Virus can cause/lead to Infection. Infection is a type of Incident. Incident is related to Battle. Battle is related to Single. 
Collector is a type of Person. Chest is part of Person. Chest is related to Waist. Waist is related to Shirt. 
Virus --Causes--> Infection --IsA--> Incident <--RelatedTo--> Battle <--RelatedTo--> Single 
Collector --IsA--> Person <--PartOf-- Chest <--RelatedTo--> Waist <--RelatedTo--> Shirt 