COVID-19 updates: Classes in Chicago canceled for 4th day
Chicago Public Schools has been in talks with teachers over COVID-19 safety.
As the COVID-19 pandemic has swept the globe, more than 5.4 million people have died from the disease worldwide, including over 837,000 Americans, according to real-time data compiled by Johns Hopkins University's Center for Systems Science and Engineering.
About 62.5% of the population in the United States is fully vaccinated against COVID-19, according to data from the Centers for Disease Control and Prevention.
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Israel approves 4th vaccine dose for people 60 and over
Israel's Ministry of Health approved a fourth dose of COVID-19 vaccine for health care workers and people over 60 years old, Prime Minister Naftali Bennett said.
"Israel will once again be pioneering the global vaccination effort," Bennett said at a press conference in Jerusalem. "Omicron is not Delta -- it’s a different ball-game altogether."
Fourth doses will be administered four months after booster shots, Bennett said.
ABC News' Jordana Miller
COVID vaccines can cause temporary menstrual cycle changes: Study
COVID-19 vaccines can cause temporary changes to menstrual cycles, a new study from Oregon Health and Science University suggests.
Researchers looked at nearly 4,000 women who use Natural Cycles, a Food and Drug Administration-approved birth control app.
They found that some women who received COVID-19 vaccines experienced changes, with the most common being periods starting late by about one day.
However, the effects were temporary with a normal menstrual cycle returning within one or two months after getting the shot.
The team emphasized the findings do not mean COVID-19 vaccines have an impact on current or future fertility.
-ABC News' Katie Kindelan