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COVID-19 'breakthrough' cases with vaccinated people not unexpected
Washington confirms 'breakthrough' COVID-19 cases after vaccination
Why COVID-19 vaccines are working, despite 'breakthrough' cases
Tiny number of 'breakthrough' COVID cases, despite being fully vaccinated
Portland biology professor says number of breakthrough cases 'not at all surprising'
All you need to know about COVID-19 vaccine breakthrough infections
CDC reports breakthrough COVID cases, mostly in women
2 Nevadans with 'breakthrough' COVID-19 cases have died
Despite low numbers, St. Louis doctors closely studying 'breakthrough' infections following vaccine
'Breakthrough' cases of COVID-19 are expected, local health experts say
Mayo Clinic expert discusses breakthrough COVID-19 cases
Washington health official explains 'vaccine breakthrough' cases
