https://www.scientificamerican.com/article/coronavirus-news-roundup-january-9-january-15/

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Vaccine (and masking) lessons can be drawn from the reported SARS-CoV-2 infections among three members of Congress who sheltered in a crowded room among unmasked colleagues during the Jan. 6 storming of the U.S. Capitol, writes Ben Guarino at The Washington Post (1/13/21). All 3 representatives had received just one of their two-dose shots against the virus — one member received it on Dec. 29 while the other two received it on Jan. 4, Guarino reports. The two vaccines being administered in the U.S. require two doses to confer their full protection. “Early protection against COVID-19 may occur from about 12 days after dose one,” a Johns Hopkins Bloomberg School of Public Health physician and epidemiologist is quoted as saying. People “should not really consider themselves protected until after a week or two following dose two,” he adds.