KEY POINTS
  • Government responses should focus on detecting and isolating infected people with symptoms, the World Health Organization said.
  • Preliminary evidence from the earliest outbreaks indicated the virus could spread even if people didn't have symptoms.
  • But the WHO says that while asymptomatic spread can occur, it is "very rare."

World Health Organization officials on Tuesday walked back the comments below that were made on Monday after drawing criticism from epidemiologists across the world. Dr. Maria Van Kerkhove, head of the WHO's emerging diseases and zoonosis unit, said Tuesday that asymptomatic spread is a "really complex question" and much is still unknown. "We don't actually have that answer yet," she said. 

"I was responding to a question at the press conference. I wasn't stating a policy of WHO or anything like that. I was just trying to articulate what we know," she said on a live Q&A streamed across multiple social media platforms. "And in that, I used the phrase 'very rare,' and I think that that's misunderstanding to state that asymptomatic transmission globally is very rare. I was referring to a small subset of studies."