* Obama says U.S. making "steady progress" on vaccine
* U.S., local governments get ready for next wave of flu
* Study suggests swine flu unlikely to become "superbug"
By Julie Steenhuysen
CHICAGO, Sept 1 (Reuters) - President Barack Obama urged Americans on Tuesday to get the H1N1 shot when it becomes available as the nation prepares for a second wave of swine flu as autumn approaches in the the Northern Hemisphere.
After a meeting with health and homeland security advisers, President Barack Obama said the United States is "making steady process on developing a safe and effective H1N1 flu vaccine and we expect a flu shot program will begin soon."
"This program will be completely voluntary but it will be strongly recommended," he said.