Not as concerning as it sounds: More vaccinated people getting infected in California FacebookTwitterEmail 1of2 Ezekiel Logan, a 96-year-old World War II veteran, receives his first dose of the Pfizer vaccine at the Moscone Center mass vaccination clinic in San Francisco, Calif. Thursday, February 4, 2021.Jessica Christian/The ChronicleShow MoreShow Less 2of2 Sarah Feldstein of San Francisco was fully vaccinated when she developed cold symptoms in early June and then tested positive for the coronavirus.Lea Suzuki/The ChronicleShow MoreShow Less As COVID-19 cases climb across California, so-called breakthrough infections among people who are fully vaccinated also are increasing, raising concerns that the highly contagious delta variant — now the dominant strain — may be better able than other strains to evade vaccines.