> Then why didn't they spread and colonize the next day, as you have claimed they would?
They do. Armpits are smelly because the sweat glands there excrete bacterial nutrients designed to feed smelly bacteria. Aluminum compounds plug the outlet of the sweat glands, choking off the supply of nutrients. The plugs last for days.
> Once you've eliminated an area, it's going to be a while, regardless of the small amounts of bacteria on other areas.
The other areas have 1 million bacteria per square centimeter that are easily spread, and a population doubling time of around 20 minutes in a favorable area like a damp armpit. Run the numbers on geometric growth at that rate. Even if you reduce bacterial density by 99.99%, they will be back in a few hours.
They do. Armpits are smelly because the sweat glands there excrete bacterial nutrients designed to feed smelly bacteria. Aluminum compounds plug the outlet of the sweat glands, choking off the supply of nutrients. The plugs last for days.
> Once you've eliminated an area, it's going to be a while, regardless of the small amounts of bacteria on other areas.
The other areas have 1 million bacteria per square centimeter that are easily spread, and a population doubling time of around 20 minutes in a favorable area like a damp armpit. Run the numbers on geometric growth at that rate. Even if you reduce bacterial density by 99.99%, they will be back in a few hours.