Q1. Which places in an average household have the most bacteria?
Q2. What household cleaner is the most effective in killing bacteria?
Q3. What causes the immune system to be weakened?
Q4. Are there such things as diets which build up the immune system?
Q5. Which part of the human body contains the most germs?
Q6. Which place has the most germ-free air?
Q7. What affects virulence?
Q8. What can be done to reduce virulence?