According to the results of the genomic surveillance of the SARS-CoV-2 virus, as of December 27, 2021, a total of 87 confirmed cases of infection with the SARS-CoV-2 virus carrying the Omicron strain (B.1.1.529) have been diagnosed.
These cases do not reflect the actual number of Omicron cases in the community, but only a number of suspected cases to be confirmed, along with a number of cases investigated by random sampling of cases diagnosed in the Mobile Health Teams (CMOs).
It is noted that the percentage of Omicron strain shows a strong upward trend in the territory.
At the same time, in the Central Laboratory of Public Health (KEDY) as well as in other regional laboratories, a test is performed for possible Omicron samples with the real-time PCR method that can separate Omicron samples from the other executives with great reliability.
In this context, 728 positive samples for SARS-CoV-2 were tested weekly from 12/20/2021 to 12/27/2021. Out of the 728 positive samples, 198 were found positive in Omicron (27.2%) with the percentages per day ranging between 19% and 39%.
Out of the 728 samples, 181 and 197 samples concerned cases from the mass anonymous sampling outside Attica and in Attica, respectively, carried out by the KOMY of EODY during the week from 20/12/2021 to 27/12/2021.
Specifically, in the mass anonymous sampling carried out this week, in the region of Attica, 42.1% (83/197) of the positive PCRs related to Omicron cases, with the percentages per day ranging between 28% and 66%, while in the region only 7.7% (14/181) of the positive PCRs were Omicron cases, with rates per day ranging between 3% and 13%.
Finally, in terms of targeted sampling performed in individuals who had close contact with a confirmed case of Omicron mutation, only 7.6% (89/1178) of the positive PCRs were Omicron cases, with rates per day ranging between 2.7 % and 12.5%.
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