Simple categories matching pandemic:

• illness,
• infection,
• disease,
• flu,
• influenza,
• killer,

Members with property pandemic:

• tb,
• sars,
• flu,
• tuberculosis,
• hiv_infection,
• avian_flu,
• influenza,
• smallpox,
• bird_flu,
• cancer,
• tuberculosis_tb,
• measles,
• pandemic_influenza,
• cholera,
• malaria,
• avian_influenza,
• rinderpest,
• spanish_influenza,
• hepatitis,