Related Clues:

• Protected
• Unaffected
• Protected, in a way
• Protected, as from disease
• Free (from)
• Resistant
• Unable to catch, with 'to'
• Not susceptible
• Impervious
• Successfully vaccinated
• Exempt
• Resistant, in a way
• Protected by shots, perhaps
• Unlikely to be affected
• Not susceptible to, say after inoculation