Main criticism of WHO

• Airborne-virus experts, including Don Milton and colleagues in a BMJ opinion piece, are calling on WHO to change its default approach for emerging respiratory-risk outbreaks by strengthening airborne precautions rather than waiting for definitive proof .
• The criticism is that WHO’s public line emphasizes “low” or “minimal” public risk and close-contact spread, while scientists argue uncertainty should trigger precautionary measures because the consequences of missed transmission chains could be severe .
• Researchers also note that a hantavirus outbreak on a cruise ship is unprecedented and raises unresolved questions about where and how passengers were infected .

Evidence that airborne transmission may be a serious risk

• Hantaviruses are commonly acquired by inhaling aerosolized virus from rodent urine, droppings, or saliva, so inhalation is already central to hantavirus biology .
• Andes virus is exceptional among hantaviruses because person-to-person transmission has been documented, although it is considered rare .

WHO public messaging vs. operational guidance

• WHO’s public messaging has stressed that global public-health risk is low and that risk to passengers and crew is moderate .
• WHO-linked public remarks also described the general-public risk as “absolutely low” or minimal, with spread framed as requiring very close contact .
• At the same time, WHO’s outbreak toolbox includes operational material for disembarkation and onward management of passengers and crew, and ECDC’s aligned rapid advice calls for infection-prevention controls such as masking, distancing, PPE for healthcare and cleaning workers, contact tracing, and risk communication .

Precautionary measures being urged

• Scientists and public-health guidance are urging respiratory protection, especially high-quality masks or respirators for healthcare workers, first responders, cleaning staff, symptomatic people, and close contacts .

Current status and public-health significance

• The most recent summaries report about 11 cases and three deaths linked to the cruise-ship outbreak, with most confirmed cases identified as Andes virus .
• WHO has said there is no sign of a larger outbreak so far, while also acknowledging that more cases could emerge because of incubation timing .

Main criticism of WHO

• Airborne-virus experts, including Don Milton and colleagues in a BMJ opinion piece, are calling on WHO to change its default approach for emerging respiratory-risk outbreaks by strengthening airborne precautions rather than waiting for definitive proof .
• The criticism is that WHO’s public line emphasizes “low” or “minimal” public risk and close-contact spread, while scientists argue uncertainty should trigger precautionary measures because the consequences of missed transmission chains could be severe .
• Researchers also note that a hantavirus outbreak on a cruise ship is unprecedented and raises unresolved questions about where and how passengers were infected .

Evidence that airborne transmission may be a serious risk

• Hantaviruses are commonly acquired by inhaling aerosolized virus from rodent urine, droppings, or saliva, so inhalation is already central to hantavirus biology .
• Andes virus is exceptional among hantaviruses because person-to-person transmission has been documented, although it is considered rare .

WHO public messaging vs. operational guidance

• WHO’s public messaging has stressed that global public-health risk is low and that risk to passengers and crew is moderate .
• WHO-linked public remarks also described the general-public risk as “absolutely low” or minimal, with spread framed as requiring very close contact .
• At the same time, WHO’s outbreak toolbox includes operational material for disembarkation and onward management of passengers and crew, and ECDC’s aligned rapid advice calls for infection-prevention controls such as masking, distancing, PPE for healthcare and cleaning workers, contact tracing, and risk communication .

Precautionary measures being urged

• Scientists and public-health guidance are urging respiratory protection, especially high-quality masks or respirators for healthcare workers, first responders, cleaning staff, symptomatic people, and close contacts .

Current status and public-health significance

• The most recent summaries report about 11 cases and three deaths linked to the cruise-ship outbreak, with most confirmed cases identified as Andes virus .
• WHO has said there is no sign of a larger outbreak so far, while also acknowledging that more cases could emerge because of incubation timing .