Here are the correct pairs:
Influenza - Vaccination
The vaccination would make your body become unsuitable environmnet for the virus to live off, so you would not be infected. The vaccination would be re-developed every two years since virus can adapt to the old one.
HIV - education
We still have not found the vaccines to prevent HIV from infecting our body. The best method of prevention would be education. We need to teach the children that HIV can be spread through unsafe sex, needle sharing, or blood transfusion.
Kidney failure - organ donation
Every individuals have 2 kidneys and we can still live if we give one of them. Usually immediate families such as parents or siblings had a suitable match for the kidney donation.
Aerobic exercises such as cardio to strengthen legs, endurance and cardiovascular health to overall do better next time.
I would say that <u>a deadly water-borne microorganism in a city's water source</u> would most quickly devastate a human population, merely because a huge number of people uses this water for some kind of a purpose.
