In our continuing series looking at the latest medical research and news on COVID-19, Larry Mantle speaks with Dr. Sam Torbati, co-chair of the department of emergency medicine at Cedars-Sinai Medical Center.    Topics today include:  White House Covid response coordinator: Americans over 60 should get second booster.  With the rise in at-home testing, are we undercounting COVID-19 cases even more than before?   COVID hospitalizations fall to 213 in L.A. County.  California will not require COVID vaccines for children this fall.  BA.2 is spreading in the U.S. but people are over it.  FDA authorizes first breath test to detect coronavirus.  This program is made possible in part by the Corporation for Public Broadcasting, a private corporation funded by the American people.