A group of GOP lawmakers wants FDA to use real-world evidence from Israel and the United Kingdom to justify extending the amount of time patients can wait between getting their first and second shots of the currently authorized two-dose mRNA COVID-19 vaccines. Some health care experts believe extending the dosing regimen could allow more people to get vaccinated with the first dose and optimize vaccine supply in the United States, but National Institutes of Allergy and Infectious Diseases Director Anthony...