About 20 medical troops, a group that includes doctors, nurses and respiratory therapists, are heading to an overburdened hospital in Lafayette, Louisiana, according to a statement from U.S. Army North, the military's lead organization for national COVID-19 response.

The troops are expected to arrive in the state on Wednesday, a U.S. official told ABC News.

"This is the second time Department of Defense medical assets have deployed to support Louisiana during the pandemic," said Lt. Gen. Laura J. Richardson, commander of U.S. Army North. "While COVID-19 continues to challenge the community here and elsewhere in the U.S., we remain steadfast in our support of our local, state and federal partners."

The military is sending the medical service members after receiving a request for assistance from the Federal Emergency Management Agency, which itself had received a request for help from Louisiana Gov. John Bel Edwards.

-ABC News' Matthew Seyler

Two school districts in Florida were found to have violated state law by mandating masking-wearing in schools during an emergency hearing held by the Florida State Board of Education Tuesday.

Alachua County Public Schools and Broward County Public Schools were non-compliant with Florida Department of Health Emergency Rule 64DER21-12 and are now subject to punishment and the potential withholding of state funding.

More than 600 students in Alachua County have been quarantined since the start of the school year just six days ago, Dr. Carlee Simon, superintendent of Alachua County Public Schools, said during the meeting.

Superintendent of Broward County Public Schools Vickie Cartwright said school administrators were concerned about the number of cases that are happening in Broward County as the delta variant spreads, especially since there were only five pediatric ICU beds available in Broward County as of Tuesday morning.

“We argue that we are exercising our constitutional responsibilities to protect our students and staff,” Simon said. “We believe this is, in quote, reasonable and necessary to achieve a compelling state interest."

All Board of Education members present at the emergency meeting voted that both school districts were in violation of the law, which "protects parents' right to make decisions regarding masking of their children in relation to COVID-19."

Florida Gov. Ron DeSantis has issued in an that the board has the right to withhold state funding to schools that they find are "unwilling or unable to comply with the law.”

No punishment was specified for the schools during the emergency meeting.

-ABC News’ Victoria Arancio

Texas Gov. Greg Abbott not experiencing symptoms after positive COVID-19 test, he tweeted Tuesday.

Patients in one region of Texas are experiencing extraordinarily long waits for hospital beds as COVID-19 continues to spread through the state.

Patients in southeast Texas, which includes Houston and the surrounding areas, are waiting in ambulances, hallways and more holding spaces for hospital beds to free up, Houston officials announced at a press briefing Tuesday.

Of the 678 patients holding in area emergency rooms with general admission orders, 265 of them have been infected with the virus, according the Southeast Texas Regional Advisory Council.

The ratio of patients who tested positive with COVID-19 is even worse for ICU admissions. Of the 112 patients in holding area emergency rooms who need an ICU bed, 75 have the virus, according to SETRAC.

-ABC News’ Gina Sunseri

A new CDC analysis found that Pfizer and Moderna vaccine efficacy dropped "significantly" among nursing home residents from March to July, as the delta variant became the predominant strain in the United States.

Researchers analyzed weekly reports from thousands of nursing home facilities in the U.S. and found that mRNA vaccines were roughly 75% effective against preventing any infection in late winter/early spring of 2021, early in the mass vaccination rollout and prior to the emergence of the delta variant. By summer of this year, effectiveness against any infection had dropped to 53%.

Crucially, this doesn't mean vaccines aren't working for nursing home residents, but the significant drop in effectiveness from March to July may support the use of booster doses for them, according to the CDC report.

A second analysis found that the mRNA vaccines are holding up well against hospitalizations for COVID-19. The research, which was conducted across 21 U.S. hospitals, found that the Pfizer and Moderna vaccines remained between 84% and 86% effective against potential hospitalizations from March to July of this year. A third analysis, conducted in New York State, found that all three authorized vaccines remained more than 90% effective at preventing hospitalization from early May to late June.

-ABC News' Sony Salzman, Eric Strauss