"The mask is your first line of defense," Kimberly Prather, a professor of atmospheric chemistry at UC San Diego's Scripps Institution of Oceanography, said during an Oct. 5 news conference about the need for clearer public health guidelines to combat the coronavirus.
Local scientists help make the case for masks and call for clarity on coronavirus transmission
"The mask is your first line of defense," Kimberly Prather, a professor of atmospheric chemistry at UC San Diego's Scripps Institution of Oceanography, said during an Oct. 5 news conference about the need for clearer public health guidelines to combat the coronavirus.