Possible Clues:

• Dangerous food bacterium
• Table where Yorkshire river rises poisons food
• Bacterium causing food poisoning
• Food poisoning bacterium
• Lean period in which one's caught disease
• Inclination to reverse Yorkshire river with bacterial infection
• Common pathogenic bacterium
• A threat to health -- it is real unfortunately
• Doctor tries to cut back pain and disease
• Hazard in badly kept food