Two interesting papers on #omicron just out in @eurosurveillance:
One from Norway on THAT super spreading Christmas party in Oslo:
eurosurveillance.org/content/10.280…
One from Denmark on the first 785 #omicron cases there:
eurosurveillance.org/content/10.280…
One from Norway on THAT super spreading Christmas party in Oslo:
eurosurveillance.org/content/10.280…
One from Denmark on the first 785 #omicron cases there:
eurosurveillance.org/content/10.280…
Norway first:
117 people attended the party
99 had had two shots of mRNA vaccine (no-one boostered)
8 had recovered (unclear to me if they were vaccinated as well)
Everyone reported a negative rapid test before
117 people attended the party
99 had had two shots of mRNA vaccine (no-one boostered)
8 had recovered (unclear to me if they were vaccinated as well)
Everyone reported a negative rapid test before
81/110 (interviewed) people got Omicron, so the attack rate was a whopping 74%
As of December 13 "we detected nearly 70 other guests that were likely infected at the venue, and the Omicron variant
was detected in 53 of these through PCR variant
screening or sequencing"
As of December 13 "we detected nearly 70 other guests that were likely infected at the venue, and the Omicron variant
was detected in 53 of these through PCR variant
screening or sequencing"
"the high attack rate with symptomatic infection was likely exacerbated by the context and setting of the outbreak (indoor location, long exposure time, crowding, and the need to talk loudly)
Out of the 81 #omicron cases:
80 had symptoms
0 hospitalisations so far
“62 (78%) of the 80 symptomatic cases were still experiencing symptoms at the time of the interviews”
80 had symptoms
0 hospitalisations so far
“62 (78%) of the 80 symptomatic cases were still experiencing symptoms at the time of the interviews”
Remember:
"Some transmission may have occurred among colleagues in the workplace or at the pre-party as some of the attendees had symptoms prior to the party.”
"Some transmission may have occurred among colleagues in the workplace or at the pre-party as some of the attendees had symptoms prior to the party.”
But:
“our experience with this outbreak corroborates reports from other countries that the Omicron variant may be more transmissible and that vaccination may be less effective to prevent infection than for the Delta variant”
“our experience with this outbreak corroborates reports from other countries that the Omicron variant may be more transmissible and that vaccination may be less effective to prevent infection than for the Delta variant”
This strikes me as important:
"Assuming attendees were infected at the party, we observed a median incubation period of 3 days, which is short compared with previous reports for Delta and other previously circulating non-Delta SARS-CoV-2 (4.3 and 5.0 days, respectively)"
"Assuming attendees were infected at the party, we observed a median incubation period of 3 days, which is short compared with previous reports for Delta and other previously circulating non-Delta SARS-CoV-2 (4.3 and 5.0 days, respectively)"
Restrictions that Norway implemented in response include "restrictions of public and private events, such as reduction of group sizes, requirements for working from home and a ban on serving alcohol in restaurants and bars for an initial period of 4 weeks"
I’ll put up a separate thread on the Danish paper in a bit...
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