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American soldiers line up to receive the first COVID-19 vaccines at the Brian D. Allgood Army Community Hospital, U.S. Army Garrison Humphreys, in Pyeongtaek, South Korea, on Tuesday. Photo: United States Forces Korea via Getty Images

World Health Organization chief scientist Soumya Swaminathan told a virtual briefing Monday people who've been vaccinated for COVID-19 "need to take the same precautions" as those who haven't "till there's a certain level of herd immunity."

Driving the news: Swaminathan was asked whether international travel without quarantine would be possible after mass coronavirus vaccinations. "I don't believe we have the evidence on any of the vaccines to be confident that it's going to prevent people from actually getting the infection and therefore being able to pass it on," she said.

  • WHO Health Emergencies director Mike Ryan noted "there's no guarantee of eliminating or eradicating an infectious disease" — even with a vaccine that has high efficacy as the ones being rolled out are.
  • "That is a very high bar for us to be able to get over," he said.

Why it matters: Many tourism-reliant countries, along with the travel and tourism industry, are hopeful that coronavirus vaccinations will see global travel start to make a comeback next year, with international borders reopening.

  • The airline industry has developed mobile apps that would receive coronavirus test and vaccination certificates — though Axios' Joann Muller reports that COVID-19 tests will be the passport to travel in 2021

The big questions: In addition to the uncertainty on whether vaccines will stop transmission of the virus or just prevent people from becoming sick, it's still unknown how long immunity through vaccination lasts, per Axios' Alison Snyder, Eileen Drage O'Reilly.

  • It's also unknown whether people can have rare or delayed side effects, which could be detected in long-term trials with millions of participants.

By the numbers: COVID-19 has killed nearly 335,000 people and infected over 19.3 million in the U.S., per Johns Hopkins.

  • Globally, almost 1.8 million people have lost their lives to the virus and nearly 81.3 million have tested positive.

Worth noting: Ryan said "the likely scenario" for the virus once brought under control is that it will "become another endemic virus that will remain somewhat of a threat, but a very low level threat in the context of an effective global vaccination program."

Go deeper: Coronavirus won't disappear, even with a vaccine

Go deeper

L.A. becomes first county to surpass 1 million coronavirus cases

COVID-19 mass-vaccination of healthcare workers takes place at Dodger Stadium. Photo: Irfan Khan/Los Angeles Times via Getty Images

Los Angeles County officials said Saturday they had detected the county's first case of the highly transmissible coronavirus variant first found in the United Kingdom.

Why it matters: The announcement came as L.A. became the first county to surpass 1 million COVID-19 cases, straining the area's already overwhelmed health care system.

Updated 27 mins ago - Politics & Policy

Coronavirus dashboard

Illustration: Annelise Capossela/Axios

  1. Health: CDC director defends agency's response to pandemic — CDC warns highly transmissible coronavirus variant could become dominant in U.S. in March.
  2. Politics: Biden readies massive shifts in policy for his first days in office.
  3. Vaccine: Fauci: 100 million doses in 100 days is "absolutely" doable.
  4. Economy: Unemployment filings explode again.
  5. Tech: Kids' screen time sees a big increase.
  6. World: WHO team arrives in China to investigate pandemic origins.
Dave Lawler, author of World
1 hour ago - World

Alexey Navalny detained after landing back in Moscow

Navalny during a march last February. Photo: Kirill Kudryavtsev/AFP via Getty

Russian opposition leader Alexey Navalny returned to Moscow on Sunday, five months after being poisoned with the nerve agent Novichok and despite being warned that he faced arrest upon his return.

The latest: Navalny was stopped at a customs checkpoint and led away alone by officers. He appeared to hug his wife goodbye, and his spokesman reports that his lawyer was not allowed to accompany him.