The four were among those who endured the wrath of the crowd — supporters of Donald Trump aiming to prevent the certification of Joe Biden's election win.
With only about 57 per cent of eligible U.S. residents fully vaccinated, media reports say the Biden administration plans to keep its borders closed for now.
Cohen, a lawyer, lobbyist and fundraiser who currently serves as a senior adviser to the head of U.S. communications giant Comcast, had long been pegged as the likely nominee.
The report states: "Lambda has been associated with substantive rates of community transmission in multiple countries, with rising prevalence over time concurrent with increased Covid-19 incidence."
The couple — and millions of other people vaccinated through a U.N.-backed effort — could find themselves barred from entering many European and other countries because those nations don't recognize the Indian-made version of the vaccine for travel.