The delta variant is causing what public health officials are calling the beginning of a third wave of COVID-19 infections both locally and across the country. And San Joaquin County will likely not be immune if local vaccination rates do not increase. San Joaquin County Public Health Officer Dr. Maggie Park said recent numbers show that the state could be entering a surge of coronavirus infections as bad as what was seen last summer when case rates in the county were more than six times what they are now. At a county Board of Supervisors meeting this week, Park described recent increases in infection rates as "a little bit concerning," calling increases being seen across the country as "alarming."