Plot: San Francisco: Two men have been in an accident on the Bay Bridge; A bodyguard at a nightclub has been beaten up; Another man has been beaten up in a street fight, and is struggling to breathe; An HIV+ man is evaluated after ingesting alcohol and Valium ; A woman has been slashed in the throat with a broken bottle; A 25-year-old man is suspected of a heroin overdose; A paramedic receives an accidental needle stick; A four-year-old child has sprayed herself with pepper spray.