The World Health Organisation has retracted its claim that the spread of Covid-19 by an asymptomatic person seems rare. The claim was made by technical lead Maria Van Kerkhove at a WHO press briefing on Monday and faced widespread criticism by experts and scientists. WHO organised a live question and answer session on Tuesday, to clarify. Kerkhove said that she was responding to a question and was just trying to articulate what they know. She added that she was just referring to a very small subset of studies and that's why she used the phrase 'very rare'. While asymptomatic transmission does occur, no one knows for sure how frequently it happens and it remains an open question.