WORCESTER — Mayor Joseph M. Petty said Thursday that spring is a time of celebration and renewal, and said the increasing supply of COVID-19 vaccinations is giving people some sense of seeing light at the end of the tunnel. But he cautioned that "we're not quite there yet," and the city's virus and vaccination numbers this week reflected a mix of unease and optimism. At Thursday's weekly briefing at City Hall, City Manager Edward M. Augustus Jr. confirmed another 359 cases of the virus for a total of 22,370 since the start of the pandemic. Augustus said that represents an increase of 48 cases over last week's numbers, adding that he hopes it's a "blip and not a trend."