Can chickens spread parasites to humans?

No, Bird Flu also known as Avian Influenza,or Avian Flu can't be spread to humans. Bird flu refers to strains of influenza that primarily affect wild and domesticated birds. In the late 1990s, a new strain of bird flu arose which was unusually severe (highly pathogenic), resulting in the deaths of hundreds of millions of birds, including poultry. Although bird flu is contagious and spreads easily among birds, it is uncommon for it to be transmitted to humans.