WASHINGTON -- Army researchers are working to rapidly develop and test experimental vaccines to combat COVID-19, Army Secretary Ryan McCarthy said.The Army is also collaborating with the private sector and other government entities on 24 vaccine candidates, some of which are headed for human testing after having been tested on animals, he said.McCarthy conducted a Pentagon press briefing Friday to discuss the Army's efforts to prevent the spread of and find a cure for COVID-19.The Army and other partners are working to more rapidly conduct COVID-19 testing to screen the force at a higher rate, he said. Currently, testing is at a rate of 810 samples per day and plans are to increase that to more than 16,000 per day.The Army has nine medical treatment facilities with clinical laboratories certified to conduct testing, he noted.In the treatment effort, the U.S. Army Corps of Engineers is working with state governments in 13 states — and that number will reach 18 by this evening — to provide planning and concept development and increase bed space on behalf of the Federal Emergency Management Agency, he said."The Army is ready to surge additional medical support if asked," McCarthy added.As of 7 p.m. Thursday, the U.S. Army has 45 cases of COVID-19, including 21 soldiers, six civilians, eight family members and 10 contractors, he said.Force health protection plans at U.S. military installations in hard-hit Italy and South Korea have greatly reduced the number of infections that could have occurred had measures not been enforced such as modifying training activities, delaying moves, quarantining anyone suspected of having the virus, enforcing social distancing and promoting good hygiene, he said, adding that the Army is rapidly ramping up similar measures throughout the force.Recruiting stations are shutting down and recruiters are recruiting virtually, meaning through social media, he said.The Army is also moving to install virtual learning for its educational institutions like the Army War College and the U.S. Military Academy, he said.Chief of Staff of the Army Gen. James McConville, Army Corps of Engineers Lt. Gen. Todd Semonite and Army Surgeon General Lt. Gen. Scott Dingle also spoke during the press briefing.U.S. Army Guidance on CoronavirusCOVID-19 response: Secretary McCarthy hosts press conference with Gen. McConville