Hantavirus, a disease transmitted by rodents, is believed to have caused a fatal incident on a luxurious cruise ship. Approximately 150 individuals, including four Canadians, remained stranded on the vessel anchored off West Africa after three deaths and multiple illnesses were reported. The World Health Organization (WHO) disclosed that investigations are ongoing regarding the outbreak on the cruise ship, with detailed examinations, laboratory tests, and epidemiological studies being conducted.
The genetic sequencing of the virus is also underway to determine its specific strain, aiding in predicting symptoms and understanding the transmission pattern. Notably, last year, musician Betsy Arakawa, the spouse of the late actor Gene Hackman, succumbed to a hantavirus infection in New Mexico.
Hantavirus, commonly spread by rodents and rarely by humans, has been reported in various parts of the world. Several hantaviruses are linked to rodents such as rats and mice. In North America, five rodent species carry hantaviruses, with three commonly found in Canada. The disease has been documented for centuries, causing outbreaks in Asia and Europe, and emerged as a respiratory illness in the southwestern United States in the early 1990s.
The transmission of hantavirus primarily occurs through contact with rodents or their excretions, especially when disturbed, leading to airborne exposure. Although rodents carrying the virus may not show symptoms, humans can contract the virus through close contact, particularly in enclosed spaces with poor ventilation or areas with rodent droppings.
While human-to-human transmission of hantavirus is rare, instances have been reported with certain virus strains. The Andes virus, found in the Americas, has been associated with direct transmission between individuals, usually during the early stages of illness when the virus is highly contagious.
Symptoms of hantavirus infection typically manifest one to eight weeks post-exposure, ranging from fatigue, fever, and muscle pain to respiratory difficulties. The disease can be challenging to distinguish from the flu in its initial stages. Treatment for hantavirus infection involves supportive care in intensive care units to manage symptoms and provide respiratory support.
Hantavirus infections have reported fatality rates ranging from 20 to 50%, varying by virus strain. In British Columbia, the fatality rate is approximately 44%, while the U.S. Centers for Disease Control and Prevention recorded an overall fatality rate of 36%. Hemorrhagic fever with renal syndrome, another hantavirus-related illness, has a death rate ranging between one to 15%.
Prevention of hantavirus infections involves avoiding contact with rodents and their excretions, especially during spring and early summer when deer mice activity peaks. Proper cleaning practices, such as using bleach solutions and avoiding sweeping or vacuuming rodent waste, are crucial in reducing the risk of virus transmission. Regular airing out of enclosed spaces and wearing protective gear during cleaning can help prevent hantavirus infections.