The Delta variant of the coronavirus is the cause of more than 80 percent of new U.S. Covid-19 cases, but the authorized vaccines remain more than 90 percent effective in preventing hospitalizations and deaths, said top U.S. infectious disease expert Anthony Fauci during a U.S. Senate hearing on July 20.

The next Covid pandemic could be prevented by using a gene drive to preemptively edit the genome of bats to prevent them from becoming hosts for coronaviruses, according to a proposal by scientists from Israel’s Interdisciplinary Center (IDC) Herzelia and the National Institutes of Health (NIH).

Health agencies and vaccine and immunology experts have pushed back against Pfizer and BioNTech’s assertions that a Covid-19 booster shot is necessary.

The Delta variant of the novel coronavirus that was first found in India is the greatest threat to the United States’ effort to eradicate Covid-19 in the country’s borders, said U.S. infectious disease expert Dr. Anthony Fauci during a press call.

Top U.S. infectious disease expert Dr. Anthony Fauci called on China to release the medical records of nine people whose ailments might provide vital clues into whether Covid-19 first emerged as the result of a lab leak, the Financial Times reported on June 3.

Kids in the United States will likely be able to get Covid-19 vaccinations by the end of 2021 or the first quarter of 2022, Dr. Anthony Fauci, the nation’s top infectious disease expert, said at an event on May 19.

An open question is whether booster shots against Covid-19 will be necessary. The director of the U.S. Food and Drug Administration’s Center for Biologics Evaluation and Research, Peter Marks, noted that it is possible booster shots would be necessary for fully vaccinated individuals within a year even though the Pfizer-BioNTech and Moderna vaccines are highly effective at Covid-19 prevention.

The United States administered Covid-19 vaccinations to around 600,000 children ages 12 to 15 last week after regulators cleared Pfizer’s and BioNTech’s shots for use in that age group, U.S. Centers for Disease Control and Prevention Director Rochelle Walensky said in a media call on May 18.

Moderna Inc. said on May 5 early human trial data shows that a third dose of either the company’s current Covid-19 shot or an experimental new vaccine candidate increases immunity against variants of Covid-19 first found in Brazil and South Africa.

A U.S. health advisory panel on April 14 is set to review six reported cases of rare blood clots in women who received Johnson & Johnson’s Covid-19 vaccine one day after federal regulators paused the use of the shot to assess the issue.