Cholera
Amoebiasis
Dysentery
Hepatitis
Lead Poisoning
Polio (Infantile Paralysis)
Typhoid Fever
Shigellosis
Should all this unfold, then I suspect that “lead poisoning” would move to #1 on the list.
Sounds like Operation Cherry Blossoms at Night
https://www.warhistoryonline.com/world-war-ii/operation-cherry-blossoms-night.html
This time the enemy is not the Japanese, it’s within.