Overly inflammatory headlines aside (no strong evidence for this age-specific spread I believe) - this is some very bad luck to now have B.1.617.2 (Delta, a VOC) on top of B.1.617.1 (Kappa, a VUI) get out of hotel quarantine & into the community at the same time.
https://twitter.com/couriermail/status/1400629065128632322
VOC - VIU info: who.int/en/activities/…
Other sites in Australia have hosted Delta variant infected people including NSW, VIC, QLD, WA and the NT 
05JUN2021 Prof Sharon Lewin noting that ~20-30% of cases in Quaraneitne can't be sequenced for technical reasons (presumably low viral load at time of sampling, or poor specimen quality). So could have been a case in VIC HQ that just wasn't able to be identified using sequencing
Also, notes no real evidence for better transmission among children (even from best, UK-based data) - just anecdote.
No exact match to any other B.1.617s sequenced in Aus (some submit sequences to GISAID first then to AusTrakka - which has limited access compared to GISAID [all seem to submit to GISAID eventually though])
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