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Anthrax
Disease Seriousness
Anthrax is a severe illness and mentioning it suggests a serious, potentially fatal situation. 
Various Forms
Anthrax can be found in different forms, often specified by 'inhalation,' 'cutaneous,' or 'gastrointestinal.' 
Not Human-Origin
Anthrax is caused by bacteria, not created by humans, though it can be a biohazard. 