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USA the source of most of New Zealand's coronavirus cases

The study also shows that most of the transmission lineages in NZ were from viral strains brought in from North America, which is probably a reflection of the high prevalence of the virus in that continent during the period when these cases occurred. However, the researchers did not find any sign of the virus in NZ before February 26. The study also shows that case detection is most efficient in the second half of the epidemic than in the earlier part, because the detection lag dipped as the age of transmission lineages went down. In other words, fewer cases went undetected as the time from the first inferred transmission event in each cluster to the first detected case dropped.

News Medical - August 10, 2020

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