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(1/3) Study of 2 hairstylists with #COVID19. Both wore masks at work, as did clients. No cases were reported among their 139 clients (67 of whom tested negative). In contrast, all family contacts of one hairstylist tested positive. Good evidence for masks.
cdc.gov/mmwr/volumes/6…
(2/3) The study does have some limitations (as detailed in the paper), and it's possible some cases were missed. Nonetheless, it strongly suggests masks can help prevent transmission of #SARSCoV2. One hairstylist wore a cotton mask, the other a cotton mask or surgical mask.
(3/3) Of 104 interviewed clients, most wore a cotton mask (47%) or surgical mask (46%). Five wore a N95 respirator (5%). This suggests that cotton and surgical masks are effective when used by the general public, even though these types of masks do not offer complete protection.
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Dr Zoë Hyde
@DrZoeHyde
(1/4) Study of #SARSCoV2 antibody prevalence in a school community following an outbreak in Chile (the first cluster in the country). 10% of students and 17% of staff tested positive. Of these, 40% of students and 18% of staff were asymptomatic. #COVID19
academic.oup.com/cid/article/do…
(2/4) The index case(s) were thought to be adults in this cluster. The school year had only just begun and the school closed within 2 days of the first cases being detected, demonstrating that #SARSCoV2 can spread rapidly within the school environment.
(3/3) I would not be surprised if some false positives were observed here, and I suspect the correct proportion of asymptomatic cases may actually be a little lower. Nonetheless, it suggests that asymptomatic infections in children are substantial.
Read 5 tweets
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Dr Zoë Hyde
@DrZoeHyde
(1/18) A couple of people have drawn my attention to the guidance on school reopening recently released by The Hospital for Sick Children in Toronto.

I have some serious concerns about the document.
sickkids.ca/PDFs/About-Sic…
(2/18) I don't have time to perform a complete review, but I want to highlight some serious problems which cast doubt on the recommendations.
(3/18) First, the authors state that "evidence is mounting that children may be less susceptible to SARS-CoV-2 infection and may be less likely to transmit the virus to others."

They provide two references to support this statement.
Read 20 tweets
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Dr Zoë Hyde
@DrZoeHyde
(1/15) Updated thread on children and #COVID19, summarising recent studies.

Summary: both child-to-child and child-to-adult transmission has occurred; cases in children are being missed.
#edutwitter #Schulen #Kinder #kinderen
(2/15) First, a recap. Studies in this sub-thread show that children are probably as likely as adults to be infected given sufficient exposure, and can shed infectious virus.
(3/15) Children may have some protection compared to adults. They have less of the enzyme used by the novel coronavirus to enter cells. This might make them less susceptible, but given enough exposure this advantage is probably eventually lost.
Read 15 tweets

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