Although human-to-human transmission of the rodent-borne hantavirus is rare, a deadly outbreak occurred on a cruise ship in the Atlantic Ocean, prompting global health officials, including those in Canada, to monitor for potential spread. Contact tracing is being conducted for individuals who had close and prolonged contact with infected passengers from the MV Hondius, which departed Argentina on April 1. Upon docking at St. Helena on April 24, 32 passengers and one crew member left the ship and have since traveled to various countries. Health officials are now working to locate and test these individuals for potential exposure.
The World Health Organization (WHO) confirmed that the outbreak is linked to the Andes strain of hantavirus, endemic to Argentina and the only strain known to spread among humans. With a potentially lengthy incubation period of up to six weeks, more cases may surface, according to WHO Director-General Dr. Tedros Adhanom Ghebreyesus.
Contact tracing, a method familiar from the COVID-19 pandemic, plays a crucial role in tracking and containing the hantavirus spread. This process involves identifying, informing, and monitoring individuals who may have been exposed to the virus, especially those in close proximity to infected persons.
Dr. Alfredo Mena Lora, an infectious diseases specialist, highlighted the challenges of contact tracing in modern travel settings due to the ease and volume of movement among individuals. The unique characteristics of hantavirus, including its long incubation period, further complicate the tracing process.
Unlike COVID-19, hantavirus is not as easily transmissible through air and necessitates contact tracing similar to diseases such as tuberculosis and measles, which spread through prolonged and close contact. While there is no specific treatment or vaccine for hantavirus, contact tracing aids in identifying individuals at risk of infection.
As the outbreak unfolds, confirmed cases of hantavirus among MV Hondius passengers, including fatalities, are being reported. Several passengers from various countries are being monitored, with suspected cases and isolated individuals in different locations undergoing testing and observation.
Efforts are underway to trace contacts and isolate individuals at risk of exposure to prevent further spread of the hantavirus outbreak.