June was a bad month for Dallas County's lone public hospital. After all the patients were treated and the bills were added up, Parkland Memorial Hospital had a net loss of $5.3 million, its board of managers was told Wednesday. Officials blamed the overrun on a surge in charity care and fewer births. The hospital's 805 births in June were 4 percent fewer than expected. Most are covered by Medicaid, an important source of Parkland's income. The hospital also saw a drop in private-paying patients. That caused a $1.7 million revenue decline, said interim chief financial officer Ted Shaw.