The leading U.S. infectious disease specialist, Dr. Anthony Fauci, said on Wednesday he foresees America achieving enough collective COVID-19 immunity through vaccinations to regain “some semblance of normality” by autumn 2021, despite early setbacks in the vaccine rollout, - Reuters reports.

Fauci made his remarks during an online discussion of the pandemic with California Governor Gavin Newsom, who announced at the outset that a more infectious coronavirus variant originally found in Britain has been detected in his state, a day after the first known U.S. case was documented in Colorado.

Newsom said the coronavirus variant B.1.1.7 had been confirmed earlier in the day in a Southern California patient. He did not provide further details. But the California Department of Public Health said in statement later that the person, a San Diego County patient, has no known travel history, suggesting the variant is spreading within the community.

Fauci said he was “not surprised,” adding that additional cases of the variant would likely surface around the country and that the mutating nature of such viruses is normal.

“It appears that this particular mutation does make the virus better at transmitting from one person to another,” he said. However, individuals infected with earlier forms of SARS-CoV-2 “don’t seem to get re-infected by this,” meaning that any immunity already acquired “is protective against this particular strain,” Fauci added.

He also stressed that the so-called UK variant is believed to be no more severe in the illness it causes, and that newly approved COVID-19 vaccines will prove just as effective against it as against earlier known forms of the virus.

The same is believed to be true for a second new variant, also more infectious and first reported in South Africa, according to the U.S. Centers for Disease Control and Prevention (CDC).

Still, the emergence of a more highly transmissible variant could make a swift rollout of immunizations all the more critical.

President-elect Joe Biden warned on Tuesday it could take years to inoculate most Americans given an initial vaccine distribution rate that has lagged behind the promises of the Trump administration. He called on Congress to approve greater funding for the endeavor.