DS248:
DS248: ...
Part of the explanation for (supposedly) no imported cases in NZ in the month to 15 June is very likely lack of testing. Forty three of the 55 imported cases arriving in Hong Kong in the last month were asymptomatic at time of confirmation. Another factor also being that many imports to NZ will have come from AU, as has already been mentioned.
Recent data show that the majority (85/96) of asymptomatic confirmed cases transferred from the Diamond Princess to a hospital in Japan remained asymptomatic throughout the time they were quarantined in the hospital (Sakurai et al 2020, Letter to the Editor, NEJM 12 June).
Relevant point is that asymptomatic (/pre-symptomatic) arrivals should also be treated as potentially infected, not just people with 'covid-like' symptoms (many of whom may just have a cold or flu). Mind you, good to keep cold/flu quarantined also.
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In regard to concerns (speculation) that significant transmission is unlikely from true asymptomatic cases, this recent research potentially suggests otherwise?
https://www.nature.com/articles/s41591-020-0965-6
" ... The asymptomatic group had a significantly longer duration of viral shedding than the symptomatic group."
Precautionary principle would suggest treating such cases as potentially contagious until there is well founded research showing otherwise. Too much at stake to rely on speculation or 'gut feeling'.
Plus of course, will not initially be able to differentiate asymptomatic vs pre-symptomatic cases, and there is clear evidence of pre-symptomatic transmission.
Yep. This week had caused a big catchup on testing, that can only do good



