About 41 West Virginian patients who earlier received the Regeneron monoclonal antibody treatment instead of the Moderna vaccine ultimately got their first shot of a vaccine Thursday, the West Virginia National Guard told ABC News.

The patients were among the 44 people who were identified on Dec. 31 as receiving the wrong treatment at a vaccination clinic hosted by staff at the Boone County Health Department.

The National Guard did not say which vaccine those patients received when they got the correct shot.

Their first shots come despite recommendations by the U.S. Centers for Disease Control and Prevention that patients who receive monoclonal antibodies or convalescent plasma should defer vaccinations for at least 90 days.

-ABC News' Arielle Mitropoulos contributed to this report

Pfizer and its partner BioNTech have plans to begin offering their COVID-19 vaccine to clinical trial volunteers who received placebo by March 1, several months earlier than initially planned, STAT reported.

The FDA and its advisers had pushed hard for volunteers to remain on placebo as long as possible to gather more safety and efficacy data about the vaccines, while the companies argued that volunteers should receive the vaccines sooner for both ethical and practical reasons.

-ABC News' Eric M. Strauss

New York state saw 166 deaths Thursday -- the highest number of deaths in a single day since May 12.

On Thursday, 219,523 test results were reported to New York state, and 7.52% were positive, New York Gov. Andrew Cuomo's office reported.

There were 7,886 patient hospitalizations statewide, 1,292 patients in intensive care units and 776 intubated.

-ABC News' Joshua Hoyos

340,000 people have been vaccinated to date in Texas, out of the state's received allotment of 786,000 vaccination doses, according to data from Texas Health and Human Services.

Houston Mayor Sylvester Turner also authorized the Houston Health Department to open the city's first free COVID-19 vaccination clinic on Jan. 2. The clinic will expand vaccine access to the general public at high risk of severe illness and death from coronavirus disease, according to a statement from Texas health officials.

Texas' health department received its first allotment of 3,000 doses of the Moderna vaccine and started administering it on December 28.

The Houston Health Department will announce additional free vaccination opportunities as supply increases.

-ABC News' Gina Sunseri

The Centers for Disease Control and Prevention updated its guidelines for people with underlying health conditions planning to take a COVID-19 vaccine.

They CDC said that adults with underlying medical conditions -- who are more at risk of becoming seriously ill from COVID-19 -- can receive a vaccine against the virus as long as they have not had a severe allergic reaction to any of the ingredients in it.

The new guidelines state that people with HIV and those with weakened immune systems due to other illnesses or medication should be aware that information about the safety of COVID-19 vaccines for their group is not yet available. While people with HIV were included in clinical trials, more data is required to provide safety guidelines regarding the effects a vaccine could have on them. The same is true for people with autoimmune conditions.

People who have previously had Guillain-Barre syndrome or Bell’s palsy may receive a COVID-19 vaccine, though experts are still acquiring more data about their groups as well.

The CDC added that people should continue to follow coronavirus health measures -- such as wearing a mask and staying 6 feet away from others -- after receiving the shot, as experts have more to learn about the protection that COVID-19 vaccines provide under real-life conditions.