HARTFORD — Anyone traveling into Connecticut, New York or New Jersey from three additional states — Delaware, Kansas and Oklahoma — must now self-quarantine for 14 days to help prevent the spread of COVID-19.

Tuesday's announcement means a total of 19 states now meet the criteria of having a new daily positive test rate higher than 10 per 100,000 residents or a 10% or higher positive rate over a seven-day rolling average.

Connecticut Gov. Ned Lamont, a Democrat, said Monday he believes the quarantine has been discouraging visitors from coming to the state. He noted that the number of flight cancellations at Bradley International Airport is double what officials had anticipated.

“So there are many fewer people coming from Florida, Arizona, South Carolina, now even California than there were before,” said Lamont, adding that the state of Connecticut has been warning about the quarantine on social media in Florida, Arizona and Texas with ads that have garnered more than 1 million impressions.

“So I think people know that this region, not just Connecticut, is being very strict on the quarantining,” he said. “And it’s discouraging a lot of out-of-state state visitation from those states.”

The 19 states under the advisory include Alabama, Arkansas, Arizona, California, Delaware, Florida, Georgia, Iowa, Idaho, Kansas, Louisiana, Mississippi, North Carolina, Nevada, Oklahoma, South Carolina, Tennessee, Texas and Utah.

If a 14-day quarantine is not possible, Lamont recently signed an executive order that allows visitors from the affected states to substitute a negative viral test for COVID-19 taken 72 hours before traveling to Connecticut.

In other coronavirus news:

New greeting

UConn doctors have developed something they say can help reduce the transmission of COVID-19 — a replacement for the handshake.

Dr. Cato Laurencin and Dr. Aneesah McClinton, who work at UConn Health’s Connecticut Convergence Institute for Translation in Regenerative Engineering, have created what they are calling “The Laurencin-McClinton Greeting” or LMG.

The greeting involves individuals placing a closed fist to their chest just over their heart to convey respect and then reaching forward to bump the back of their forearms.

The school has posted an instructional video showing Laurencin greeting UConn President Thomas Katsouleas.

The school, in promoting its new greeting, notes that a single handshake can transfer 124 million bacteria,