An indoor mask mandate has been reinstated in Savannah, Georgia, effective immediately, amid a steep rise in the daily number of COVID-19 cases, Mayor Van Johnson said.

The increase is likely due to the delta variant, relatively low vaccination rates and gatherings where people let their guard down, officials said.

"Are we effectively punishing those who did the right thing who took the vaccine?" the mayor said. "Yes, we probably are."

To those still hesitant to get the vaccine, Johnson said, "The wait and see time is over."

-ABC News’ Alexandra Faul

Orange County, Florida, which includes the city of Orlando, is in "crisis mode" as COVID-19 cases skyrocket, Orange County Mayor Jerry Demings said Monday.

The county is now seeing 1,000 new cases per day – which is what was recorded there during the highest peak in 2020, Demings said.

-ABC News’ Ben Stein

The White House will leave in place existing travel restrictions due to the surge in cases from the delta variant, a White House official confirmed to ABC News.

This news was first reported by Reuters Monday morning.

The official said the "reopening process is guided by the science and public health," adding that cases of the delta variant are rising in the U.S. and globally, mostly among the unvaccinated, and "appear likely to continue [to] increase in the weeks ahead."

-ABC News’ Justin Gomez

New data shows how rare COVID-19 breakthrough infections likely are.

With more than 156 million Americans fully vaccinated, about 153,000 symptomatic breakthrough cases are estimated to have occurred as of last week, representing approximately 0.098% of those fully vaccinated, according to an unpublished internal Centers for Disease Control and Prevention document obtained by ABC News. These estimates reflect only the adult population and do not include asymptomatic breakthrough infections.

But in Provincetown, on Massachusetts’ Cape Cod, at least 551 COVID-19 infections, many of them breakthroughs, were confirmed after the July Fourth weekend. Of the Massachusetts residents who tested positive as a result of the Provincetown cluster, 69% reported to be fully vaccinated, according to local officials.

Most people were symptomatic. Apart from three hospitalizations, symptoms from cases associated with this cluster were known to be mild and without complication, said Alex Morse, the town manager for Provincetown.

-ABC News’ Arielle Mitropoulos

In Austin, Texas, intensive care unit capacity has reached a "dire" point, the city's health department said Friday, with only 16 staffed beds available for over 2.3 million residents.

"We are running out of time and our community must act now," Austin-Travis County Health Authority Dr. Desmar Walkes said in a statement. "Our ICU capacity is reaching a critical point where the level of risk to the entire community has significantly increased, and not just to those who are needing treatment for COVID. If we fail to come together as a community now, we jeopardize the lives of loved ones who might need critical care."

The low ICU capacity is similar to the beginning of the pandemic, Austin Public Health said, noting that the number of COVID-19 patients in local ICUs increased 28% between July 23 and July 30.

Local health officials advised that partially or unvaccinated people should avoid gatherings and wear a mask during essential activities, while those who are vaccinated should limit gathering sizes and wear a mask indoors, among other measures.