🇺🇦 Meaghan Kall. (2022, January 27). NEW: 🏴󠁧󠁢󠁥󠁮󠁧󠁿 Vaccine effectiveness (symptomatic infection) data for BA.2 {Omicron’s more infectious sister} NO difference in VE between Omicron (BA.1) and BA.2 Possibly even higher VE for BA.2 but estimates overlap See full thread 🧵 from @freja_kirsebom https://t.co/bJ7uCn2cGV [Tweet]. @kallmemeg. https://twitter.com/kallmemeg/status/1486821549458001927

Freja Kirsebom. (2022, January 28). Two important updates from our team this week: - Vaccine effectiveness (VE) against symptomatic disease after Omicron BA.2 shows that VE remains unchanged—VE against death after Omicron BA.1 shows VE is 95% at 2+ weeks after booster 1/7 Full report https://assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/1050721/Vaccine-surveillance-report-week-4.pdf [Tweet]. @freja_kirsebom. https://twitter.com/freja_kirsebom/status/1486730977464369160

Tom Wenseleers. (2022, January 23). @HarrySpoelstra @trvrb @CorneliusRoemer @JosetteSchoenma BA.2 has a growth rate advantage over BA.1 of ca 0.11/day. That’s quite sizeable. If it would have the same short generation time as BA.1 of 2.2 days it would imply a ca.1.3x higher transmissibility, due to higher contagiousness or immune escape. Https://t.co/X8TcWJ4pXQ [Tweet]. @TWenseleers. https://twitter.com/TWenseleers/status/1485375883066101763

ReconfigBehSci. (2022, February 18). RT @chrischirp: Speaking of which, latest COG UK data shows that BA.2 is dominant already in NI & likely dominant within Scotland & Eng wit… [Tweet]. @SciBeh. https://twitter.com/SciBeh/status/1494711071839592450

ReconfigBehSci. (2022, January 28). RT @chrischirp: BA.2 & BA.1.1 (Omicron variants) are growing in many countries. Quite what this means in terms of cases, hospitalisation… [Tweet]. @SciBeh. https://twitter.com/SciBeh/status/1487066966363934720

Prof Peter Hotez MD PhD. (2022, February 7). 1: BA.2 some evidence that it’s even more transmissible than the original omicron which is more transmissible than delta, and so forth. If it takes hold like it did in Denmark it will slow the descent of original omicron here [Tweet]. @PeterHotez. https://twitter.com/PeterHotez/status/1490669166176702466

ReconfigBehSci. (2022, March 8). RT @PeterHotez: Two US COVID trends I’m following: 1) Make sure the decline in new cases continues, 2) Screenshot from http://Outbreak.Info… [Tweet]. @SciBeh. https://twitter.com/SciBeh/status/1501193920058961924

ReconfigBehSci. (2022, March 18). RT @KamranAbbasi: The rapid rise in cases of Omicron BA.2 only underlines that airborne transmission is real and dominant. This is a respir… [Tweet]. @SciBeh. https://twitter.com/SciBeh/status/1505207686169862147

ReconfigBehSci. (2022, March 8). RT @DrEricDing: ⚠️UPDATE—#BA2 is now 11.6% in US, up from 8.3% last week. It’s definitely increasing, as warned. #COVID19 still dropping, b… [Tweet]. @SciBeh. https://twitter.com/SciBeh/status/1501248333876240385

ReconfigBehSci. (2022, January 31). RT @fascinatorfun: Interesting as 🇩🇰 Omicron BA2 wave started sooner than 🇬🇧 “We conclude that Omicron BA.2 is inherently substantially m… [Tweet]. @SciBeh. https://twitter.com/SciBeh/status/1488152457012297736

ReconfigBehSci. (2022, March 19). RT @Kit_Yates_Maths: I know this tweet is aimed at the US, but it would be great if the message about BA.2 would sink in in the UK too! [Tweet]. @SciBeh. https://twitter.com/SciBeh/status/1505210192287481857

John Roberts. (2022, January 28). Some (very) early evidence that secondary attack rates of BA.2 are higher in household settings than those of its older sibling. From the latest Variant TB 35. Https://assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/1050999/Technical-Briefing-35-28January2022.pdf 1/ https://t.co/AFTril1jF1 [Tweet]. @john_actuary. https://twitter.com/john_actuary/status/1487086733149749251

Alastair Grant. (2022, March 9). Based on the spike gene target data from TaqPath, BA.2 made up 82% of COVID cases in England on 6th March—It has now almost taken over We know that BA.2 has higher transmission than Omicron and there are a number of examples from Denmark of BA.2 reinfection shortly after BA.1 https://t.co/rEyud8osY1 [Tweet]. @AlastairGrant4. https://twitter.com/AlastairGrant4/status/1501606060033028099

ReconfigBehSci. (2022, January 23). RT @LauraMiers: BA.2’s growth advantage over BA.1 is jarring. Meanwhile, we are operating under the assumption that “Omicron will end the p… [Tweet]. @SciBeh. https://twitter.com/SciBeh/status/1485519516914302980

Prof Peter Hotez MD PhD. (2022, February 8). So it’s Groundhog Day for Covid, no BA.2 and we get an early Covid spring; if BA.2 accelerates we get 6 more weeks of Covid winter [Tweet]. @PeterHotez. https://twitter.com/PeterHotez/status/1491144988738322433

Al Newman. (2022, March 8). @danaparish @jennybluebird2U To your point: Https://t.co/CsULpIACoI [Tweet]. @AlNewman_. https://twitter.com/AlNewman_/status/1501056062262333441

Prof. Christina Pagel 🇺🇦. (2022, March 8). What could be causing it? Likely combo of: 1—Dominant BA.2 causing more infections (we await ONS!) 2—Reduction in masks, self-isolation & testing enabling more infections 3—Waning boosters in older people esp I worry that we will be stuck at high levels for long time. 2/2 https://t.co/xZ2SLFNVkS [Tweet]. @chrischirp. https://twitter.com/chrischirp/status/1501250081693048838

Eric Feigl-Ding. (2022, January 23). 6) here is BA2 in Netherlands 🇳🇱—Already at 5%. HT @LongDesertTrain https://t.co/AoE1jGto03 [Tweet]. @DrEricDing. https://twitter.com/DrEricDing/status/1485317793855778823

Eric Feigl-Ding on Twitter. (n.d.). Twitter. Retrieved 21 March 2022, from https://twitter.com/DrEricDing/status/1501778936942010370

Haseltine, W. A. (n.d.). Birth Of The Omicron Family: BA.1, BA.2, BA.3. Each As Different As Alpha Is From Delta. Forbes. Retrieved 30 March 2022, from https://www.forbes.com/sites/williamhaseltine/2022/01/26/birth-of-the-omicron-family-ba1-ba2-ba3-each-as-different-as-alpha-is-from-delta/

CBC Podcasts. (2022, February 3). Today on #TheDoseCBC: a frank discussion about the new #Omicron sub-variant with virologist @angie_rasmussen, who says BA.2 isn’t necessarily more pathogenic—But we need to proceed with caution. Learn more: Http://bit.ly/3gnlPak https://t.co/NOp7MMwkwk [Tweet]. @cbcpodcasts. https://twitter.com/cbcpodcasts/status/1489315238822490118

Coronavirus infections remain high while Omicron ‘stealth variant’ rises—REACT | Imperial News | Imperial College London. (n.d.). Imperial News. Retrieved 22 March 2022, from https://www.imperial.ac.uk/news/234517/coronavirus-infections-remain-high-while-omicron/

Mahase, E. (2022). Covid-19: Is the UK heading for another omicron wave? BMJ, 376, o738. https://doi.org/10.1136/bmj.o738

ReconfigBehSci. (2022, March 11). RT @dgurdasani1: UKHSA tech report out—TL;DR: -BA.2 now represents >80% of omicron in England -Growth rate 80% greater relative to BA.1 p… [Tweet]. @SciBeh. https://twitter.com/SciBeh/status/1502598815081275393

ReconfigBehSci. (2022, March 6). RT @JPWeiland: BA.2 projections in the US: Coming off of the massive omicron wave (Rt=0.64) will provide a lot of immunity to restrict B… [Tweet]. @SciBeh. https://twitter.com/SciBeh/status/1500489703472222208

ReconfigBehSci. (2022, February 1). RT @thehowie: NYC update Cases down 40%; positive rate 4.0% Hospital census back to levels of December 27 and declining. New hospitali… [Tweet]. @SciBeh. https://twitter.com/SciBeh/status/1488786082254700553