Sweetgreen’s same-store sales were moving in the right direction during the second quarter, thanks in part to the new wraps introduced earlier this year. Same-store sales were down 6.2% in the June 28-ended quarter. And Sweetgreen’s negative transactions improved sequentially through the second quarter, down 3% in April and May but ending up flat in June, the company said. A cyclospora outbreak has put explosive diarrhea in the headlines and is believed to be tied to iceberg lettuce — though the exact source remains unclear. Sweetgreen’s revenue in the second quarter increased 3.8% to $192.7 million, mostly attributed to restaurant growth.