Listed below are high-risk groups as defined by the U.S. Centers for Disease Control and Prevention (CDC) who should receive an H1N1 flu vaccine.

• Asthma
  
• Neurological and neurodevelopmental conditions [including disorders of the brain, spinal cord, peripheral nerve, and muscle such as cerebral palsy, epilepsy (seizure disorders), stroke, intellectual disability (mental retardation), moderate to severe developmental delay, muscular dystrophy or spinal cord injury]
  
• Chronic lung disease (such as chronic obstructive pulmonary disease, COPD, and cystic fibrosis
  
• Heart disease (such as congenital heart disease, congestive heart failure and coronary artery disease)
  
• Blood disorders (such as sickle cell disease)
  
• Endocrine disorders (such as diabetes mellitus)
  
• Kidney disorders
  
• Liver disorders
  
• Metabolic disorders (such as inherited metabolic disorders and mitochondrial disorders)
  
• Weakened immune system due to disease or medication (such as people with HIV or AIDS, or cancer, or those on chronic steroids)

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