Doctors have uncovered an unsettling twist in how long dangerous viruses can linger in the body: the hantavirus can remain in human semen for almost six years after someone first falls ill. This finding is a major wake-up call for public health, suggesting the virus might still be sexually transmissible long after a person appears fully recovered.
This revelation reshapes assumptions about how long viruses can hide in the male reproductive system. Scientists are now re-evaluating post-recovery protocols to prevent secondary outbreaks, similar to those seen with other long-lasting pathogens.
Researchers at the Spiez Laboratory, a Swiss government facility combating biological threats, published their findings in Viruses. The researchers looked closely at the case of a 55-year-old man from Switzerland who caught the Andes strain of the hantavirus while traveling in South America.
At first glance, he seemed fully cured, as tests showed no sign of the bug in his blood, urine, or lungs. But when doctors ran more specific tests, they still found the virus in his semen a full 71 months after his original infection.
Finding the virus after such a massive delay means doctors might need to rethink how long patients actually need to take precautions. It really highlights a hidden risk that normal health screenings can easily miss.
To do their job properly, human sperm cells actually need a built-in shield from the body's own immune system to make sure reproduction works. This biological shield inadvertently creates an environment where viruses survive undetected for extended periods.
According to the paper, the male testes serve as a biological 'reservoir', allowing the virus to essentially 'hide'. The testes are known to provide a 'safe harbour' for at least 27 infectious diseases.
Health officials draw parallels to the 2021 Ebola outbreak in Guinea, causing 23 cases and 12 fatalities. Investigators linked that outbreak to a survivor of the 2014–2016 epidemic who transmitted the virus sexually years later.
Addressing this exact threat, the 2023 study authors issued a clear warning. 'Taken together, our results show that the Andes virus has the potential for sexual transmission,' the researchers stated.
The discovery carries immediate implications for eight confirmed hantavirus cases tied to theMV Hondiuscruise ship. Furthermore, at least 20 asymptomatic individuals are isolating in Britain under observation.
Source: International Business Times UK
