Massachusetts public health officials reported 2,232 new COVID-19 breakthrough cases in fully-vaccinated people in the past week, data from the Department of Public Health shows.A breakthrough case is when an individual tests positive for COVID-19 after they've been fully vaccinated against the disease.Numbers from the Massachusetts Department of Public Health show there have been 9,969 cases of COVID-19 in fully-vaccinated individuals as of Aug. 7. Last week, the DPH reported 7,737 total breakthrough cases of of July 31. The 9,969 positive COVID-19 cases are among the 4.39 million residents considered fully vaccinated in Massachusetts, or just over 0.2% of those individuals. The state health department said 445 of those 9,969 cases resulted in hospitalization and 106 cases resulted in death based on information reported to date.Last month, the DPH confirmed genetic sequencing of initial samples associated with the Fourth of July weekend COVID-19 cluster in Provincetown tested positive for the delta variant.Massachusetts hospitals have seen a surge in hospitalizations since the Fourth of July, with the number of COVID-19 patients more than quadrupling, from a low of 80 on July 4 to 334 as of Tuesday.The seven-day average of hospitalizations has increased from a low of 85 on July 9 to its current mark of 278.