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New swine flu strain found in 2 children

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(CBS) - A new strain of swine flu has shown up in two children in Pennsylvania and Indiana.

The virus includes a gene from the H1N1 strain that caused the 2009 global pandemic.  So far, the Centers for Disease Control and Prevention says there's no sign the virus has spread beyond these two kids.

With flu season approaching, doctors say most children need to get another flu shot even if they got one last year.  The American Academy of Pediatrics reports that immunity drops as much as 50 percent six to twelve months after vaccination.

The group says everyone six months and older should receive a flu shot.