Christine Loscher, a professor of immunology at the DCU, said there are two to three times as many positive cases as with PCR and antigen tests.
He said the pattern was that the subvariants appeared every three months.
She said Ireland will be moving from the BA.4 and BA.5 variants, but it’s unclear whether the next variant will be smooth or not.
Professor Loscher added that there were many unknowns but a decision on vaccine strategy was a priority.
The number of people with Covid-19 in intensive care is 36.
The total number of people hospitalized with Covid-19 has fallen to 903 people.
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