such as rats and mice. These viruses can occasionally be transmitted to humans, causing severe illness and, in some cases, death. The disease is particularly concerning due to its potential for rapid progression and high fatality rates in certain regions. As global health authorities intensify surveillance over the spread of Hantavirus, concerns are growing about Nigeria’s vulnerability to the rodent-borne disease amid poor sanitation, overcrowded communities, weak public awareness, and health gaps.
Although no confirmed case has been officially recorded in Nigeria, the presence of rodents in homes, markets, and food storage areas could increase the risk of exposure if preventive measures are neglected. This situation has renewed conversations around Nigeria’s preparedness to detect and respond to emerging infectious diseases before they escalate into a public health emergency. Especially with recent global discussions about Hantavirus, anxieties among Nigerians have risen, given the country’s ongoing challenges with recurring disease outbreaks, poor sanitation, and worsening living conditions.
Transmission and Symptoms of Hantavirus
Hantaviruses belong to the family Hantaviridae within the order Bunyavirales. Each virus is often associated with a specific rodent reservoir species, where the virus causes long-term infection without apparent illness. While many Hantavirus species have been identified worldwide, only a limited number are known to cause human disease.
The transmission of Hantaviruses to humans can occur through contact with contaminated urine, droppings, or saliva of infected rodents. Although infection through rodent bites is uncommon, activities involving contact with rodents, such as cleaning enclosed or poorly ventilated spaces, farming, forestry work, and sleeping in rodent-infested places, increase the risk of infection.
Infection in people can result in severe illness and often death, depending on the type of virus and geographical location. The two main syndromes caused by Hantaviruses are:
- Hantavirus Cardiopulmonary Syndrome (HPS): Found mainly in the Western Hemisphere, including the United States.
- Haemorrhagic Fever with Renal Syndrome (HFRS): More common in Europe and Asia.
Symptoms of HPS usually begin to show between one and eight weeks after contact with an infected rodent. Early symptoms may include fatigue, fever, and muscle aches, especially in the large muscle groups like the thighs, hips, back, and sometimes shoulders. Some patients also experience headache, dizziness, chills, and abdominal problems such as nausea, vomiting, diarrhoea, and pain. In severe cases, patients may experience tightness in the chest as the lungs fill with fluid.
On the other hand, symptoms of HFRS typically develop within one to two weeks of exposure and sometimes later. They include acute fever, severe headache, blurred vision, and nausea. Severe forms, such as those involving the Dobrava virus or Hantaan virus, can result in internal bleeding and kidney failure.
Historical Context and Recent Outbreaks
The virus was first detected during the Korean War after thousands of United Nations soldiers fighting in Korea developed a mysterious illness involving high fever, bleeding, and kidney failure. Scientists later traced it to rodents near the Hantan River, from which the name “Hantavirus” was derived.
In May 2026, the World Health Organisation (WHO) received a report of a cluster of passengers with severe respiratory illness aboard the cruise ship, MV Hondius, which had 147 passengers and crew members. As of May 8, eight cases, including three deaths, had been reported, with six cases confirmed as Hantavirus infection. On May 14, the Director-General of the WHO, Tedros Adhanom Ghebreyesus, disclosed that more than 120 passengers from 23 countries safely disembarked from the vessel in Tenerife and were being monitored by public health authorities in their home countries after weeks of quarantine and containment efforts.
Tedros highlighted the importance of preparedness, surveillance, and international cooperation in responding to infectious disease threats. He also stressed that the operation underscored the need for vigilance and proactive measures to prevent future outbreaks.
Prevention and Public Health Measures
Despite the lower incidence of Hantavirus infections globally, the disease remains a major public health concern due to its high case fatality rate. For instance, in the Americas, Hantavirus cardiopulmonary syndrome (HCPS) has a fatality rate commonly between 20 and 40 per cent. In Asia and Europe, the case fatality rate ranges from less than one per cent to 15 per cent.
In many Nigerian cities where rats have become a constant problem in homes, markets, and drainage systems, fear surrounding the virus reflects deeper concerns about the country’s fragile public health and sanitation systems. Recently, the Nigeria Centre for Disease Control and Prevention intensified disease surveillance across the country following reports of an international Hantavirus cluster linked to the cruise ship.
In a public health advisory, the Director-General of the agency, Dr Jide Idris, said there was no confirmed case of Hantavirus in Nigeria. He emphasized the need for vigilance and urged Nigerians to observe preventive measures, such as reducing contact with rodents, maintaining clean surroundings, preventing rodent infestation, properly storing food items, and disposing of waste safely.
Public health experts, including Prof Tanimola Akande and Dr Idris Bayonle, have also stressed the importance of environmental hygiene and rodent control. They recommended sealing entry points into buildings, ensuring proper disposal of domestic waste, and keeping food items in properly covered containers to limit contact between rodents and humans.
Dr Bayonle warned against panic and misinformation, urging the National Orientation Agency to embark on massive public health sensitisation campaigns. He noted that while there is no need for panic, Nigerians must avoid misinformation and rely on verified scientific information. Agencies like the National Orientation Agency should intensify awareness campaigns on preventive measures and environmental hygiene.
Conclusion
Hantavirus remains a significant public health threat, particularly in regions with poor sanitation and high rodent populations. While Nigeria has not yet recorded any confirmed cases, the potential risk highlights the need for continuous vigilance, improved sanitation, and robust public health measures. By focusing on prevention, education, and international collaboration, countries can better prepare for and respond to emerging infectious diseases like Hantavirus.
